User: What would cause someone to lose their appetite suddenly?
Assistant: Hmm, that’s interesting.  There are many possible explanations for this.  Here are some of the main possibilities: 

-Physical illness or discomfort:  nausea, pain, fever, excessive exertion, etc.
-Psychological distress:  anxiety, stress, grief, depression, etc.
-Change in lifestyle or environment:  change of diet, change in bedtime, change in living situation, etc.
-Addiction or abuse:  alcohol, drugs, nicotine, etc.
-Medications:  some prescription drugs can cause decreased appetite, as can some over-the-counter medications.