Thanks for your query. Children with autism are known to be prone to digestive tract disorders. They frequently have loose, extremely foul-smelling stools and gaseousness. These symptoms are not associated with growth failure and cannot be explained by the limited diet preference of these children. In most of the cases, children had disaccharidase/glucoamylase enzyme activities below the normal range. Carbohydrate malabsorption may result in gaseousness with crampy abdominal pain and may be the cause of chronic loose stools. The most frequent finding was a low lactase activity in children with pathologic disaccharidase results. If a child has some of the following symptoms, it may be worthwhile to order some digestive function tests. Signs and symptoms pertaining to the digestive tract: * Chronic diarrhoea or loose stools; undigested food or mucus in stools * Foul-smelling stools; oily or foamy stools; yellow, orange or pale stools * Rectal itching, burning or apparent discomfort when passing stools * Abdominal pain, cramping, or discomfort * Reflux or excessive burping * Abdominal bloating, especially after food, excess gas * Problematic reactions to foods * Gluten and/or Casein sensitivity * Reactions to phenols and/or salicylates in foods * Food allergies and intolerances (manifest as dark circles or puffiness under the eyes, redness of the cheeks or ears, post-nasal drips, headaches, skin rashes, asthma, environmental allergies, attention deficits, and behavioral problems) Hope that helps.