Category: YOGA

Heavy rains and sea level rise contribute to major flooding events that are one effect of climate change. Surging water rushing into buildings often causes immediate harms, such as drowning deaths, injuries sustained while seeking shelter or fleeing, and hypothermia after exposure to cold waters with no shelter or heat.

But long after news trucks leave and public attention moves on, flooding continues to affect communities in visible and less visible ways. Among the less visible threats is a higher risk of respiratory health problems like asthma and allergic reactions. Fortunately, you can take steps to minimize or avoid flooding, or to reduce respiratory health risks after flooding occurs.

How does flooding trigger respiratory health issues?

Flooding may bring water contaminated with toxic chemicals, heavy metals, pesticides, biotoxins, sewage, and water-borne pathogens into buildings. Afterward, some toxic contaminants remain in dried sediments left behind. When disturbed through everyday actions like walking and cleaning, this turns into microscopic airborne dust. Anything in that dried flood sediment — the toxic chemicals, the metals, the biotoxins — is now in the air you breathe into your lungs, potentially affecting your respiratory health.

Buildings needn’t be submerged during flooding to spur respiratory problems. Many homes we studied after Hurricane Ida suffered water intrusion through roofs, windows, and ventilation ducts — and some were more than 100 miles away from coastal regions that bore the brunt of the storm.

The growth of mold can also affect health

Another common hazard is mold, a fungal growth that forms and spreads on damp or decaying organic matter. Indoor mold generally grows due to extensive dampness, and signals a problem with water or moisture. Damp materials inside buildings following a flood create perfect conditions for rapid mold growth.

Mold can be found indoors and outdoors in all climates. It spreads by making tiny spores that float through the air to land in other locations. No indoor space is entirely free from mold spores, but exposure to high concentrations is linked with respiratory complications such as asthma, allergic rhinitis, and sinusitis. Thus, flooding affects respiratory health by increasing the risk of exposure to higher concentrations of mold spores outdoors and indoors.

For example, after Hurricane Katrina in New Orleans in 2005, the average outdoor concentration of mold spores in flooded areas was roughly double that of non-flooded areas, and the highest concentrations of mold spores were measured indoors. A study on the aftermath of Hurricane Katrina and the flooding in the UK in 2007 showed that water damage accelerated mold growth and respiratory allergies.

Children are especially vulnerable to health problems triggered by mold. All respiratory symptoms — including asthma, bronchitis, eye irritation, and cough — occurred more often in homes reporting mold or dampness, according to a study on the respiratory health of young children in 30 Canadian communities. Other research demonstrates that mold contributes to development of asthma in children.

What can you do to protect against the health harms of flooding?

Our research in New Orleans, LA after Hurricane Ida in 2021 identified common factors — both in housing and flooding events — with great impact on respiratory health. Preliminary results suggest two deciding factors in whether substantial indoor mold appeared were the age of a building’s roof and how many precautionary measures people took after flooding from the hurricane. The impact on respiratory health also varied with flood water height, days per week spent at home, and how many precautionary measures were taken after Ida swept through.

Informed by this and other research, we offer the following tips — some to tackle before flooding or heavy rains, and some to take afterward. While you may not be able to entirely prevent flooding from hurricanes or major storms, taking these and other steps can help.

Before seasonal storms, flooding, or heavy rains start: Protect against water intrusion

• Repair the roof, clean gutters, and seal around skylights, vent pipes, and chimneys to prevent leaks. These are some of the most vulnerable components of a building during storms and hurricanes.
• Declutter drains and empty septic tanks.
• Construct barriers and seal cracks in outer walls and around windows, to prevent heavy rain and floodwater from entering.
• Install a sump pump to drain water from the basement, and backflow valves on sewer lines to prevent water from backing up into the home.

After flooding or major rainstorms: Move quickly to reduce dampness and mold growth

The Environmental Protection Agency recommends limiting contact with flood water, which may have electrical hazards and hazardous substances, including raw sewage. Additionally:

• Minimize your stay in flooded regions (particularly after hurricanes) or buildings until they are dry and safe.
• Check building for traces of water intrusion, dampness, and mold growth immediately after flooding.
• Drain floodwater and dispose of remaining sediment.
• Remove affected porous materials. If possible, dry them outdoors under sunlight.
• Increase the ventilation rate by leaving all windows and doors open, or use a large exhaust fan to dry out the building as fast as possible.
• Use dehumidifiers in damp spaces such as basements.
• Upgrade the air filters in your HVAC system to at least MERV 13, or use portable air cleaners with HEPA filters to reduce your exposure to airborne mold spores.

What to do if you spot mold growth

• Wear a well-fitted N95 face mask, gloves, and rubber boots to clean.
• Clean and disinfect anything that has been in contact with water using soap, detergents, and/or antibacterial cleaning products.
• Dispose of moldy materials in sealed heavy-duty plastic bags.

Taking steps like these — before and after a major storm — goes a long way toward protecting your respiratory health.

Read Flooding Brings Deep Trouble in Harvard Medicine magazine to learn more about the health hazards related to floods.

About the Authors

Parham Azimi, PhD, Contributor

Dr. Parham Azimi is a research associate in the department of environmental health at the Harvard T.H. Chan School of Public Health, investigating the indoor environment’s impact on occupant health and wellness and strategies to improve … See Full Bio View all posts by Parham Azimi, PhD

Joseph Allen, DSc, MPH, CIH, Contributor

Dr. Joseph Allen is an associate professor in the department of environmental health at the Harvard T.H. Chan School of Public Health, and the director of Harvard’s Healthy Buildings Program. He is the coauthor of Healthy … See Full Bio View all posts by Joseph Allen, DSc, MPH, CIH Share

Everything is connected. You’ve probably heard that before, but it bears repeating. Below are five ways to boost both your individual health and the health of our planet — a combination that environmentalists call co-benefits.

How your health and planetary health intersect

Back in 1970, Earth Day was founded as a day of awareness about environmental issues. Never has awareness of our environment seemed more important than now. The impacts of climate change on Earth — fires, storms, floods, droughts, heat waves, rising sea levels, species extinction, and more — directly or indirectly threaten our well-being, especially for those most vulnerable. For example, air pollution from fossil fuels and wildfires contributes to lung problems and hospitalizations. Geographic and seasonal boundaries for ticks and mosquitoes, which are carriers of infectious diseases, expand as regions warm.

The concept of planetary health acknowledges that the ecosystem and our health are inextricably intertwined. Actions and events have complex downstream effects: some are expected, others are surprising, and many are likely unrecognized. While individual efforts may seem small, collectively they can move the needle — even ever so slightly — in the right direction.

Five ways to improve personal and planetary health

Adopt plant-forward eating.

This means increasing plant-based foods in your diet while minimizing meat. Making these types of choices lowers the risks of heart disease, stroke, obesity, high blood pressure, type 2 diabetes, and many cancers. Compared to meat-based meals, plant-based meals also have many beneficial effects for the planet. For example, for the same amount of protein, plant-based meals have a lower carbon footprint and use fewer natural resources like land and water.

Remember, not all plants are equal.

Plant foods also vary greatly, both in terms of their nutritional content and in their environmental impact. Learning to read labels can help you determine the nutritional value of foods. It’s a bit harder to learn about the environmental impact of specific foods, since there are regional factors. But to get a general sense, Our World in Data has a collection of eye-opening interactive graphs about various environmental impacts of different foods.

Favor active transportation.

Choose an alternative to driving such as walking, biking, or using public transportation when possible. Current health recommendations encourage adults to get 150 minutes each week of moderate-intensity physical activity, and two sessions of muscle strengthening activity. Regular physical activity improves mental health, bone health, and weight management. It also reduces risks of heart disease, some cancers, and falls in older adults. Fewer miles driven in gas-powered vehicles means cleaner air, decreased carbon emissions contributing to climate change, and less air pollution (known to cause asthma exacerbations and many other diseases).

Start where you are and work up to your level of discomfort.

Changes that work for one person may not work for another. Maybe you will pledge to eat one vegan meal each week, or maybe you will pledge to limit beef to once a week. Maybe you will try out taking the bus to work, or maybe you will bike to work when it’s not winter. Set goals for yourself that are achievable but are also a challenge.

Talk about it.

It might feel as though these actions are small, and it might feel daunting for any one individual trying to make a difference. Sharing your thoughts about what matters to you and about what you are doing might make you feel less isolated and help build community. Building community contributes to well-being and resilience.

Plus, if you share your pledges and aims with one person, and that person does the same, then your actions are amplified. Who knows, maybe one of those folks along the way might be the employee who decides what our children eat from school menus, or a city planner for pedestrian walkways and bike lanes!

About the Author

Wynne Armand, MD, Contributor

Dr. Wynne Armand is a physician at Massachusetts General Hospital (MGH), where she provides primary care; an assistant professor in medicine at Harvard Medical School; and associate director of the MGH Center for the Environment and … See Full Bio View all posts by Wynne Armand, MD Share

If you’ve been on TikTok lately, you know it’s hard to avoid countless influencers touting a concept called sleepmaxxing. Their posts provide tips and tricks to get longer, better, and more restorative sleep. And why not? Sleep is considered a pillar of good health and is related to everything from brain health to cardiovascular health, and even diabetes.

But what exactly is sleepmaxxing? And how likely is it to deliver on claims of amped-up energy, a boost to the immune system, reducing stress levels, and improving your mood?

What is sleepmaxxing?

Depending on which social media platform you happen to be looking at, the recommended strategies for maximizing sleep differ. Tips include:

• taping your mouth shut while sleeping
• not drinking anything during the two hours before bedtime
• a cold room temperature
• a dark bedroom
• using a white noise machine
• not setting a morning alarm
• showering one hour before bedtime
• eliminating caffeine
• eating kiwis before going to bed
• taking magnesium and melatonin
• using weighted blankets
• getting 30 minutes of sunlight every day
• meditating daily for 30 minutes.

Does any research support sleepmaxxing?

A thorough search through PubMed, PsycNet, and Google Scholar reveals zero results for the terms “sleepmaxx” and “sleepmaxxing.” But wait — this certainly doesn’t mean that some influencer-recommended strategies are not evidence-based, just that the concept of sleepmaxxing, as a defined package, has not been scientifically studied. But yes, some of the strategies — including one uncomfortable, though popular, choice — lack evidence.

Can mouth-taping improve your sleep?

TikTok users have claimed that taping your mouth while you sleep has benefits, such as reducing snoring and improving bad breath. A team from the department of otolaryngology at George Washington University was prompted by all of the social media buzz on the topic to review research on the impact of nocturnal mouth taping. Spoiler alert: the authors note that most TikTok mouth-taping claims aren’t supported by research.

If you do snore, it’s important to discuss this with your medical team. Even if taping your mouth reduces your snoring, it can’t effectively treat a potential underlying cause of the snoring, such as allergies, asthma, or sleep apnea.

Sleepmaxxing or basic sleep hygiene?

Many strategies recommended by sleepmaxxers are essentially what sleep experts prescribe as good sleep hygiene, which has plenty of research backing its value. Common components of sleep hygiene are decreasing caffeine and alcohol consumption, increasing physical activity, sleep timing, reducing evening light exposure, limiting daytime naps, and having a cool bedroom.

While tips like these help many people enjoy restful sleep, those who have an insomnia disorder will need more help, as described below.

Melatonin, early bedtime, weighted blankets, and — kiwi fruit?

Other strategies suggested by sleepmaxxers are based on limited scientific data. For example:

• Taking melatonin is recommended by the American Academy of Sleep Medicine to treat circadian rhythm disorders such as jet lag. But it’s not recommended for insufficient sleep, poor sleep quality, or difficulty with falling asleep or staying asleep.
• Is it healthier to be asleep by 10 p.m.? One video that garnered more than a million views claims it is. While it is important to maximize morning sunlight exposure and minimize evening light exposure to regulate circadian rhythms, there is such variability in how much sleep someone requires and individual chronotypes (not to mention varying personal and professional responsibilities!) that it is difficult to state there is an ideal bedtime for everyone.
• While intriguing research has been done on weighted blankets, there is no convincing evidence that they are truly effective for the general adult population.
• Overall, it’s important to be cautious about the impact of the placebo effect on how someone sleeps. An analysis of more than 30 studies showed that roughly 64% of the drug response for a sleep medication in insomnia patients could be due to the placebo effect. A key takeaway is that studies that are not randomized controlled trials — such as this small study on 24 people suggesting that kiwi fruit may improve sleep — should be interpreted with a grain of salt.

Could you have orthosomnia?

The expectation of flawless sleep, night in and night out, is an unrealistic goal. Orthosomnia is a term that describes an unhealthy pursuit of perfect sleep. The pressure to get perfect sleep is embedded in the sleepmaxxing culture.

With more and more people able to access daily data about their sleep and other health metrics through consumer wearables, even a person who is objectively sleeping well can become unnecessarily concerned with optimizing their sleep. While prioritizing restful sleep is commendable, setting perfection as your goal is problematic. Even good sleepers vary from night to night, experiencing less than desirable sleep a couple of times per week.

It is also noteworthy that some of the most widely viewed recommendations on TikTok are not supported by scientific evidence.

Do you really need to fix your sleep?

A good first step is to understand whether or not there is anything that you need to fix! Consider tracking your sleep for a few weeks using a sleep diary, and pair this data with a consumer wearable (such as a Fitbit or Apple Watch). Both imperfectly capture sleep data when compared to the gold-standard tool sleep experts use (polysomnography, or a sleep study). However, combining the information can give you a reasonable assessment of your sleep status.

Regularly getting restful sleep can indeed boost health and mood. And all of us can benefit from following basic sleep hygiene tips. But if it takes you 30 minutes or more to fall asleep, or if you are up for 30 minutes or more in the middle of the night, and this happens three or more times per week, then consider reaching out to your health care team to seek further evaluation.

There are effective, nonmedication treatments that are proven to help you sleep better. One example is cognitive behavioral therapy for insomnia, which can dramatically improve insomnia symptoms in a matter of weeks.

Want to learn more about cognitive behavioral therapy for insomnia? Watch this video from the Division of Sleep Medicine at Harvard Medical School with Eric Zhou describing how it works.

About the Author

Eric Zhou, PhD, Contributor

Eric Zhou, PhD, is an assistant professor of psychiatry at Harvard Medical School. He has been invited to speak internationally about sleep health in both pediatric and adult populations, including those with chronic illnesses. His research … See Full Bio View all posts by Eric Zhou, PhD Share

By the time boys are 8 or 10, they’re steeped in Marvel action heroes with bulging, oversized muscles and rock-hard abs. By adolescence, they’re deluged with social media streams of bulked-up male bodies.

The underlying messages about power and worth prompt many boys to worry and wonder about how to measure up. Sometimes, negative thoughts and concerns even interfere with daily life, a mental health issue known body dysmorphic disorder, or body dysmorphia. The most common form of this in boys is muscle dysmorphia.

What is muscle dysmorphia?

Muscle dysmorphia is marked by preoccupation with a muscular and lean physique. While the more extreme behaviors that define this disorder appear only in a small percentage of boys and young men, it may color the mindset of many more.

Nearly a quarter of boys and young men engage in some type of muscle-building behaviors. “About 60% of young boys in the United States mention changing their diet to become more muscular,” says Dr. Gabriela Vargas, director of the Young Men’s Health website at Boston Children’s Hospital. “While that may not meet the diagnostic criteria of muscle dysmorphia disorder, it’s impacting a lot of young men.”

“There’s a social norm that equates muscularity with masculinity,” Dr. Vargas adds. “Even Halloween costumes for 4- and 5-year-old boys now have padding for six-pack abs. There’s constant messaging that this is what their bodies should look like.”

Does body dysmorphic disorder differ in boys and girls?

Long believed to be the domain of girls, body dysmorphia can take the form of eating disorders such as anorexia or bulimia. Technically, muscle dysmorphia is not an eating disorder. But it is far more pervasive in males — and insidious.

“The common notion is that body dysmorphia just affects girls and isn’t a male issue,” Dr. Vargas says. “Because of that, these unhealthy behaviors in boys often go overlooked.”

What are the signs of body dysmorphia in boys?

Parents may have a tough time discerning whether their son is merely being a teen or veering into dangerous territory. Dr. Vargas advises parents to look for these red flags:

• Marked change in physical routines, such as going from working out once a day to spending hours working out every day.
• Following regimented workouts or meals, including limiting the foods they’re eating or concentrating heavily on high-protein options.
• Disrupting normal activities, such as spending time with friends, to work out instead.
• Obsessively taking photos of their muscles or abdomen to track “improvement.”
• Weighing himself multiple times a day.
• Dressing to highlight a more muscular physique, or wearing baggier clothes to hide their physique because they don’t think it’s good enough.

“Nearly everyone has been on a diet,” Dr. Vargas says. “The difference with this is persistence — they don’t just try it for a week and then decide it’s not for them. These boys are doing this for weeks to months, and they’re not flexible in changing their behaviors.”

What are the health dangers of muscle dysmorphia in boys?

Extreme behaviors can pose physical and mental health risks.

For example, unregulated protein powders and supplements boys turn to in hopes of quickly bulking up muscles may be adulterated with stimulants or even anabolic steroids. “With that comes an increased risk of stroke, heart palpitations, high blood pressure, and liver injury,” notes Dr. Vargas.

Some boys also attempt to gain muscle through a “bulk and cut” regimen, with periods of rapid weight gain followed by periods of extreme calorie limitation. This can affect long-term muscle and bone development and lead to irregular heartbeat and lower testosterone levels.

“Even in a best-case scenario, eating too much protein can lead to a lot of intestinal distress, such as diarrhea, or to kidney injury, since our kidneys are not meant to filter out excessive amounts of protein,” Dr. Vargas says.

The psychological fallout can also be dramatic. Depression and suicidal thoughts are more common in people who are malnourished, which may occur when boys drastically cut calories or neglect entire food groups. Additionally, as they try to achieve unrealistic ideals, they may constantly feel like they’re not good enough.

How can parents encourage a healthy body image in boys?

These tips can help:

• Gather for family meals. Schedules can be tricky. Yet considerable research shows physical and mental health benefits flow from sitting down together for meals, including a greater likelihood of children being an appropriate weight for their body type.
• Don’t comment on body shape or size. “It’s a lot easier said than done, but this means your own body, your child’s, or others in the community,” says Dr. Vargas.
• Frame nutrition and exercise as meaningful for health. When you talk with your son about what you eat or your exercise routine, don’t tie hoped-for results to body shape or size.
• Communicate openly. “If your son says he wants to exercise more or increase his protein intake, ask why — for his overall health, or a specific body ideal?”
• Don’t buy protein supplements. It’s harder for boys to obtain them when parents won’t allow them in the house. “One alternative is to talk with your son’s primary care doctor or a dietitian, who can be a great resource on how to get protein through regular foods,” Dr. Vargas says.

About the Author

Maureen Salamon, Executive Editor, Harvard Women's Health Watch

Maureen Salamon is executive editor of Harvard Women’s Health Watch. She began her career as a newspaper reporter and later covered health and medicine for a wide variety of websites, magazines, and hospitals. Her work has … See Full Bio View all posts by Maureen Salamon

About the Reviewer

Howard E. LeWine, MD, Chief Medical Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

Dr. Howard LeWine is a practicing internist at Brigham and Women’s Hospital in Boston, Chief Medical Editor at Harvard Health Publishing, and editor in chief of Harvard Men’s Health Watch. See Full Bio View all posts by Howard E. LeWine, MD Share

Has the recent news about measles outbreaks in the US surprised you? Didn’t it seem like we were done with measles?

In the US, widespread vaccination halted the ongoing spread of measles more than 20 years ago, a major public health achievement. Before an effective vaccine was developed in the 1960s, nearly every child in the US got measles. Complications like measles-related pneumonia or hearing loss were common, and 400 to 500 people died each year.

As I write this, there have been 1,197 confirmed cases in 34 states, mostly among children. The biggest outbreak is in west Texas, where 96 people have been hospitalized and two unvaccinated school-age children recently died, the first measles deaths in the US since 2015. Officials in New Mexico have also reported a measles-related death.

Can we prevent these tragedies?

Measles outbreaks are highly preventable. It’s estimated that when 95% of people in a community are vaccinated, both those individuals and others in their community are protected against measles.

But nationally, measles vaccination rates among school-age kids fell from 95% in 2019 to 92% in 2023. Within Texas, the kindergarten vaccination rates have dipped below 95% in about half of all state counties. In the community at the center of the west Texas outbreak, the reported rate is 82%. Declining vaccination rates are common in other parts of the US, too, and that leaves many people vulnerable to measles infections.

Only 3% of the recent cases in the US involved people known to be fully vaccinated. The rest were either unvaccinated or had unknown vaccine status (95%), or they had received only one of the two vaccine doses (2%).

What to know about measles

As measles outbreaks occur within more communities, it’s important to understand why this happens — and how to stop it. Here are seven things to know about measles.

The measles virus is highly contagious

Several communities have suffered outbreaks in recent years. The measles virus readily spreads from person to person through the air we breathe. It can linger in the air for hours after a sneeze or cough. Estimates suggest nine out of 10 nonimmune people exposed to measles will become infected. Measles is far more contagious than the flu, COVID-19, or even Ebola.

Early diagnosis is challenging

It usually takes seven to 14 days for symptoms to show up once a person gets infected. Common early symptoms — fever, cough, runny nose — are similar to other viral infections such as colds or flu. A few days into the illness, painless, tiny white spots in the mouth (called Koplik spots) appear. But they’re easy to miss, and are absent in many cases. A day or two later, a distinctive skin rash develops.

Unfortunately, a person with measles is highly contagious for days before the Koplik spots or skin rash appear. Very often, others have been exposed by the time measles is diagnosed and precautions are taken.

Measles can be serious and even fatal

Measles is not just another cold. A host of complications can develop, including

• brain inflammation (encephalitis), which can lead to seizures, hearing loss, or intellectual disability
• pneumonia
• eye inflammation (and occasionally, vision loss)
• poor pregnancy outcomes, such as miscarriage
• subacute sclerosing panencephalitis (SSPE), a rare and lethal disease of the brain that can develop years after the initial measles infection.

Complications are most common among children under age 5, adults over age 20, pregnant women, and people with an impaired immune system. Measles is fatal in up to three of every 1,000 cases.

During the latest outbreaks, 144 cases — about one in eight — have required hospitalization.

Getting measles may suppress your immune system

When you get sick from a viral or bacterial infection, antibodies created by your immune system will later recognize and help mount a defense against these intruders. In 2019, a study at Harvard Medical School (HMS) found that the measles virus may wipe out up to three-quarters of antibodies protecting against viruses or bacteria that a child was previously immune to — anything from strains of the flu to herpesvirus to bacteria that cause pneumonia and skin infections.

“If your child gets the measles and then gets pneumonia two years later, you wouldn’t necessarily tie the two together. The symptoms of measles itself may be only the tip of the iceberg,” said the study’s first author, Dr. Michael Mina, who was a postdoctoral researcher in the laboratory of geneticist Stephen Elledge at HMS and Brigham and Women’s Hospital at the time of the study.

In this video, Mina and Elledge discuss their findings.

Vaccination is highly effective

Two doses of the current vaccine provide 97% protection — much higher than most other vaccines.  Rarely, a person gets measles despite being fully vaccinated. When that happens, the disease tends to be milder and less likely to spread to others.

The measles vaccine is safe

 The safety profile of the measles vaccine is excellent. Common side effects include temporary soreness in the arm, low-grade fever, and muscle pain, as is true for most vaccinations. A suggestion that measles or other vaccines cause autism has been convincingly discredited. However, this often-repeated misinformation has contributed to significant vaccine hesitancy and falling rates of vaccination.

Ways to protect yourself from measles infection

• Vaccination. Usually, children are given the first dose around age 1 and the second between ages 4 and 6 as part of the Measles-Mumps-Rubella (MMR) vaccine. If a child — or adult — hasn’t been vaccinated, they can have these doses later.

  If you were born after 1957 and received a measles vaccination before 1968, consider getting revaccinated or tested for measles antibodies (see below). The vaccine given before 1968 was less effective than later versions. And before 1957, most people became immune after having measles, although this immunity can wane.

• Isolation. To limit spread, everyone diagnosed with measles and anyone who might be infected should avoid close contact with others until four days after the rash resolves.
• Mask-wearing by people with measles can help prevent spread to others. Household members or other close contacts should also wear a mask to avoid getting it.
• Frequent handwashing helps keep the virus from spreading.
• Testing. If you aren’t sure about your measles vaccination history or whether you may be vulnerable to infection, consider having a blood test to find out if you’re immune to measles. Memories about past vaccinations can be unreliable, especially if decades have gone by, and immunity can wane.
• Pre-travel planning. If you are headed to a place where measles is common, make sure you are up to date with vaccinations.

The bottom line

While news about measles in recent months may have been a surprise, it’s also alarming. Experts warn that the number of cases (and possibly deaths) are likely to increase. And due to falling vaccination rates, outbreaks are bound to keep occurring. One study estimates that between nine and 15 million children in the US could be susceptible to measles.

But there’s also good news: we know that measles outbreaks can be contained and the disease itself can be eliminated. Learn how to protect yourself and your family. Engage respectfully with people who are vaccine hesitant: share what you’ve learned from reliable sources about the disease, especially about the well-established safety of vaccination.

About the Author

Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD Share

Ever wonder if every medical test or treatment you've taken was truly necessary? Or are you inclined to get every bit of health care you can? Maybe you feel good about getting the most out of your health insurance. Perhaps a neighborhood imaging center is advertising discounted screening tests, your employer offers health screens as a perk, or you're intrigued by ads touting supplements for a seemingly endless number of conditions.

But keep in mind: just because you could get a particular test or treatment or take a supplement doesn't mean you should. One study suggests that as much as 20% of all health care in the US is unneeded. In short: when it comes to health care, more is not always better.

Isn't it better to be proactive about your health?

We're all taught that knowledge is power. So it might seem reasonable to want to know as much as possible about how your body is working. And isn't it better to take action before there's a problem rather than waiting for one to develop? What's the harm of erring on the side of more rather than less?

The truth is that knowledge is not always power: if the information is irrelevant to your specific situation, redundant, or inaccurate, the knowledge gained through unnecessary health care can be unhelpful or even harmful. Unnecessary tests, treatments, and supplements come with risks, even when they seem harmless. And, of course, unnecessary care is not free — even if you're not paying a cent out of pocket, it drives up costs across health systems.

Screening tests, wellness strategies, and treatments to reconsider

Recommended screening tests, treatments, and supplements can be essential to good health. But when risks of harm outweigh benefits — or if proof of any benefit is lacking — think twice. Save your time, money, and effort for health care that is focused on the most important health threats and backed by evidence.

Cancer screening: When to stop?

Screening tests for some cancers are routinely recommended and can be lifesaving. But there's a reason they come with a recommended stop age. For instance, guidelines recommend that a person at average risk of colorectal cancer with previously normal colonoscopies stop having them once they turn 75. Similar limits apply to Pap smears (age 65) and mammograms (age 75). Studies suggest that beyond those ages, there is little benefit to continuing these screens.

Watch out for wellness marketing

Dietary supplements are a multibillion-dollar industry. And a whopping 70% or more of US adults take at least one, such as vitamin D, fish oil, or a multivitamin. People often consider them as insurance in case vital elements are missing from their diet, or they believe supplements can prevent dementia, heart disease, or another condition.

Yet little evidence supports a benefit of routine supplement use for everyone. While recent studies suggest a daily multivitamin might slow cognitive decline in older adults, there's no medical consensus that everyone should be taking a multivitamin. Fish oil (omega-3) supplements haven't proven to be as healthful as simply eating servings of fatty fish and other seafood low in toxic chemicals like mercury and PCBs. And the benefits of routinely taking vitamin D supplements remain unproven as well.

It's worth emphasizing that dietary supplements clearly provide significant benefit for some people, and may be recommended by your doctor accordingly. For example, if you have a vitamin or mineral deficiency or a condition like age-related macular degeneration, good evidence supports taking specific supplements.

Reconsider daily aspirin

Who should be taking low-dose aspirin regularly? Recommendations have changed in recent years, so this is worth revisiting with your health care team.

• Older recommendations favored daily low-dose aspirin to help prevent cardiovascular disease, including first instances of heart attack and stroke.
• New recommendations favor low-dose aspirin for people who've already experienced a heart attack, stroke, or other cardiovascular disease. Adults ages 40 to 59 who are at a high risk for these conditions and low risk for bleeding also may consider it.

Yet according to a recent study, nearly one-third of adults 60 and older without past cardiovascular disease take aspirin, despite evidence that it provides little benefit for those at average or low risk. Aspirin can cause stomach bleeding and raise risk for a certain type of stroke.

Weigh in on prostate cancer screening

Men hear about prostate cancer often. It's common, and the second leading cause of cancer deaths among men. But PSA blood tests and rectal exams to identify evidence of cancer in the prostate are no longer routinely recommended for men ages 55 to 69 by the United States Preventative Services Task Force.

The reason? Studies suggest that performing these tests does not reliably reduce suffering or prolong life. Nor do possible benefits offset downsides like false positives (test results that are abnormal despite the absence of cancer). That can lead to additional testing, some of which is invasive.

Current guidelines suggest making a shared decision with your doctor about whether to have PSA testing after reviewing the pros and cons. For men over age 70, no screening is recommended. Despite this, millions of men have PSA tests and rectal examinations routinely.

Not everyone needs heart tests

There are now more ways than ever to evaluate the health of your heart. But none are routinely recommended if you're at low risk and have no signs or symptoms of cardiovascular disease. That's right: in the absence of symptoms or a high risk of cardiovascular disease, it's generally safe to skip EKGs, stress tests, and other cardiac tests.

Yet many people have these tests as part of their routine care. Why is this a problem? Having these tests without a compelling reason comes with risks, especially false positive results that can lead to invasive testing and unneeded treatment.

Four more reasons to avoid unnecessary care

Besides the concerns mentioned already, there are other reasons to avoid unnecessary care, including:

• The discomfort or complications of testing. If you're needle-phobic, getting a blood test is a big deal. And while complications of noninvasive testing are rare (such as a skin infection from a blood test), they can occur.
• The anxiety associated with waiting to find out test results
• False reassurance that comes with false negatives (results that are normal or nearly so, suggesting no disease when disease is actually present)
• All treatments have side effects. Even minor reactions — like occasional nausea or constipation — seem unacceptable if there's no reason to expect benefit from treatment.

The bottom line

You may believe your doctor wants you to continue with your current schedule of tests and treatments, while they might think this is your preference! It's worth discussing if you haven't already, especially if you suspect you may be taking pills or getting tests you don't truly need.

If your doctor says you can safely skip certain tests, treatments, and supplements, it doesn't mean that he or she is neglecting your health or that you don't deserve great health care! It's likely that the balance of risks and benefits simply doesn't support doing these things.

Less unnecessary care could free up resources for those who need it most. And it could save you time, money, and unnecessary risks or side effects, thus improving your health. It's a good example of how less can truly be more.

About the Author

Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD Share

It’s fairly common for a medical treatment to cause side effects: think headache, upset stomach, sleepiness, and occasionally more severe side effects. Far more rarely, a side effect provides an unexpected benefit. This might be the case for the shingles vaccine.

Shingles is a painful, blistering skin rash caused by the varicella zoster virus responsible for chickenpox. The virus lies dormant in nerve tissue and can reactivate to cause shingles in anyone who has had chickenpox in the past. A vaccine to prevent shingles is recommended for adults ages 50 and older, and for people 19 and older who have an impaired immune system.

While we know the shingles vaccine is effective at preventing shingles, evidence is mounting that it might also reduce the risk of dementia. Yes, a vaccination to prevent shingles may lessen your risk of dementia.

Dementia is on the rise

Dementia is a devastating condition for those affected and their families. Currently, an estimated nine million people in the US have dementia. The number is expected to double by 2060, primarily because of the aging population. In most cases, no highly effective treatments are available. An effective preventive measure could have an enormous impact, especially if it’s safe, inexpensive, and already available.

Can shingles vaccination prevent dementia?

Some (though not all) studies have found that having shingles increases your risk of dementia in the future. And that’s led researchers to explore the possibility that preventing shingles through vaccination might reduce dementia risk.

Several studies suggest this is true. For example:

• A study of more than 300,000 adults found that among those 70 and older, dementia was less common among those who had received shingles vaccination than among those who did not.
• A study of more than 200,000 older adults compared rates of dementia between those receiving a newer (recombinant) shingles vaccine and those who had an older (live) vaccine that is no longer approved in the US. Researchers found that the risk of dementia was lower six years after receiving either vaccine. But the effect was larger for the newer vaccine: those given the recombinant vaccine spent more time living dementia-free (164 days longer) compared with those given the older vaccine.

What is a natural experiment?

Perhaps the best evidence suggesting that shingles vaccination prevents dementia comes from a natural experiment recently published in the journal Nature.

A natural experiment takes advantage of real-world circumstances by dividing people into an exposed group and an unexposed group and then comparing specific outcomes.

• Examples of exposures might be an illness (like the COVID pandemic), a policy (like a smoking ban in one state), or a vaccination (like the shingles vaccine).
• Outcomes might include virtual versus in-person learning during the pandemic, smoking-related illnesses in a state with a smoking ban compared to a state without that ban, or dementia rates among people who did or didn’t receive a vaccine.

Natural experiment studies bypass the challenges of having to recruit hundreds or thousands of study subjects who might differ from one another in important ways, or who might alter their behavior because they know they’re in a study. The results can be even more valuable than — and as credible as — standard randomized trials.

What did this natural experiment study look at?

In 2013, Wales made the shingles vaccination available to individuals based on their date of birth: anyone born after September 2, 1933, was eligible, while anyone born before that date was not. Researchers took this opportunity to analyze health records of nearly 300,000 people: half were two weeks older than the cutoff date and half were two weeks younger. The study looked at whether people developed dementia over a seven-year period.

Researchers found that compared to those who didn’t get the shingles vaccination, those who received it

• developed shingles less often
• were 3.5% less likely to develop dementia over seven years (a 20% reduction)
• were more likely to be protected from dementia if female.

A study of this type cannot prove that shingles vaccination prevents dementia. But along with the studies cited above, there’s a strong suggestion that it does. We’ll need additional studies to confirm the benefit. We also want to understand other details of the vaccine’s effect, such as whether protection applies more to some types of dementia (such as Alzheimer’s disease) than others, and whether the effect of vaccination changes over time.

Why might the shingles vaccine prevent dementia?

With any unexpected finding in science, it’s a good idea to ask whether there is a reasonable explanation behind it. Scientists call this biologic plausibility. In general, the more plausible a result is, the more likely it is to hold up in later research.

In this case, several lines of reasoning explain how a shingles vaccine might reduce the risk of dementia, including:

• Reduced inflammation: Preventing shingles may prevent harmful inflammation in the body, especially in the nervous system.
• Impact on immune function: Vaccination might alter immune function in a way that protects against dementia.
• Reducing stroke risk: Some evidence shows that shingles may increase the risk of stroke. A stroke can contribute to or cause dementia, so perhaps vaccination leads to less dementia by reducing shingles-related strokes.

The observation that women had more protection from dementia than men after shingles vaccination is unexplained. It’s possible that the immune response to vaccination is different in women, or that dementia develops differently in women compared with men.

The bottom line

All of us can take steps to lower dementia risk, mostly through healthy behaviors such as being active regularly and choosing a healthy diet. Evidence is mounting that shingles vaccination should be added to the list. It’s a story worth following. Future studies of the shingles vaccine could even provide insights into how dementia develops, and how to better prevent and treat it.

Until then, get your shingles vaccination if you’re eligible for it. It can prevent painful episodes of shingles — and may do much more.

About the Author

Robert H. Shmerling, MD, Senior Faculty Editor, Harvard Health Publishing; Editorial Advisory Board Member, Harvard Health Publishing

Dr. Robert H. Shmerling is the former clinical chief of the division of rheumatology at Beth Israel Deaconess Medical Center (BIDMC), and is a current member of the corresponding faculty in medicine at Harvard Medical School. … See Full Bio View all posts by Robert H. Shmerling, MD Share

School vacation coming up? Wondering how to spend that time? Given how tiring holidays can be — especially for parents who are working — it’s understandable why children are often allowed to spend hours with the TV, tablet, or video games. After all, happy, quiet kids make for happy parents who can finally get stuff done — or relax.

Except kids are spending way too much time in front of screens. According to the American Academy of Child and Adolescent Psychiatry, kids ages 8 to 12 are spending four to six hours a day watching or using screens — and tweens and teens are spending nine hours.

Given how enticing devices and social media can be, those numbers can easily go higher during unscheduled times like weekends and school vacation. That’s why it’s good to be proactive and come up with other activities. Below are some ideas for parents and caregivers to try. These are mostly good for kids through elementary school, but tweens and teens may enjoy some of them too.

Spending time off the screen

Go outside. This sounds obvious, but spending time outdoors is something kids do less than they used to — and it can be really fun. If you have a yard, go out into it and play hide-and-seek or build a fort from snow or anything else that’s around. If you don’t have a yard, go to a local park or just go for a walk. A scavenger hunt up and down the block or game of I Spy may be a good enticement.

Go to the library. Do this early on in vacation, so that your child has lots of books, puzzles, and games to pass the time. Check out as many as they allow and you can carry. Ask if a Library of Things is available at a branch near you: crafts, tools, musical instruments, birding kits, telescopes — even metal detectors may be checked out for free.

Build a fort in the living room. Use blankets or sheets over chairs; if you have a small tent, set it up. Bring in pillows, sleeping bags, and flashlights; let the kids sleep in it at night. Let it stay up all vacation.

Build a city in the living room. Use blocks, Legos, boxes (or anything else), and add roads, cars, people, animals, trains, and other toys. Let it stay up all vacation, and make it bigger every day.

Getting creative off the screen

Get creative. Go to the craft store and stock up on inexpensive supplies. Buy things like poster board, huge pieces of paper (you could use those for your city, too, to make parks, roads, and parking lots), paints, and markers. You can make a paper mural, a comic book, a story, posters, or whatever catches your child’s imagination. If you know how to knit or sew, think about teaching your child or making a simple project together.  Play music while you create.

Read out loud. There are so many books that are fun to read aloud. When my children were younger, we read the Harry Potter series out loud, as well as the Chronicles of Narnia and books by E.B. White and Roald Dahl. Act out the voices. Have some fun.

Have a puppet show. If you don’t have puppets, you can make some with socks — or you can hold up dolls or action figures and do the talking for them. You can make a makeshift stage by cutting out the back of a box and taping cloth (like a pillowcase) to fall over the front.

Get out the games. There are so many that work across the ages, like checkers, chess, Uno, Connect 4, Sorry, Twister, Clue, Scrabble, or Monopoly. We forget how much fun these can be.

Bake. You don’t have to get fancy — it’s fine to use mixes or pre-made cookie dough. There’s nothing better than baked goods straight from the oven, and adding frosting and decorations makes it even more fun. Turn on music and dance while things bake.

While parents or caregivers need to be involved with some of these activities (like the ones involving the oven, or reading out loud), kids can do many of them independently once you have it started. Which, really, is what children need: time to use their imagination and just play.

But you just may find that once you have things started, you'll want to play, too.

About the Author

Claire McCarthy, MD, Senior Faculty Editor, Harvard Health Publishing

Claire McCarthy, MD, is a primary care pediatrician at Boston Children’s Hospital, and an assistant professor of pediatrics at Harvard Medical School. In addition to being a senior faculty editor for Harvard Health Publishing, Dr. McCarthy … See Full Bio View all posts by Claire McCarthy, MD Share