I have had Moses on Primal Raw chicken nugget-form for about 6 months. He loves it!

How much should he be eating a day? Each nugget is 50 calories. He seems to always be starving. He was getting 4 nuggets a day and gained weight and was 7.8 pounds. I cut him back to 3 nuggets a day right before he had his liver shunt surgery. When I took him in for his post surgery check up, he weighed 7.06. But he hovers around me in the kitchen and seems to always be starving. Any suggestions or thoughts on this hungry lil' man?