It is not normal. There is psychological reason usually He will need support and develop internal motivation. I am a certified life coach. Happy to help virtually or in-person as needed. 832 581 7474

I don’t have enough information to answer completely. Is he on medication? Is he obese? Does he skip meals then binge? Does he have anxiety which triggers him to binge? Does he purge (vomit afterward)? What does he “binge” on? Is there a family history of eating disorder?
In other words, it could be ok if he needs the extra calories, but likely represents a concern, likely psychologic (anxiety) or an eating disorder.