First, it is important that you know how to distinguish an healthy eating behavior from a problematic one: those suffering from B.E.D. tend to overeat, or to feed with excessive amounts of food in a given period of time, eating foods of all kinds, and experiencing the feeling of not being able to stop or not to understand what they are eating.
Usually people with a binge eating disorder have low self esteem and poor self-confidence and have difficulty managing emotions.
Once you have recognized the problem if you want to help the sufferer, you can advise him/her to turn to specialized centers for the treatment of eating disorders.