Yes, of course they can I've never heard of changing a cat's diet simply because of spaying/neutering. Just carry on as you have been. The only reason to change food is personal choice (yours or the cat's )
I'm guessing you are asking the question because MAYBE you have heard that once animals get spayed, they have a tendency towards gaining weight? And THAT is not the food's fault, that is the feeder's fault. Just feed the amount of calories needed to maintain a healthy weight and everything should be good.
Maybe these articles will help you out a little bit:
Simple answer no just feed to the cat the calorie calculators are awesome to help with that .... How old is kitty ? If still a kitten very little caloric need change ...
In theory, a cat is supposed to eat to its hunger. In practice, some pet food manufacturers have done such a good job at making their foods appealing that sometimes cats will eat beyond their hunger, like we sometimes do with yummy food. Kibble is particularly prone to this issue. That's why it's a good idea to keep an eye on the cat's waistline too.
I feed on demand, but I keep a close eye on the cats' weight too. At the first sign of gain, I reduce portion sizes a little. Also, if the cats suddenly get fussy about the food or stop clearing their plates, I take that as a sign that they're getting more than they need and adjust accordingly. I feed Asha an all wet diet, and Shadow a mostly wet diet.
*I should add that an 8 month cat will still have a little growing to do. [B Proportionate gain is fine. Warning signs for gain are things like losing waist definition altogether, tummy hanging down, unable to feel ribs etc.
Colubine covered most of it ... 8 months is still kitten by the most strict of thinking many cats actually dont finish till age 2-5 ... I also monitor and adjust the bag is only a guideline
I free feed my cats. I have dry food available at all times and water too. They get treats and canned food a couple times a week. My Luci definitely gained weight after her spay but neither of my boys did. They are all just over a year and was spayed around 6 - 8 months of age. Luci's weight gain isn't extensive but she don't eat a lot. She guards the food dish and gorges herself when the boys are around but other than that she just picks at it. She don't like too many treats but LOVES canned food so I have to limit her on that.
Yes, cats are 'suppose' to eat according to hunger. However, sometimes if a cat was homeless and didn't know whether or when her next meal was coming from (if at all), she will overeat. And then if/when she finds a home, the trend will continue until she feels safe and secure that she will always have enough food.