A person goes shopping on an empty stomach. The person purchases more groceries than intended, then remembers the smells of the food samples being passed out at the store, which must have persuaded the shopper to purchase items not on the shopping list, because

the person's parasympathetic nervous system simulated the gastric glands to secrete gastrin, causing hunger pangs

Explanation:

This feeling is one which is usually felt as one intends to satisfy one's hungry feeling. When in a state of hunger with one's system craving for food, one continually feels the need to eat as much as possible as the gastric glands continue to function in other aid to the one's quest to get food into the belly. This explains why an hungry shopper will continously perceive what seems to be food Aroma. Thus feeling leads to one craving for food amount which one will most likely be unable to consume.

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