There’s no way to sugarcoat this news: Nearly half of American adults will be obese within a decade and one-quarter will be severely so, a new report predicts.

It corrects for a weakness in previous estimates that may have made the problem seem not as big as it really is. Those estimates often relied on national health surveys and people tend to understate their weight in those.

The new work used a decades-long federal study in which weight was measured to get a more accurate picture of trends and to project into the future.

“It’s alarming,” said a nutrition expert with no role in the study, Dr. Lawrence Appel of Johns Hopkins University. “We’re going to have some pretty awful problems” medically and financially because so many people weigh too much, he said.

The New England Journal of Medicine published the study Wednesday. It was led by scientists at Harvard and George Washington universities.

Obesity raises the risk of heart disease, stroke, diabetes, cancer and other health problems. It’s gauged by body mass index, or BMI, a measure of weight relative to height. Underweight or normal is a BMI under 25; overweight […]

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