Is eating once a day considered an disorder?

It depends on the context.

If a person is choosing to eat only once a day for religious or cultural reasons, then it is not considered a disorder.

However, if a person is restricting their food intake to once a day due to an unhealthy obsession with weight loss or body image, then it may be considered an eating disorder.

Eating disorders are serious mental illnesses that can have serious health consequences. If you are concerned that you or someone you know may have an eating disorder, please seek professional help.