Article posted: 1/30/2013 6:10 PM

Sex to burn calories? Authors expose obesity myths

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Conventional wisdom says school gym classes make a big difference in kids' weight. But a report in the Thursday's issue of the New England Journal of Medicine says gym classes often are not long, often or intense enough to make much difference.

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Fact or fiction? Sex burns a lot of calories. Snacking or skipping breakfast is bad. School gym classes make a big difference in kids' weight. All are myths or at least presumptions that may not be true, say researchers who reviewed the science behind some widely held obesity beliefs and found it lacking.