Hahaha. He sounds like the most awful person ever.
''Oh, I've been pigging out all of my life and now that I make an effort for once for 30 WHOLE DAYS like a big boy I only lose 5 pounds!''
I've seen tougher 6 years old. Seriously, what a waste of a human being.
Edit: I forgot, advice. Uuuuhhhhh simple math? 5 lbs a month is 60lbs a year. That's pretty awesome if you ask me. He could also remove the sand in his vagina.