Diet can be really hard since there would be a lot of food to keep astray from and so people tend to starve themselves to desperately lose weight!
That is NOT the case. Your body is responsible about what to do with all the sugars you take where you either burn them all up or convert them to fat! Here are some of the hormones responsible.
Insulin. Insulin is your primary hormone for burning sugars. It is related to diabetes since low Insulin levels lead to too much sugar in your body.
Cortisol. Also knoen as your stress hormone and apparently, this hormone tells your body to store fat when you get stressed.Leptin. The hunger hormone. This is what tells your body whether do you need more food or are you already full!