My cat was abandoned and living in a parking garage before I adopted him, so I have no idea about his medical history. I've had him for about 8 months, and he's about 2.
He's a large cat (vet estimated his ideal weight to be around 14 pounds, which he was at in early November). However, over the past two months he's put on a lot of weight. There has been no change in his diet or amount of exercise--he gets 3/4 cup food a day spread out over two meals (I feed him with a forager ball otherwise he eats everything in about 5 minutes, so it takes him around 30 minutes to eat each portion and he has to push the ball around to get at the food), and has never gotten treats. For a while, his weight was pretty static, but he's really added on the pounds the last two months (stomach/fat pad area is starting to hang low). I've cut his food back a little, but he's a big cat and 3/4 cup doesn't seem excessive for him. He gets some playtime each day, but is overall not a very active cat (he's also not very playful in general and won't play for very long and only with a few types of toys). He has a cat tree that he plays in as well.
Other than really trying to increase exercise, I'm not sure what else I should try. Should I bring him to the vet in order to get him checked out? (I'm a little reluctant to do this, since he's already had three separate vet visits since I got him, to monitor his weight and make sure he was healthy, and those add up!) Most of the advice I've seen tells me to limit portions/cut out treats, but he's never had anything other than controlled portions and no food treats.