There are different schemes based on whether or not a person is diabetic to begin with.  The simple answer is that insulin regulates the absorption of sugars.  If your body, for whatever reason, cannot handle that by itself then you have to manually manipulate your own insulin levels.  This gives you a physical control over what normally is an automatic process.  Leverage it one way or another and you can artificially drop&#x2F;gain weight as needed.  It isn&#x27;t healthy, but it is done.