"It's hard to lose weight once you gain it," he said. "Anything that will give people a clue about what might prevent weight gain if they follow through with it is helpful."
Potato chips are piling on the pounds, study finds →
"They're very tasty and they have a very good texture. People generally don't take one or two chips. They have a whole bag," said obesity expert Dr. F. Xavier Pi-Sunyer of the St. Luke's-Roosevelt Hospital Center in New York.