You need to look at what is causing you to eat once a day to start with. You need to look at your motivation of why you aren't eating. Most ED's have a lot of pain behind why the person isn't eating.....not just body image issues like they would have you believe. They may turn into body image issues, but they are not the root of the problem. With what you have given us here, there is nothing to go on besides the fact that this is not were to get a DX of an eating disorder in the first place really need a Dr or Pdoc to determine that.

It isn't healghy to eat only one time a day.....that is a given but just the fact that you eat only once a day doesn't define it as an eating disorder.

Maybe if you post more about your situation is woud help you understand yourself better also.....we are here to listen & support