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.
What the researchers did was give rats two substances found in foods: Omega-3 fatty acids, a kind of fat that the body can't make enough of on its own, and uridine, one of the building blocks of DNA, which promotes a cell's energy-making process.