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This article originally posted 07 March, 2013 and appeared in  DietObesityIssue 667

Calories Trending Downwards As Obesity Is Going Upwards?

Americans eating less and getting fatter….

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According to survey data from the CDC, US adults have been steadily eating fewer calories for almost a decade, despite the continued increase in obesity rates.

The study analyzed trends since the 1970s and found that among adults, average daily energy intake rose by a total of 314 calories from 1971 to 2003, then fell by 74 calories between 2003 and 2010.

Co-author William Dietz, former CDC director of Nutrition, Physical Activity and Obesity, said, "It's hard to reconcile what these data show, and what is happening with the prevalence of obesity. … Seventy-four calories are a lot, and as I said before, we would expect to see a measurable impact on obesity." Nevertheless, about 35 percent of U.S. adult women are obese, and that percentage has held steady since 1999, according to the CDC. For men, obesity has risen from 27 percent to 35 percent over the same time period.

Dietz said he would have expected obesity rates to have leveled off for both sexes and to be decreasing at this point, if people are consuming fewer calories.

Experts said it's possible more time is needed to see obesity rates respond to changes in calorie intake. It's also possible that Americans have changed their eating habits but are still not getting enough exercise to burn the calories they do consume. If you cut back on calories by 100 calories, you'll plateau 10 pounds (4.5 kg) lower, but you'd only see about half of that progress over the first year.

The change in calorie consumption could be due to more awareness of sugary drinks and added sugar.

American Journal of Clinical Nutrition, March 2013

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This article originally posted 07 March, 2013 and appeared in  DietObesityIssue 667

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