Diet & Weight Loss Archive

Obesity among children and adults dramatically increases the risk of chronic illnesses such as heart disease and type 2 diabetes. What are the contributing factors that lead to being overweight? In this seminar, Harvard Medical School doctors and researchers will address the stigma that surrounds obesity and discuss concrete methods, including changes to sleep and diet, that could help scale back this growing problem.

Each spring, Harvard Medical School's Office of Communications and External Relations organizes a series of four free "mini-med school" classes for the general public in the heart of Boston's Longwood Medical Area. At the end of the seminar series, participants who attend three out of the four sessions receive a certificate of completion. Topics are selected for their appeal to a lay audience and have included the human genome, nutrition, sleep dynamics and health care access. Faculty from Harvard Medical School and its affiliate hospitals volunteer their time to present these lectures to the community.

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.

Along with the growing realization that obesity is a complex disease comes greater understanding that treatments need to be highly individualized and address the physical and emotional factors that contribute to it.

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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.

News briefs

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Here's a simple way to try to control your weight: take more time to eat your meal. It's one of several strategies that appeared to help people in a study published online Feb. 12, 2018, by BMJ Open. Researchers analyzed about six years' worth of health insurance claims and doctor visit details for 60,000 Japanese men and women with type 2 diabetes. The doctor visits included questions about how quickly people ate their meals. People who ate slowly were 42% less likely to be obese than people who gulped down their food. The study was only observational and therefore can't prove that eating slowly caused weight loss, but other studies have reported similar findings. Also, it takes about 15 minutes after you start to eat for the "getting full" signals to reach your brain — and a person can eat a lot of calories in 15 minutes. So slow down and savor every bite. For more information, check out the Harvard Special Health Report 6-Week Plan for Healthy Eating (www.health.harvard.edu/swp).

News briefs

Prepackaged, processed foods are typically high in fat, salt, and sugar. If that's not enough to make you put down a cookie or resist a frozen dinner, consider an observational study published online Feb. 14, 2018, by The BMJ. It analyzed dietary questionnaire answers of 105,000 middle-aged men and women in France for five years. Foods were grouped according to degree of processing — that is, the amount of change the ingredients go through as food makers improve flavor, coloring, and shelf life. For example, dehydrated soups, baked goods, sugary cereals, processed meats, biscuits, and sauces were considered ultra-processed foods. Less processed foods included canned vegetables, cheeses, and freshly made unpackaged bread. Every 10% increase in consumption of ultra-processed foods was associated with a 12% higher risk for cancer in general and an 11% increased risk for breast cancer. No significant link was found to prostate or colorectal cancer. The study doesn't prove that ultra-processed foods cause cancer, but researchers say the cumulative effects of food additives remain largely unknown.

In the journals

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People who make an effort to lose weight can help their partner do the same, according to a study published online Feb. 1, 2018, by Obesity.

The study tracked the weight-loss progress of 130 couples over six months. The couples were divided into two groups. In one group, one member of the couple was enrolled in a Weight Watchers program that provided in-person counseling and online tools to assist with weight loss. In the second group, one member of the couple received a four-page handout with information on ways to lose weight, like healthy eating, exercise, and weight-control strategies.

Research we're watching

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If your food is more likely to come out of a bag or a box than from a tree or the ground, you may be putting yourself at higher risk for cancer. A study published online Feb. 14, 2018, by The BMJ found that people who eat more ultra-processed foods have a higher overall risk of cancer than those who don't. In fact, when the proportion of ultra-processed foods in a person's diet increased by 10%, the risk of cancers increased by more than 10%.

The researchers came to their conclusions after reviewing data from more than 100,000 people, on average 42 years old, based on their usual consumption of 3,300 different foods. The foods were classified according to their level of processing. Ultra-processed foods included things like

Research we're watching

For people with atrial fibrillation, losing a little weight and getting exercise may improve their symptoms, according to a review published online Feb. 7, 2018, by The American Journal of Cardiology.

Atrial fibrillation (or afib) is a common heart rhythm disorder marked by a quivering or fluttering heartbeat, which can cause dizziness and breathlessness. Other symptoms include fatigue, weakness, and fainting.

Ask the doctor

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Q. I'm an 87-year-old man. Over the past year I've lost considerable weight, and I didn't have that much to lose. My doctor can't find any reason for my weight loss and is advising me to eat ice cream. But isn't that risky for my heart?

A. I smiled when I read your letter, because I've occasionally said that if I were to develop a terminal condition, the silver lining on that cloud would be that I could finally eat all the hot fudge sundaes I wanted.