Stricken Sounds

I have two cats, one of them is very fat and the other one is thin.  The reason for these differing weights is because the fat cat steals all the food from the thin one.  The fat cat never does anything other than lay around all day.  The only exercise this obese feline gets it walking from the couch to the food bowl.  I have tried regulating his food but I have to put down enough food for two cats.  The large cat eats it all so quick that the smaller one does not have a chance.  The poor skinny cat has to fight to get enough food to live.  I feed the skinny cat snacks while the big cat sleeps.  I have to do it quick because the plump cat wakes up and will come begging.