Calories keep your body fueled and functioning properly, but what exactly is a calorie and how many do you actually need?

You may unsubscribe at any time. A calorie is a unit of energy used to express how much energy you exert or consume daily. We need calories; they give the body fuel and the ability to function.

But does that extra bit of muscle really make a difference? And how does fat factor in? Calories are units of energy from food that power every bodily process, and the body stores an excess of them as ...