Actually, tapeworms are only rarely implicated in an increased appetite or weight loss in a cat. Additionally, tapeworms are not associated with drinking a lot of water either. To confirm a diagnosis of tapeworm infection, you really should either be seeing the visible tapeworm segments (on the stools or around the cat's rectum) or your veterinarian might identify the eggs in a stool specimen microscopic check.
Back to my original suggestion...if you truly feel that your cat is eating more food than normal and drinking a lot of water, you should have him examined by your veterinarian.
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