Instead, use language that shows your concern and willingness to help. This is less likely to put the person on the defensive and cause immediate denial. The people with eating disturbances or disorders are probably feeling isolated and ashamed. Another way to avoid alienating the person is to discuss the behaviors rather than the person or their character. Be specific about why you suspect an eating disturbance or disorder.
Denial is common.
You should be prepared to hear the person deny that the problem exists. Indeed, the problem may not exist or, more likely, the person doesn't feel that they have a problem. If you have cited specific behaviors, you probably have a good reason to suspect a problem. Let the person know that you are there to listen whenever they need help. If the behaviors persist, you may want to document them again and reapproach the person.