User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-5043481-20130404185353/@comment-63.155.177.184-20130404194117

Unlucky cat is there to make it less desireable to take those foods, since most of those foods have things like lucky cat alongside unlucky. So it's pointless for you and me, from the player perspective, but from a game design perspective it's a valuable tool to balance food combinations.