Try to get help with his ABA team! If he is getting one or talk to a Psychiatrist!

My child did this and still does from time to time. It was/is due to a severe iron deficiency.

Thanks for the responses. Wind chill is -25 in northern Michigan, but we have tried stripping him down in various forms, sometimes down to his underwear. That's when we found out he'll eat his underwear, too. If we take away one piece of clothing, he'll turn his attention to the others. He has a tough time dismantling brand new jeans--he starts down at the bottom of the leg. The school tried those "indestructible" chewy toys--he ate them. They sent them back and got their money back. I don't think he's doing it because he's hungry. He's eating about 6-7 times a day. I'm clueless as to what to do next.

You should try those chewy sticks you get off Amazon.My child constantly wants to eat.unless he has one of those chew sticks than you get an hour or so before asked ng for food

How bout tuff thick clothing? Whats the weather like there? Maybe keep him shirtless at home?