Food sensitivity is complex. There are known knows and and probably unknown unknowns! Can we cope with what looks complex in science. I presented a talk on this topic on ABC radio on 3rd Dec 2017. See http://www.abc.net.au/radionational/programs/ockhamsrazor/food-sensitivity-and-the-known-unknowns/9185042 You can see I do have some optimism the future.