Your male flame point Siamese has lost muscle mass and weightHe used to sleep a lot more than the other cats he eats and plays and does not appear to be in pain?
We are not vets on this sight, so it would be to your best
interest to take your male Siamese cat to the vets for a good all
round physical and tell the vet about the muscle mass loss. It
could simply be the cat is getting older or is less active. You
know the old saying "You don't use it you lose it!"