Jason is on his school's wrestling team. He hasn't eaten since early this morning because he is trying to make weight. It is now time for dinner. His stomach is growling and he feels very hungry. One reason for his hunger is that his:

blood glucose level has dropped                                                  

Explanation:              

Hunger: The term "hunger" is described as an individual's urgent need or craving for a specific nutrient or food. Hunger reflects an uneasy sensation that is being occasioned due to lack of food because the meal that a person has was not enough to satisfy his or her hunger.

Because of hunger an individual often feels decreased in his or her blood glucose level and is also referred to as "hypoglycemia".

In the question above, one of the reasons for Jason's hunger is that his blood glucose level has dropped.