I'm watching my sister's cats and they are rather chubby. They've been to the vet several times and found no health issues. They are brothers around a year old. Currently they are eating california natural and have been cut back to well below the minimum recommended amount. Natura suggested .4 cups of dry until they lose weight and right now they are only getting about 1/4 cup dry and a half of a 5oz can each per day (~190kcals) for very large cats. Even if they weren't fat they'd easily be twice the size of mine. Currently they probably weigh over 20lbs each and are still gaining weight. They have fat rolls around their shoulders and their bellies hang out over their legs when they sit. I think lack of activity is contributing alot since they live in an apartment but I don't see any solution for that. The cats have plenty of toys, are given run of the entire place, each other to play with when people are gone, and are played with when people are home. Anyone have any ideas especially changes in diet that might help? We'll see if running around my house playing with my kitten for 3weeks makes any difference. I may have to run a cat fat camp periodically for them.