system
Given the following post, respond as if you're commenting on Reddit:
human
If cats can't taste sugar then why do many popular cat food brands add it?

Like Whiskas. Also why does my cat go mad for the sugary brands?
gpt
Sugar is not only about sweetness in flavor.  It's also a quick and ready source of carbohydrates: energy.

With that said:

Not all cat foods contain added sugar.  In fact many don't but some certainly do. It's a cheap and lazy way for manufactures to boost certain nutrition label figures to make the catfood look more healthy on paper than it is in your cats stomach.  

Cats don't need added sugar.  They really don't need any sugar at all.  But the empty calories from the sugar are like cat cocaine.  They give your cat an energy rush that will keep 'em coming back for more.  Makers know this and know if you don't have all the info you will be prone to buy your cat sugared food because you think it's what your cat prefers.  Avoid the cheap brands that add sugar and make sure kitty is fed well even if you need to spend a few more tuppence.