You Say Potato, Scale Says Uh-Oh

Eating more potato chips and French fries is likely to lead to a bigger weight gain over the years than the weight change associated with eating more of other foods, new research indicates.

The study, from the New England Journal of Medicine, stands out because it quantifies how much weight a person is likely to gain or lose over four years based on one additional daily serving of a range of specific foods. Eating more potatoes correlated with a gain of 1.28 pounds, with French fries in particular associated with a 3.35-pound gain.

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This type of study can't definitively say that certain foods cause weight changes. But it found one additional daily serving of potato chips was associated with a 1.69-pound gain; sugary drinks, processed meat and red meat were associated with about a one-pound gain. Eating more fruits and vegetables, nuts, whole grains and yogurt correlated with slight weight loss over four years. Big jumps in physical activity were associated with smaller weight gains, and increased TV-viewing with bigger gains.