For rats on the high-fat diet, the group that ate both types of potato chips gobbled more food, gained more weight, and developed more fatty tissue than the rats that ate only the high-calorie chips.

FORBES: Why Eating Fake Fat Can Make You Real Fat

It may seem paradoxical that the slimmer rats would want to eat less than the fat ones.

ECONOMIST: Obesity

The study (PDF) used laboratory rats that were fed either a high-fat or low-fat diet of rat vittles.

FORBES: Why Eating Fake Fat Can Make You Real Fat