When i was on the standard American diet (S.A.D.) eating raisin bran cereal with milk in the morning I would get gas so bad I could set off fire alarms.
If you're going to eat beans or legumes, it's very important to soak them before cooking them otherwise we get gas from them too. Tofurkey products would also give me horrendous gas so I stopped eating processed vegan foods.
I love living in Hawai'i where I can harvest so much of my own food from the land.
Andreas