Insulin and body building.. why do people take it?

Insulin is something most people with type II diabetes will take before eating a meal. However, body builders take insulin too. Why is that?

"insulin helps store the sugar in your liver and releases it when your blood sugar level is low or if you need more sugar, such as in between meals or during physical activity. Therefore"  Body builders take this to keep themselves as thin as possible to make sure their body can keep up with the amount of sugars and food they eat a day. However, when the pancreas releases insulin its normally the exact match to how many crabs are released into the blood stream. A body builder sees this as a way to keep burning and absorbing as much nutrients as possible.
Is there such thing call insulin gut? The answer is no. Insulin does not give the guts of body builders.

Hess-Fischl, Amy. "What Is Insulin?" EndocrineWeb. Endocrine Web, 25 Mar. 15. Web. 29 Oct. 2015.