Basically, you feed your pet food and it keeps track of the food your pet's eaten, a point for each unique item. Eventually, you earn your way to achievements for making your pet eat a lot of food xD As of right now it doesn't count towards any stats and what not, it's just for fun and achievements.You can now see what foods your pet has eaten and work toward earning The Gourmand achievement and title!
So, that leads me to my real question - which pet are you using to earn your "Gormand" title? Are you just feeding your main battle pet to keep it up with the rest of their stats? Or are you feeding another pet because it matches their character!
I'm personally feeding my Fen because he's a little chubby snackhound xD Fen is a workaholic, and when he works he likes to snack, and oftentimes he doesn't notice that he's eaten an entire bag of jellybeans or bowl of chips or plate of brownies before he's done working, haha! It seemed extra fitting for him to get the Gourmand title, even though I've only been able to feed him 6 times so far xD