Andreas took ES for 10 years.
I started flushing for a gallstone and got rid off my year round allergies to pollen etc. I don't know if I had food allergies .
Midge, if you are interested you should buy Andreas book "Timeless secrets etc", he will tell you what your son can eat, I don't expect it to be soy (estrogen),milk (is for calves)and eggs (to grow chickens) :)
Even if you don't want to follow him completely his views and explanations are great. http://www.ener-chi.com
When you read under Interviews with authors he says that he started studying at 11, because he had IBS, arthritis, heart trouble, liver stones etc.
BTW I had liverflukes at one time, I did not know till months later I read about it.
It disappeared with liverflushes and bowelcleaning.