I believe it is the pituitary gland
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I think this question is a bit trivial but when you tan it is your skin telling you that it is being damaged. alot of people dont think it does damage because they have not experienced any affects of it
So, since what you're wanting is pointers for the Essay, then here:
There are many things that affect your food choice.
Biological determinants: Hunger, appetite, taste, cravings, etc
Economic determinants: Cost, income, availability, etc
Social determinants: Culture, family, peers, meal patterns, what you grew up eating, etc.
Physical determinants: Access, Location, education, cooking skills, time
Phycological determinants: Mood, stress, guilt, etc
Attitudes, religion, beliefs, etc.
All of these can decide what you eat, how you eat, when you eat, and how often you eat.
Oil because your body will have trouble digesting fat after this procedure and fatty/greasy/fried foods aren’t a good idea