I'm the only alcoholic in my immediate family. However, I think addiction takes many forms. My older sister has self-harmed since middle school. She is almost 40 and still does it at times. It gives her a physical release that makes her feel better emotionally. Before an alcoholic, which never took place until my 30s and after my child, I was VERY regimented with weight/exercise. I weighed almost 50 lbs. less than I do now (god I miss it) and obsessed at times. It was never a full blown disorder, but I definitely get the control and obsessive part.
Unfortunately I decided to NGAF and ate/drank myself so I'm a disgusting blob now. I don't recommend it. Work in progress.