Zitat:
Conventional guidelines fail to take into account changes in metabolism, says US expert Dr Kevin Hall.
As a result, dieting is always going to be a struggle, he argues. Cutting calories leads to a slowing of metabolism which means it takes longer to lose weight.
At a rate of 100 calories lost per day, it would take the average person a year to shed 5lb of body weight. Under the "old" guidelines, based on the idea that each pound is equivalent to 3,500 calories, the same degree of weight loss should be possible in roughly half that time.
Speaking at the annual meeting of the American Association for the Advancement of Science (AAAS) in Vancouver, Canada, Dr Hall said: "People have used this rule of thumb to predict how much weight people should lose for decades now, but it turns out to be incredibly wrong.
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