Myth: Eating at night makes you fat.

Reality: Calories count, whenever you eat them.

There's no proof for this myth, Rosenbloom says. She notes some small studies with mixed results, tests on animals, and a belief that because eating breakfast is linked to lower BMI, eating at night isn't as good. But all in all, Rosenbloom says, it's your calorie total that matters, day or night.