Well, let me introduce you to some hormones that do just those things: the "hunger hormones," leptin and ghrelin.
Leptin is a hormone, made by fat cells, that decreases your appetite. Ghrelin is a hormone that increases appetite, and also plays a role in body weight.
The answer is c-<span>hypertension</span>
I know that B applies, and D might apply assuming it means certain materials can pass through and not all materials can pass through.