A new report explores myths about weight loss that researchers say are detracting from real solutions to the nation's obesity problem.
Some of the beliefs that they say are not supported by solid science are that snacking or skipping breakfast leads to weight gain, or that losing a lot of weight quickly is not as good as losing a little slowly over the long term.
In fact, some studies show that while many dieters regain weight, those who lose a lot to start with often end up at a lower weight than people who drop modest amounts.
Researchers also say that school gym classes often are too short or not intense enough to make a big difference in kids' weight.
The report is in Thursday's New England Journal of Medicine.