User blog comment:RandomKing57/Zoan DF Appreciation Post/@comment-137.175.139.190-20151107214138

Kuma-Kuma no Mi Model Panda: This fruit allows the user to become a panda. Panda can use their claws for defense. Also, the user must constantly eat bamboo in order to keep the form in control or the panda side will become aggressive and attack its friends or allies.

Note: All bear based devil fruits can have this kind of side effect.

Other note: Oda has a gag character throughout the series called Pandaman