Did't mean to ignore you, I just am not sure how to answer. I have 4 furkids all of varying sizes. My two boys are big, but one is kind of tubby and my 2 girls (Gidget & Fluffy) are both about the right weight. They eat moist food in the morning and at night. About a 1/2 can each of Fancy Feast/Friskies or combination of the 2 both morning and night. Of course Rusty (tubby one, trys and get more than his share, but the girls usually hold their own. My other boy, Garfield is fed seperately because if he has to fight for food he won't eat. Anyway, in addition to that, they get a mixture of dry food which is given out in small handfuls to each a few times a day. The mix includes Purina One Healthy Weight Management, Friskies Meow Mix, Purina One Urinary Tract Health and Friskies Dental Diet. Also, because they are spoiled they get a little bit of cooked chicken as a treat in the morning and at night. I don't know if I underfeed or overfeed. I don't think underfeed. Anyway if you are looking for something diet I think it is a 4 pound bag of the Purina One Healthy Weight Management and it costs about $5/bag. If that is all you would feed them, I am sure it says on the bag how much. I'm not home right now so I can't look. I hope I have given you some suggestions.