Healthy Later Life Chances Decrease with Obesity

2032

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A study published online last night in the British Medical Journal shows that women who are overweight in midlife are at increased risk of various health problems, from chronic diseases to cognitive impairment, once they pass age 70.

Conversely, the study found, women who were lean at midlife were most likely to be healthy after 70.

Researchers at the Harvard School of Public Health and Brigham and Women’s Hospital (both in Boston) analyzed data for more than 17,000 women collected through the ongoing Nurses’ Health Study, which started in 1976. Just under 10 percent of the women in the study who had lived to age 70 or beyond (their mean age was 50 when the Nurses’ Health Study began) reported being free of the 11 major chronic diseases the researchers tracked, maintaining good mental health and cognitive and physical function.

The likelihood of making it into that elite group decreased as BMI (body mass index) increased. Obese women were nearly 80 percent less likely to be healthy after age 70 than lean women. The least likely of all to remain healthy in later years were women who were overweight at age 18 and who gained more than 22 pounds by the time they turned 50. And whether they were lean, overweight or obese at age 18, women who gained weight by midlife had less chance of being healthy over 70 than those whose weight remained steady.

The study controlled for socioeconomic status and for smoking, diet and other lifestyle behaviors that could affect physical and mental health. One caveat: Most of the women studied were white, so researchers aren’t sure their findings extend broadly across the general population.

Still, the study adds new fodder to the often-heated debate about how closely body weight correlates to health. While the common wisdom is that being overweight puts people at increased risk of life-shortening diseases such as cancer, diabetes and cardiovascular disease, others say no such cause-and-effect relationship has been scientifically established and that people can be very healthy even if they’re overweight or even obese. The new research is the first, according to its authors, to examine the role of overweight and obesity in overall health among women who survive to older ages.

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