Hello,
IBS can cause
weight loss if the patient eats food that he can't tolerate. However weight can be maintained by taking healthy food.
He can take fruits like carrots, cucumbers, green beans, potatoes, squash, tomatoes, lettuce, cane sugar, maple juice. Lean
proteins like chicken, eggs, fish, turkey. Bananas , grapes, oranges.
Avoid high fat food, alcoholic & caffeinated beverages, whole milk, fried food, beans, cabbages, lactose & galactans, garlic & onions, etc.
He should get clinically assessed by a GP & treated for IBS. He may need medications like Rafaximin(Xifanxan), Alosetron(
Lotronex), probiotics, peppermint,
stress reduction & eating food at proper time.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Nupur K, General & Family Physician