Sugar makes you hungry. Sugar signals to your body, “There’s this incredible food resource in the environment we’re not evolved for,” so you rush out to get sugar. The problem is the sugar effect dominates the fat effect. If you eat a fatty meal and you throw some sugar in, the sugar is going to deliver hunger and fat is going to deliver the calories and you’re just going to binge. That’s why all desserts are large combinations of fat and carbs together.