Comment by nonameface

This was answered a lot already, but I'll go into a little more detail. They eat both.

Pollen = Protein

Nectar/Honey = Carbohydrates

Just like most other living animals they need both to survive.

Honeycomb holding Pollen -- the multicolored cells are pollen, actually something called "bee bread" if you need a keyword to read more about it. https://s-media-cache-ak0.pinimg.com/564x/c2/65/36/c26536d91...

This image shows a comb with pollen in the bottom left, uncapped honey/nectar in the central area. This uncapped nectar has too much water in it still and will ferment, and capped honey in the top right section. This capped area is true honey that has been dehydrated enough to not ferment and spoil. http://thumbs.dreamstime.com/z/honeycomb-fresh-honey-pollen-...