I have a black domestic (medium/long) shorthair that although is a butt, is loved very dearly by me and my girlfriend. He is of healthy weight at 10 lbs, and we feed him 3 cans of wet (Hills Science Diet, Healthy Cuisine, 3oz) food a day. After going to a vet, dry food affects his gums adversely and he cannot eat it, or risk kitty dentures down the line.
His feeding schedule is 1 can in the morning, and 2 at night. Despite this schedule which is recommended not only by my vet but by the food maker as well, he is constantly hungry and loves to complain about it. He has lost weight since we were at the vet last, and goes so far as to jump on counters and other locations for food when we're not looking, even though he knows he's not supposed to.
Why is my cat so hungry constantly, and would feeding him more be a detriment?
Edit: It has been about 6 months since his last vet visit, and his weight drop was from 12 lbs to his current 10.