Cooking at home is something that skinny people often do. And numerous studies have shown it's definitely a factor when it comes to keeping your weight in check. One big perk you get from preparing meals at home is that you actually burn calories when cooking, to the tune of 85 calories per hour. You also burn another 35 calories in 15 minutes of washing post-meal dishes. If you were eating out an average of three times a week and started cooking at home instead two of those nights, you would burn approximately 120 calories twice a week for a total calorie burn of 240 calories per week and a yearly total of 12,480 calories, or about 3 and a half pounds’ worth of calories! One more important skinny secret: Keep your mouth preoccupied when preparing food. Chew on gum or drink a cup of tea to keep you from consuming unwanted calories (translation: those seemingly innocent tastes 'to check' the dish) while you are cooking.