Two thirds of Americans are overweight or obese. Illnesses related to weight problems kill more people than any other disease. Experts are scrambling to find answers for what causes the epidemic and seem to come up with new explanations every day, only to be contradicted by the next study. So far, none of the research has had much impact in practical terms. Some experts warn that despite of all their hard work, finding definite answers may prove elusive for some time to come.
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