Your weight is controlled, in part, by your brain. There is a complex feedback system that let's your brain know how much energy you have stored -- and a hardwired drive to eat when your brain thinks you need more food. Ghrelin is one of the hormones involved in this appetite control system.
Ghrelin: Controlling appetite
At the most basic level, we are all driven to seek out food. This motivation to eat is inherent to all animals, because we simply can't live without energy from food. Tasty fo...
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