It seems it doesnt matter how much you feed this cat, in a short time he comes back meowing for food. Sometimes right AFTER he is done eating. Also this is getting very bad in the middle of the night to. THe cats starts to meow around two sometimes. Most of the time it is around 4 and is just strait meowing for food. THen the same thing happens, we feed him then comes back for more or will either throw up after because he has been chewing on plants. He is 12 years old, been spayed etc...always goes for his annual tests. We brought him to the vet some time ago for this problem and they say it this and that, but I feel they like to play on people heart strings when it comes to there pets.
Comment by Kate
Did the vet do a blood test for the thyroid? It is good to rule this out as if they do have a problem then they can lose lots of weight in a very short period of time even though they eat and eat.