Final answer:
Appetite, influenced by psychological factors such as worry and anxiety, can affect eating behavior, with pleasant environments and company often increasing food consumption.
Step-by-step explanation:
The psychological factor that affects eating behavior is appetite which can be reduced by worry and anxiety. These emotional states can upset digestion due to imperfect mastication and the secretion of digestive juices. Furthermore, the consumption of food tends to increase when taken in pleasant surroundings and in good company, demonstrating how psychological factors can have an impact on eating habits.