MY CAT'S HAIRBALL HAVOC: FOOD CHANGE NEEDED?

My feline friend, Fluffy/Whiskers/Pumpkin, has been having a serious hairball website situation lately. It's truly/really/totally getting out of hand! They cough/hack/spit up these large/massive/giant fur clumps almost every day/night/few hours. I'm starting to wonder if it's due to what they're eating. I've been thinking about switching to a diffe