Completely OT and unrelated to sah/woh..

Digestive problems can make eating an unpleasant activity and cause unhappy associations with food. I don't find it odd at all that somebody with digestive problems would be thin. My BIL is thin and has been all his life because digestive problems made eating into an unpleasant activity he avoids as much as possible. He also had those problems since infancy, which is also not uncommon. In short, there is nothing odd about somebody being thin, young and having digestive problems. My BIL is markedly thinner than everybody else in photos taken of him at age 20.