The most dramatic weight reduction I had was 35lbs. I played football at 170 and weighed in at 135 for regionals my senior year. Do I regret it??? Nope. Did I learn from it??? Yep. Would I let my child do something that drastic??? No way. The one thing I would do is let him cut what was needed. I don't think it is such a bad thing for a wrestler to pull 10 lbs for the team if needed. I think it is a good thing if done right. Plus it lets you know that you can do about anything if you sacrifice a little.