What could cause someone to keep losing weight, even if they eat regularly?

Trixies Mama

New member
My 23 year old brother is continuously losing weight. He eats quite a bit, but he keeps losing weight. My mom and I are worried about him, but he doesn't think it's a big deal.

Any ideas about what could be wrong with him?
Also, he doesn't work out, or exercise in the least. He just sleeps, and plays World of Warcraft.
 
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