Harvard Health Blog

It's fairly common for a medical treatment to cause side effects — but far more rarely, a side effect provides an unexpected benefit. This might be the case for the shingles vaccine, as evidence is mounting that it might also reduce the risk of dementia.

Long-term research found that higher consumption of butter increases mortality risk, while higher consumption of plant-based oil lowers it. And substituting certain plant oils for butter might help people live longer. What's a butter lover to do?

Our health is intertwined with the health of planet Earth, and the impacts of climate change threaten our well-being. Collectively taking small steps like eating more plant-forward meals, using bikes or public transit, and even sharing our pledges can help move the needle in a positive direction.

Monitoring daily step count can encourage people to be more active. When it comes to assessing fitness or risk for major illnesses, though, is a new measurement that combines both average steps and heart rate better?

Marketed as a natural remedy for an enlarged prostate, saw palmetto is a top-selling dietary supplement. By one estimate, more than a third of all US adults who take supplements use saw palmetto. But experts at Harvard say men should view its supposed benefits for prostate health skeptically.

Flooding due to major storms or heavy rains can harm lung health, both from toxic contaminants that end up in the air and from the growth of mold caused by dampness. Taking steps to prevent flooding when possible and moving quickly to reduce health risks if flooding occurs can help protect your family's health.

While medical knowledge on celiac disease has evolved over the past few decades, there are still aspects that remain poorly understood. Perhaps not surprisingly, misconceptions are widespread among the general public.

The troubling symptoms of prostatitis, or inflammation of the prostate, accounts for roughly two million doctor visits every year. Fortunately, research advances are leading to some encouraging developments for men suffering from this condition.

Problems with attention and focus, impulsivity, and constant motion are possible symptoms of ADHD.

If you've been cocooning due to winter's cold, who can blame you? But lack of activity isn't good for body or mind during any season. Any day is a good day to start exercising, but if you aren't sure how to start, or if you have an obstacle to overcome, read on.

Just because you can get a particular test or treatment or take a supplement doesn't mean you should. One study suggests as much as 20% of all health care in the US is unneeded. Skipping unnecessary care might actually improve your health, while saving time and money.

Wondering how to occupy your children during school break? Skip the screens and try these low-tech physical and creative pursuits.

In the US, widespread vaccination halted the ongoing spread of measles more than 20 years ago, but recent outbreaks have flared in over 20 US states, leading to hospitalizations and at least two deaths. Measles is highly preventable — here's what you need to know.

Sleep is a key pillar of health, and countless influencers on social media are touting a concept called sleepmaxxing. But what exactly is it? 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?

Looking after a loved one who has prostate cancer can be overwhelming. Caregivers play crucial roles in supporting a patient's physical and psychological well-being. But what does that entail? Here's what to know about effective communication, day-to-day support, and taking care of yourself.

February 14th is more than Valentine's Day –– it's also National Donor Day, when health organizations sponsor sign-ups for organ and tissue donation. For those in need, such a donation can be life-changing — or lifesaving. If you wonder what can be donated or how, read on.

Muscle dysmorphia is a preoccupation with a muscular and lean physique that is more pervasive in boys. Learn the signs of body dysmorphia as well as ways to encourage positive body image.

Our understanding of how chronic inflammation can impair health has expanded dramatically in recent years, causing some people to wonder if there is a test to identify it, and if they should have it. There are several tests that can detect inflammation, and they are useful in certain situations, but not universally.

Resilience is a psychological response that helps you adapt to life's difficulties and seek a path forward through challenges. While everyone has the ability to be resilient, life stresses can take a toll on you. It's possible to cultivate resilience — but how?

For millions of people, alcohol is a regular part of their lives. But there are many downsides to drinking — some familiar, others less well appreciated. And concerns about the risks of even moderate drinking are on the rise.

Most men over 50 will develop an enlarged prostate. Many different therapies are available, including medications and various types of surgery. Aquablation is gaining in popularity, and a recent study showed that improvements in urinary function from aquablation were still holding up after five years.

Night blindness makes it hard to see in dim or dark settings, which can affect safety at home and make driving dangerous after dark. While the cause varies, there are steps people can take to address these problems.

What we eat plays an important role in health and quality of life — but is there a single best diet? One newer choice is the largely plant-based portfolio diet, which combines aspects of highly regarded eating patterns and focuses on foods proven to lower harmful blood lipids and enhance cardiovascular health.

The instinct to stay indoors during winter can start to feel confining after a while. Going for a winter hike is a great way to get out in nature and get exercise, but it's quite different from warm-weather hiking, and requires preparation and precautions.