Fatigue before eating can have various causes, ranging in severity from 'worrying' to 'needs attention'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose fatigue before eating, we could:
When you are suffering from fatigue, do you feel better after eating?
Possible responses:→ I don't suffer from fatigue / don't know
→ No, eating does not help reduce my fatigue
→ Yes, eating seems to reduce my fatigue a little
→ Yes, eating very definitely reduces my fatigue