I differentiate between whole, real food (fruit, veggies, grains, raw meat) and processed crap. I actually don't eat much, if any, processed crap myself, LOL, so there's not much around, but where I would go easy is bread, pasta, anything cooked and spiced and messed with, etc.). Real, whole food is only going to be good for them. I guess in my case it makes up 10-20% of the average day's food (if you include the weeds I pick, etc.).