Yes, the best way is to track your own intolerances but there are food which are hipoallergenics. Look for a list in the web. The best protocol I know to repair leaky gut associated to stress is the 3LS program from Dr. Walt Stoll MD. This is a holistic MD who has treated candida and leaky gut for more than 30 years. He has a website called ASK DR STOLL. Easy to find if you google it. The site has a Bulletin Board and Archives with hundreds of topics and experiencies. The same Dr Stoll still answers question every day. The place is also full of testimonies from patients and people who participate every day. His program combined with some supplements may give you a fast solution for the leaky gut. Look for the 3LS program in the archives.
Jorge.