We're doing a food day because users have requested and I to mess with the hunger for pets a few times. Recently, there were a few boards that were like "let's have a day where the hunger count doesn't matter i WNAT TO FEED ALL THE THINGS". We figured this would be a better route, and to kick it off we figured why not bring back a lot of old food items!
The change is to help those who have gourmand pets. The more unique foods you feed your pet, the quicker it'll get hungrier. We've been keeping an eye on the rate and what not, so we might have to change it again once or twice. Like Laurey said, check your food eaten page for your pet for this change to kick in for you! We set everyone's hunger level to 0 about 50 minutes ago (even those in resorts, but they quickly got fed again when it hit 5:00 because of the hourly cron) so they could get a kick start basically to feeding their pets. :)