To my knowledge, the older coins that were made out of actual nickle/iron/copper/whateverthefuck were magnetic, but they stopped using real metals like that back in I think the 80s. Newer coins are not magnetic. Also, this boy is doomed to have skeletal problems. Being obese at this point in his life when his body still has so much development and growth to do can NOT be a good thing. Hell, people talk about drug use being bad on developing bodies all the time, and I'd wager that this is probably worse except in extreme cases.