J.G.
Yes, in fact I would most certainly say food sensitivitt. I'd start an elimination diet, one of the biggest things that I didn't really realize that I was eating alot of but was causing my son trouble was onions. I had a bloomin' onion one night on my birthday (my first one in 3 years!) and the day after he had such bad diarrhea and I was like "What the heck?"
In any case, start with milk that is usually the biggest culprit (especially with gas), then continue to cut things based on elimination protocols you find online from reputable sources.
Good luck!