I feed all my cats with non-grain-free cat food. None of my cats become fat or chubby. There are a couple of cats that look slightly chubby but it's because they have bigger body than the other cats. For example, see picture below. Both kittens are same age. Imagine what the bigger kitten look like now. It actually look like little chubby but not fat or overweight.
Neutered/spayed cat can get fat & overweight but it doesn't mean they necessarily will get fat & overweight. Like spunkberry said, it's all about lifestyle & how much you feed your cat. BTW, I feed my cat twice a day & I make sure I didn't over feed them. I also don't like give them treats between meals.
I just want to say, regardless what brand or what kind of food you feed your cat, fat & overweight cat is bad, as much as malnutrition is bad to cat.
QUOTE(jessteong @ Mar 18 2015, 03:02 PM)
Smarthearts no good la,
maybe look fit cos not as nutritious as the good brands.
I don't agree with the bold part. Malnutrition cat won't look fit. They would look sick.
QUOTE(Asak8 @ Mar 19 2015, 10:27 AM)
Yup. I've tried both in my smartsift.
Both failed to do the job.
Cause the basis of smartsift is the clumping mechanism of the sand.
I placed floormat in front of the smartsift, 3 of them side by side to cater the footprint.
Oh, does your cat has any problem using the smartsift with the door closed?
All my 3 cats refuse to use it when the door is closed.

Yes, smartsift only suitable for clumping style litter. Even non-clumping sand litter also not suitable because it's enclosed space & this will make the non-clumping litter expired way earlier than it should be.
Some of my cats also don't want to use it when the door closed but I probably didn't left the door closed long enough for these cats to learn. The ones that have no problem using it even the door closed because I leave the door closed. BTW, I have two smartsift. That's why there's one have door closed & the other one opened. Anyway, I opened the door on both smartsift anyway because the place where I put the smartsift allow the cat to jump to the smartsift (from high place like cabinet). The door parts kinda flimsy, I don't want it to break, so I opened the doors. It also good idea to keep the door open too because my naughty cat like to pull & bite & tear the black filter thing on top of the smartsift.

The clumping litter I use very good in controlling odour anyway.
This post has been edited by kizwan: Mar 19 2015, 12:29 PM