Visit Autism, ADD, ADHD, constipation, candida, asthma, learning / behavioral problems & depression: Gut and Psychology Syndrome (GAPS) Autism, ADD, ADHD, constipation, candida, asthma, learning / behavioral problems & depression: Gut and Psychology Syndrome (GAPS) This is a review of a talk by Dr. Natasha Campbell-McBride regarding the GAPS diet. The GAPS Diet (based on SCD) is proposed as a dietry based treatment for ADD, ADHD, learning/ behavior/ social problems, autism, depression, reflux, constipation and other digestive issues.