My Husband Is Loosing Weight And We Don't Really Have

My husband is loosing weight and we don't really have a reason. He eats fairly good but usually to tired to eat supper. I fix him a big lunch and he usually eats is all but I have found out he is not eating like he used to although he still can eat really good when at home during the lunch hour. His work is very hard . . . manual labor in a meat packing plant. I just feel something is wrong. He likes to drink beer at night to relax. I think he over does it but he doesn't think so. Should I be worried????
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