After accounting for differences in metabolism and other factors, the scientists concluded that some people simply burn more calories by fidgeting or in maintaining posture. In the future, understanding how much biology has to do with weight gain may be useful if doctors come up with new weight control drugs. Certain drugs may work better on certain genetic makeups. Genetics research is too preliminary. Food intake is almost impossible to measure accurately, short of following a person around the clock and recording every morsel swallowed.
Calories burned are difficult to measure for the same reason.
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