I have a relative who is morbidly obese and has been for 20+ years. To my mind she acts no different to an alcoholic.. always going on about food, says stuff like "I need to eat something!" 10x a day, getting cross if she has gone an hour without food. As kids we were sent on a walk up the road to fetch chocolate in the evenings.
She had an alcoholic parent and there was a point when any time one of us has an alcoholic drink she makes comments about it. She frequently comments on her husbands use, talks about "alkies" in a derogatory sense and will dismiss any man I am dating as an alcoholic if I mention we've been to the pub.
She has been so overweight for so long that she has had joints replaced at 50 and more that need doing. She doesn't acknowledge the arthritis as being weight related, ignores doctors who tell her to lose weight and insists her arthritis is genetic because her 85 year old dad had it. I know she will need full time care in the near future as she is barely mobile and cannot walk upstairs without getting out of breath. To my mind, this is not much different to an alcoholic drinking their liver to death and being in denial.
She occasionally talks about being proud of herself for doing a tiny amount of exercise or "eating well" for a day, then rewarding it with cake. If I stay at their house I often find her secretly snacking or getting up at e.g. 4am to eat more.
Sometimes when she is on a rant about alcohol I want to say "how is this any different to you and food?" but obviously it'd be a heartless thing to say. I guess AIBU for finding it frustrating?