Diet and nutrition Archive

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Avocados are one of the few fruits (yes, technically they're a fruit, not a veggie) that contain healthy unsaturated fats. These fats help lower undesirable LDL cholesterol when eaten in place of saturated fat.

The popular Haas avocado, which has dark-green, nubby skin, grows year-round in California. A larger variety with smoother, bright-green skin grows in Florida. Marketed as SlimCado, it contains about half the fat and a third fewer calories than Haas avocados.

Research we're watching

Monounsaturated fats — which fall under the umbrella of unsaturated fats — are found in olives, nuts, and avocados, as well as in meat and dairy products. Although some studies have found that diets rich in monounsaturated fat lower the risk of heart disease, others have not.

But the source of the fat appears to make a difference. That's according to researchers at the Harvard T.H. Chan School of Public Health, who studied dietary data from more than 90,000 people over an average of 22 years. Heart disease risk was lower when unhealthy saturated fat, refined carbohydrates, or trans fat was replaced by plant-based monounsaturated fat, but not by animal-based monounsaturated fat. Higher intake of the plant-based fats was associated with a 16% lower risk of dying from any cause. In contrast, higher intake of the animal-based fats was linked to a 21% higher risk of dying from any cause.

While the low-carb diet trend is still going strong, experts suggest you pay more attention to quality, not quantity.

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Over the years, carbohydrates have become nutritional villains. It seems everywhere you look, people advise you to watch carbs, cut carbs, or go low-carb. But you need carbs — and more than you may think.

Dietary carbs provide the body's primary energy source, glucose, which fuels everything you do, from breathing to thinking to running.

These strategies may offer greater protection.

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While there's no cure for Alzheimer's disease, ongoing research has suggested there may be ways to lower your risk.

"Much of the existing science supports how certain behavioral changes made in middle age can protect people as they grow older," says Dr. Kirk Daffner, director for the Center for Brain/Mind Medicine at Harvard-affiliated Brigham and Women's Hospital. "However, there is evidence that adopting certain healthy lifestyle habits can benefit older adults too."

In the journals

Choosing better sources of fat can go a long way toward preventing heart disease, according to research recently presented at the American Heart Association's Epidemiology and Prevention — Lifestyle and Cardiometabolic Health Scientific Sessions 2018.

The research team analyzed data from 63,412 women from the Nurses' Health Study and 29,966 men from the Health Professionals Follow-up Study. Both studies used detailed food-frequency questionnaires administered every four years to evaluate the participants' diets. During an average 22 years of follow-up, there were 20,672 deaths among participants — 4,588 of them from heart disease.

Ask the doctors

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Q. My sister insists that I will automatically lose weight if I become a vegetarian. Is this true?

A. While switching to a vegetarian diet can bring health benefits, including weight loss, it doesn't always. After all, cupcakes, cookies, and candy are technically vegetarian foods — but not necessarily ones that will improve your health or help you shed pounds. That said, a well-constructed and healthy plant-based vegetarian diet can help you lose weight over time, provided you make good food choices and reduce the number of calories you normally eat. The USDA notes that a healthy vegetarian eating plan includes a variety of nutrients, including protein sources to make up for meat options you are cutting out. Some good substitutions are beans, nuts, and soy products. Beyond making sure you get the right combination of nutrients, also focus on portion size and calories if you are looking to lose weight. Ultimately, keep in mind that a vegetarian diet, like any other, may help you lose weight, but it can also result in weight gain if you take in more calories than you burn off on a regular basis.

Research we're watching

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Many people switch from stove to grill in the warmer months. But a new study links regular consumption of grilled meat to an elevated risk of high blood pressure. A study presented at the American Heart Association's 2018 Epidemiology and Prevention — Lifestyle and Cardiometabolic Health Scientific Sessions looked at more than 100,000 people in three different studies who ate at least two servings of beef, poultry, or fish each week.

They found that those who grilled their meat or broiled or roasted it at high temperatures more than 15 times each month had a 17% higher risk of high blood pressure than people who grilled, roasted, or broiled less than four times a month.

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Newer medications, which may be safer than earlier drugs, have expanded the options for treating obesity.

Obesity is now considered more than a risk factor for other conditions; it's a disease itself. It has been the subject of intense scientific and medical research to develop effective treatments. But the quest has been elusive.

Trying new foods, cooking in batches, and inviting friends to dinner give mealtime some zing.

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You may be bored if you're eating the same foods all the time. Even worse, you may be missing out on important nutrients from foods that aren't part of your regular diet. And if that's the case, you're not alone. "I see it a lot with older adults. Their diet isn't great. They get into a rut and cook simple meals, or they rely on prepared food," says dietitian Teresa Fung, adjunct professor in the nutrition department at the Harvard T.H. Chan School of Public Health.

Why the rut?

There are many reasons why people get into a menu rut or stop eating healthy, nutritious foods in older age. It may be that you're