I decided to experiment on myself. I did not randomize, have a control group, and it was not a blind study. The results were still conclusive.
My avoidance period was not pure, but I had severely cut back on dairy, gluten and soy. I began to, occasionally, eat sandwiches (a gasp from the crowd). Not much of a reaction. Some bread products do seem to cause a limited bloat reaction. However, it also seems that what accompanies the sandwich makes a difference. Poor quality processed meats (more filler and salt) trigger more bloat. Gluten conclusion: low, not daily, levels are acceptable to my system. Better to be more cautious about the salt, sugar, and man made foods that can accompany gluten meals.
Dairy has been a known offender, pretty much since birth. I have found enough dairy substitutes that I am pretty much over it completely. Thank you coconut milk creamer and ice cream! Thank you almond and flax milk! However, I have read that, sometimes, it is the pasteurized dairy products that cause people issues. Something about enzymes being killed off during the pasteurizing process. The dairy experiment involved raw cheddar cheese and gluten free bread. The first sandwich tasted so good I had another later that day. Results: five pound bloat in under 24 hours that lasted a week. It may have lasted longer but I took a 3 day high dose of green juice starting on day 6. Dairy conclusion: no, nope, never, stop it, just don’t do it, not cooked, not raw, not…well, I will finish the double dark chocolate gelato in the fridge.