I hate poachers and I love animals, but this guy I hard not to love and he does make a good villain. Utterly cruel and psychotic, he loves killing and is greedy. In fact, he's so psychotic that he attempts to feed Cody to the crocodiles when he no longer has use for him.
The first is leptin, which is a hormone secreted by your fat cells that acts as an appetite suppressant. Leptin levels peak when you fill up on food. So, when you eat a lot, your appetite goes away. If you ever said, 'I am so full I couldn't eat another bite,' then in that moment, your body was flooded with leptin.
If your fat cells get bigger, they make more leptin and that suppresses appetite. If fat cells shrink, they make less leptin and that stimulates appetite, he explains. But ghrelin is a hormone that is secreted by the stomach. When you eat something, ghrelin is suppressed, making you not want to eat more. As time progresses after meal, after several hours, ghrelin rises, he says.