An average 4kg cat needs approx 200 calories per day, which isn’t an exact amount as activity levels, metabolism, etc vary from cat to cat.
I have a very fussy eater and it’s difficult to get food into her so I needed to do a bit of research into the calorie contents of some foods to make sure she was getting enough to eat.
So, if you do find something the cat likes it’s worth contacting the company to find out calorie contents which is what I did.
For example some of the Applaws complementary sachets of chicken or fish have a mere 25 calories in them and if you were going by an average two sachets per day rule they’d only be getting 50 calories, so a quarter of what they need.
As I say, this does all depend on different cats and their builds etc, but approx 200 was what research told me.
My own cat is a small build and at 4kg she would probably sustain her weight on about 150-175 cals.
Now I’m not boring on about this for the sake of it, just to point out some of the complementary wet foods have very few calories indeed, and could leave a cat hungry. Plus as someone else pointed out they don’t supply everything the cat needs.
Also,they do recommend feeding at least two separate meals per day as cats are essentially grazers and there’s some kind of health reason behind the at least two meals per day rule, although right now I can’t remember what it is.
Didn’t mean for this to sound preachy so hope it didn’t!