What Are Negative Calorie Foods?

When you break it down, a food is something that is supposed to provide us with nutrients and we measure these nutrients by how many calories the food gives us. So if it's a food, how can it take calories away? Let's look at black coffee. In drinking a cup it takes energy which is delivered to the muscles involved. This energy is measured in calories and these calories are stored in body fat. How many calories do we get from black coffee? A cup of coffee consists of water which has no calories, and particles of coffee which is high in caffeine but little else.