Answer:
All of the above.
Explanation:
Doesn't it depend on the individual person? So all or none really.
The best was to regulate your eating habits is to eat only when you are hungry.
Answer: Hormones
Explanation: A hormone is any member of a class of signaling molecules, produced by glands in multicellular organisms, that are transported by the circulatory system to target distant organs to regulate physiology and behavior
Red blood cells is the answer :)