Hello. I know how difficult it is to solve these issues on your own. We went through a similar thing when our child was diagnosed at age 8. We did an incredible amount of research and found some companies in Europe that distribute xylose isomerase. We first taught her to swallow these large capsules. After reading the information, we found that most capsules help with approximately 6 grams of fructose. We started with 6 per meal and now we are down to 2 capsules per meal. It helps beyond belief.

To further assist with this, you should also consider giving him probiotics to build up the good bacteria in the gut and when giving fats in diet make sure to give ginger infused water to keep everything moving in the gut.