I would wonder what his diet is like. He may be eating foods that he needs to avoid, wheat, dairy, ect. Also he mat need to be evaluated for Candida causing the regressive symptoms. He may have allergies as most autistic people do, and enviromental factors also play a major role in symptoms. My son had a really rough week the past two weeks due to the continous rains. this caused an increase in the air born molds. Nystatin really helps my son with the candida, it lessens the behavioral problems. Also replacing the good bacteria after the yeast dies off is also important. We use Culturelle GG, for replacing the good bacteria. Unfortunately just introducing a new food item can be devastating to an autistic person, because there intestinal lining does not function well, causing many problems. i would find out what the diet is like, if he is receiving any supplemental vitamins, which are vital, and the big question is do his parents know that there are ways to minimize symptoms, and potentially cure them. I wish you the best.
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Adult Autism & Regression 
