21 yr male abdominal distension (long term), stomach is alright probably its intestinal gas, stools are loose than normal, lethargy, belly becomes normal after bowel movements, irregular bowel routine. not a stress patient. chronic condition?

The signs and symptoms noted above seem to suggest One is eating 'Gas producing' and /or Difficult- to- Digest Foods. A good review of Diet, preferably with the PCP or Dietician will save One many years of G.I. Dysfunctional issues ; since one is still quite Young at 21 years.

May be food intolerances, gluten ,soy ,milk are the big ones. -eliminate soy for 10 days , then milk products for 10 days then gluten products for 10 days and see if there is a difference. Also consider H pylori infection can check stool or breath, pancreatic enzyme insufficiency or irritable bowel syndrome. Follow up with gastroenterology.