Well, they don't need it because they are carnivores, but I don't dare eat a slice of bread without Logan on the other side eating off the unguarded end lol.
I also have to share the whipped cream on my hot chocolates, mushroom soup, and my Doritos chips. Logan likes pineapple too, he's a little weird.
I very very rarely let them have this kind of stuff because I don't honestly think its very good for them. I do let them have a lick of butter now and then, I read somewhere it helps with hairballs and they love it
I have plants they are allowed to chew on, I have "donated" a spider plant to them to chew with abandon. I tried growing grass indoors, but they made such a mess of it I had to get rid of it. That's as close to veggies they get.
Onions, garlic and chocolate are big no no's -very toxic to them. My cats love the smell of onion. If I chop an onion in dinner then go down to see them after dinner (and after I've done the dishes etc), all four will come and sniff my hand, Kisa and Logan will grab my hand and scent it, lick, bite, chew, gnaw and roll around like it's catnip. There is none actually on me, it's just the smell of it. I have to be careful because they get pretty feisty, to the point of drawing blood and they get really nasty when I pull away lol.
Anyways....that's my take on it.