Purina Cat Chow is literally one of the worst foods, ever. The ingredients are below.
Poultry by-product meal, corn meal, corn gluten meal, ground whole wheat, brewers rice, soy flour, animal fat preserved with mixed-tocopherols (form of Vitamin E), fish meal, meat and bone meal, brewers dried yeast, phosphoric acid, animal digest, calcium carbonate, tetra sodium pyrophosphate, salt, potassium chloride, choline chloride, calcium phosphate, taurine, zinc sulfate, Vitamin E supplement, ferrous sulfate, manganese sulfate, niacin, Vitamin A supplement, calcium pantothenate, thiamine mononitrate, added color (Red 40), copper sulfate, riboflavin supplement, Vitamin B-12 supplement, pyridoxine hydrochloride, folic acid, Vitamin D-3 supplement, calcium iodate, biotin, menadione sodium bisulfite complex (source of Vitamin K activity), sodium selenite. F-4501
There is NOTHING good about this food.
With that being said, the amount of food depends on the food itself. Pretty much all protein in this food is low quality and not very usable so it's not surprise they want to eat a ton of it.
My adult cat gets a grain-free protein dense dry food called Petcurean Go! Fit + Free. She gets 1/2c per day. She's a 14 pound 8 year old female. Dry food is very bad for cats. I discourage feeding it, I only feed it because my cat would starve to death before she ate wet food and I've gave up on converting her. My foster kitten gets a 100% wet diet.