I wouldn't eat anything my cats have touched. They stand in their litter box and lick themselves I don't want that in my food.
Sometimes I will give them a little piece of whatever I am eating though.
My cats are pretty good about not stealing food off my plate, but if they do happen to sneak a bite, I'll cut around the piece they were eating from and continue to eat the rest. I hate wasting food. But if they end up slobbering all over it, I won't eat it and I'll give whatever's leftover to the strays.