Nutrition labels say raw and roasted peanuts have the same calories, but your body actually gets more energy from roasted ones — the current system doesn’t account for how cooking changes how well your body can digest the fat.

Cooking peanuts makes it easier for the body to digest the fats inside them, so you get more energy from them than if you ate them raw. The usual way we calculate food energy doesn’t account for this boost, but this study shows it’s real.