Nutrition Archive

Research we're watching

Eating more plant-based protein may help you live longer, a new study suggests.

The study included 70,000 Japanese men and women ages 45 to 74 with no history of cancer, heart disease, or stroke. They filled out detailed diet questionnaires at the start of the study and again every five years.

In the journals

Research continues to explore the possible benefits of omega-3 fish oil supplements, especially for heart health, and a recent review of existing data suggests they may protect against heart attack and coronary artery disease.

Researchers from Harvard's T.H. Chan School of Public Health and Brigham and Women's Hospital examined 13 trials, involving almost 128,000 people, to look for any association between omega-3 supplements and the risk of heart attacks, strokes, coronary artery disease, and death from cardiovascular disease. Their results were published online Sept. 30, 2019, by the Journal of the American Heart Association.

In the journals

A study published online Sept. 4, 2019, by the International Journal of Cancer showed a possible connection between regular mushroom consumption and a lower risk of prostate cancer.

The researchers recruited more than 36,000 men ages 40 to 79. They recorded various health information, such as physical activity, family and medical history, and diet. Information on diet included 39 foods and beverages. The men were then followed for a period ranging from 13 to almost 25 years.

Ask the doctors

Q. I know that osteoporosis is linked to hereditary factors that I can't change. But are there things I can do to reduce my risk?

A. It's true that many risk factors for osteoporosis, such as your sex, age, and genes, are not things you can change. But there are things you can do to improve your bone health. This includes adopting a healthy diet that is rich in calcium and getting enough vitamin D, which can help maintain and improve bone health. Regular exercise can also help strengthen your bones or prevent bone loss. In particular, activities that put stress on your bones, such as jumping, running, and weight-bearing exercises, can stimulate bone cells to produce proteins that bolster bone strength. In children, these activities can actually increase bone density. While adults don't gain the same degree of benefit that kids do, exercise can still have moderate effects on bone, helping to maintain strength that might otherwise be lost. To further protect bone health, cut down on unhealthy habits, such as smoking or drinking excess amounts of alcohol. If you have risk factors for osteoporosis, you might also want to talk to your doctor about whether any of your medications might be harming your bone health.

Healthful protein, slowly digested carbohydrates, fruit or vegetables serve up best morning mix

As you sleep, your body is hard at work digesting yesterday's dinner. By the time you wake up, your body and brain are demanding fresh fuel. "Breaking the fast" is a key way to power up in the morning. Do it right and the benefits can last all day.

If you miss the day's first meal, notes Dr. David S. Ludwig, a nutrition expert at Harvard-affiliated Children's Hospital Boston, you may start off with an energy deficit and have to tap into your energy reserves.

Nonprofit groups offer services that can help you age in place.

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The holidays are a time of giving, but they're also a time to put yourself on the receiving list and assess whether you should be taking advantage of free health-related services offered by nonprofit organizations. Services are widely available, often regardless of income. But you might not know they exist. "Most older adults aren't introduced to support services until they're hospitalized or they work with a case manager or social worker," explains Barbara Moscowitz, a geriatric social worker at Harvard-affiliated Massachusetts General Hospital. "You don't have to wait for such an event."

What's available

On the local level, you can often find free or low-cost dental clinics, emotional support groups, meal or grocery delivery services, transportation, in-home health evaluations, exercise classes, health education classes, home evaluations for fall prevention, companion programs, caregiver respite services, or programs to help you navigate difficult chronic health conditions and their treatment.

News briefs

Americans are starting to eat a healthier diet, but we still have a long way to go, suggests a study (which included Harvard research) published Sept. 24, 2019, in JAMA. Researchers looked at health survey responses gathered from 1999 to 2016 from almost 44,000 American men and women. The good news: during the study, participants improved on the 100-point Healthy Eating Index, thanks to higher intakes of high-quality carbohydrates (such as whole grains), plant protein (such as whole grains and nuts), and unsaturated fats; and lower intakes of added sugars. The not-so-good news: 42% of the American diet is still coming from low-quality carbs, and about 12% is coming from saturated fat. Like turning a massive battleship, it takes time to change eating patterns. These findings confirm that a winning strategy includes swapping low-quality carbs for higher-quality ones, replacing some saturated fats (like those in red meat) with unsaturated fats (like those in nuts and fish), and reducing calories from carbs over all (fewer snacks and drinks with added sugars and refined grains). An outstanding and popular book to guide healthy eating is Eat, Drink and Be Healthy, by Walter Willett and P.J. Skerrett, from Harvard Health Publishing.

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The diet takes vegetarianism to the extreme and poses a risk for nutrient deficiency. But it does offer health benefits.

If tofu turkey and meatless meatloaf are on your holiday menu this year, you may have made the switch to a vegetarian diet, eliminating at least some animal protein. But how much animal protein can you safely cut out of your diet?

Vegetarian diet benefits

Among the many types of vegetarian diets, three are particularly common: a pescatarian diet allows seafood; a lacto-ovo diet allows dairy products and eggs; finally, a vegan diet allows no seafood, dairy, or other animal products.

Here's a host of ideas that support healthy eating and exercise habits.

This holiday season, how about giving the gift of good health? From kitchen tools to a session with a personal trainer, there are many thoughtful presents that can have a lasting impact on a person's cardiovascular health. Here are suggestions from several Harvard experts.

Kitchen tools and gadgets

"Many of my patients want to eat healthier, and one good strategy is to prepare more meals at home. Because this takes time, kitchen tools and gadgets really can be helpful," says registered dietitian Kathy McManus, director of the Department of Nutrition at Harvard-affiliated Brigham and Women's Hospital. One great time-saving tool is an Instant Pot, which works as a pressure cooker, slow cooker, yogurt maker, rice cooker, and steamer, she says.

In Southern states, people often eat black-eyed peas and collard greens on New Year's Day, a tradition believed to bring wealth and good fortune in the coming year. The classic recipe for this dish, called Hoppin' John, often includes some form of pork. But the Half-cup Habit website has a vegetarian version; see https://pulses.org/nap/recipe/hoppin-john.

It may be just luck, but black-eyed peas seem to be less likely than black beans or pinto beans to cause intestinal gas, according to a small study. All legumes contain fiber and substances known as oligosaccharides that can't be broken down by human digestive enzymes. But the billions of bacteria living in the gut can digest oligosaccharides, often creating gas in the process.