It’s very difficult to pigeonhole an individual or a group of people and say that anyone trigger starts a food-based relationship. But there is always a trigger, typically an emotional one which could include:
Having a family history of eating disorders or depression.
Having someone criticize your eating habits or your weight.
Feeling pressure to stay slim for work or a hobby.
Having certain characteristics, such as an obsessive personality or a tendency to be anxious.
Experiencing upsetting events, such as a death or abuse.
Relationship difficulties with friends or family members.
Being under a lot of stress, for example at school or university.