If I was an allergy researcher with an unlimited budget and unlimited time I would research pregnant women, their eating habits, family medical histories, and their environments. I would aim to have a very large pool to sample from ~20,000 or so, and I would look for correlations in the women who gave birth to babies with food allergies.
Right now, I am so stuck on WHY and HOW. I have one kid with absolutely no food allergies and another one with a bunch of them. Why and how are they so freaking different? I cannot help but feel that environment and diet have somehow caused the allergies in the first place. I'm sure there is a genetic component as well, but that is completely lacking in my case, as far as I know, and I hate the idea that things are just random.