Try not to use food as a way to socialize. Try not to argue at the table where food is being eaten. Such negative experiences become associated with eating and then food is thought of as a problem. Allow older children and adults with eating disorders to be in charge of their own eating, unless the therapist has different advice. Food is not the main issue, but should be regarded as an important issue in the patient's health.
Most people dealing with an eating disorder have a very low self-esteem and poor body image.
This is part of the illness. Do not treat the person with a eating disorder like a young child. If your young child has an eating disorder, that doesn't mean you can't give your child some parental guidance. That can do more harm. Remember that your child has many adult abilities which they need to develop and in most cases food is being used as a control method, which later can become an eating disorder.