Food is an artifact type. Even though it appears on some creatures, it's never a creature type.

You can't sacrifice a Food to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate Maraleaf Rider's ability.

Whatever you do, don't eat the delicious cards.

Butterbur, Bree Innkeeper's ability checks if you control a Food at the beginning of your end step. If you do, the ability won't trigger.

If the ability does trigger, but you control a Food when it tries to resolve, the ability will do nothing. No Food will be created.