The sugar industry did a lot of research to try to get people to think "all calories are the same" when they are, in fact, not the same. Sugar calories on an "energy in/energy out" diet are the same, but sugar is NOT the same as other calories in how they affect your hormones.

In short, a bunch of pixie sticks and candy is not the same as a steak, even if they are the same calories, when it comes to how full you feel and how hungry you get later.