Healthy aging and longevity Archive

Using a CPAP machine is beneficial for people with obstructive sleep apnea, but if the machine isn’t kept clean it could lead to an illness. There are sanitizing systems available, but cleaning the parts by hand is just as effective.

PrEP (pre-exposure prophylaxis) is a daily medication taken to prevent HIV infection. While multiple studies show PrEP is effective, relatively few of those who might benefit are taking it. Will a 10-year initiative to reduce rates of HIV and a new formulation of PrEP help?

In the journals

People who track their daily steps generally become more active and are less likely to develop certain health problems, suggests a study published online June 25, 2019, by PLOS Medicine. Researchers examined information on about 1,300 adults (41% men), ages 45 to 75, from two trials. Most were nonsmokers in good health and without cardiovascular disease. The people took an average of 7,500 steps a day and did about 90 minutes a week of moderate-to-vigorous physical activity.

For the trials, half the participants tracked their steps with a pedometer for 12 weeks while the others did not. The pedometer group also received handbooks on walking programs and regular interactions with nurses who offered support and helped them set fitness goals. Some continued to track their daily steps after the trials ended, while others said the experience helped them better gauge how many steps they take each day.

In the journals

If you suffer from regular bloating after eating, you may want to check your sodium intake, suggests a study published in July 2019 in The American Journal of Gastroenterology.

Scientists analyzed data from the Dietary Approaches to Stop Hypertension–Sodium trial (DASH-Sodium) from two decades ago. The original study compared the DASH diet — a high-fiber diet low in fat and high in fruits, nuts, and vegetables — against a low-fiber control diet. The study also looked at sodium intake as the participants consumed both high- and low-sodium versions of their diets. The study primarily focused on how dietary sodium affected blood pressure.

In the journals

Reducing your daily calorie intake by about 300 can improve the numbers for several health markers, according to a study published online July 11, 2019, by The Lancet Diabetes & Endocrinology.

Researchers recruited 218 adults with a body mass index of 22 to 27.9, which is in the range of normal weight and slightly overweight. For a month, half the participants ate three meals a day that reflected about a 25% reduction in their normal daily calorie intake. They also engaged in six months of group and individual counseling sessions. People in the other group continued their usual diet.

Ask the doctors

Q. I often wake up with a sore neck in the morning. What can I do to prevent this?

A. Poor sleep habits can cause neck pain or make it worse. Simple changes can make it less likely that you will wake up in pain in the morning.

Sodium doesn't affect everyone equally, but there's good reason to stick to moderate amounts in your diet.

On average, Americans eat too much salt — more than a teaspoon and a half a day. Most often it doesn't come out of a shaker, but is hidden in the foods you eat. But is it really bad for your heart to eat too much, or is that just a concern for people with certain risk factors? There's been some debate on this topic, even among members of the scientific community. We asked Nancy Cook, a professor of medicine at Harvard Medical School, for her thoughts on salt — or more precisely, sodium, a mineral that makes up 40% of salt — and how it affects your health and your heart.

Is salt really bad for your heart?

"There is a fairly undisputed effect of sodium on blood pressure," says Cook. The effect is stronger in people with high blood pressure (hypertension), a sustained blood pressure reading of 120/80 or higher. The data for an effect on cardiovascular disease are somewhat more controversial, she says, but in general, the bulk of research does seem to link lower sodium intake with both lower blood pressure and a lower risk of cardiovascular disease.

Whole grains contain fiber and nutrients that can help your health.

It's a low-carb world, and many people are pushing grains off their plate in an effort to control their waistline. But they may be doing their body a disservice. Whole grains have some unique properties that make them a valuable addition to the diet. Not only do they contain a host of nutrients, such as iron, B vitamins, copper, zinc, and magnesium, but studies have linked diets rich in whole grains to a lower risk of colon cancer, which is a growing health threat for many younger Americans.

"The main benefit of whole cereal grains, such as wheat, oats, and barley, is in the fiber," says Teresa Fung, adjunct professor in the Department of Nutrition at the Harvard T.H. Chan School of Public Health. "Cereal fiber is different from vegetable fiber or bean fiber."

Research we're watching

Do you know someone who is taking supplements in hopes of boosting their energy levels, gaining muscle, or losing weight? You may want to warn them about potential dangers. A study published online June 5, 2019, by the Journal of Adolescent Health found that products sold to boost energy, promote weight loss, or build muscle were linked to three times the number of severe medical events compared with vitamins. Researchers came to this conclusion after looking for supplement-related adverse events reported between January 2004 and April 2015 to the FDA. In total, they identified 977 cases of harm linked to supplements. Of those, 40% were severe medical events that resulted in death or hospitalization. While energy, weight loss, and muscle-building supplements appeared to be the riskiest, products sold to promote sexual function or to cleanse the colon were problematic as well. The FDA has found that some of these supplements contain dangerous substances or contaminants, such as pesticides, harmful chemicals, or heavy metals. Past studies have connected weight-loss and muscle-building supplements with serious, sometimes fatal, health problems, including liver damage, stroke, and testicular cancer.

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