I can't even begin to descible how great this food is! Prior to getting Hill's Science, I was feeding my cat that junk/cheap food from the grocery store that was equivalent to eating air. That food never filled him up and I was always over feeding him while constantly waking up at 3:00 or 4:00 in the morning to feed him because his 9:00 pm feeding couldn't carry him through the night. While he never gained any weight from that method, it wasn't the best for either of us.