Marisol feels hungry often and tends to overeat as a result. marisol's doctor explained to her that her blood sugar level is currently very high, and this has been known to cause an increase in a particular hormone which can result in increased appetite and the tendency to overeat. the hormone that appears to be causing marisol to overeat is called

The hormone that's causing Marisol to overeat is INSULIN.

Marisol is suffering from diabetes. In diabetes the insulin production is very little or non existing.  Since the insulin allows the glucose to enter the cells, and in diabetes this hormone practically doesn't exist, the glucose will accumulate in the blood, causing hyperglycemia, and she will be hungry because the cells don't have energy (glucose) entering.

It's cell theory. easy name i would think.