1. Go someplace where bananas, potatoes, and perhaps other fruit/veg (I dunno) have spawned. This may be hard, as they are INVISIBLE. But you devs are very clever souls, I'm sure you can figure out how to make it happen.
2. Notice how they can't be seen at all.
3. Now hit "TAB" and look on the left.
4. Hey, an empty item box on the left! Right-Click it.
5. You should have the option to eat it, etc... because it's fully functional. Just invisible.