Construct a direction field for the differential equation. 
Definitions:
PYY
Peptide YY is a hormone produced in the gut in response to eating, which has been associated with reducing appetite and inhibiting food intake.
Hypothalamus
A region of the brain that controls various autonomic functions, including temperature regulation, hunger, thirst, and the release of hormones.
Stomach
The stomach is a muscular organ located in the upper abdomen that receives food from the esophagus, producing gastric acid and digestive enzymes to aid in food digestion.
Orexin
A type of neurotransmitter that plays an important role in regulating wakefulness, appetite, and arousal.
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