That's what self-control is for. Rats don't have much of that. Neither do humans. That's why rats are such good test subjects. The point of the study is that

That's what self-control is for. Rats don't have much of that. Neither do humans. That's why rats are such good test subjects. The point of the study is that your brain gets the pleasure, but no caloric intake to go along with it, so you feel more motivated to get more calories than you would have otherwise.