The study found that several foods, including yogurt, nuts and grains, actually reduced weight gain over time in adults.
Among all the foods studied, potatoes stood out. Every additional serving of potatoes people added to their regular diet each day made them gain about a pound over four years. It was no surprise that french fries and potato chips are especially fattening. But the study found that even mashed, baked or boiled potatoes were unexpectedly plumping, perhaps because of their effect on the hormone insulin.
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