I work out, so I eat to build muscle. Seeing direct results from eating means I will keep eating enough and eating right. It gives me control over something I can control (my body), which helps with anxiety.
Disordered eating is an umbrella term that refers to a variety of eating behaviors. The experiment here is to try to create regularity and structure in your eating. Set clear goals, and remove choas and confusion when possible.
(Note: I try to do that by streamlining my decisions. This insightful article, by The New Yorker's Maria Konnikova, explains why I always that's important to me.)