My villagers have harvested all of the honey and bannana's from my fruit tree and they have 99 food left, maybe less since I've logged out of the game. What else can they do for food? I have only had enough tech points to get to level 1 nature... is my tribe done for?

Here in the same forum, there is a thread that may help you/them!
It's in Forums List » Windows/Mac Games (and Palm/Pocket PC) » Virtual Villagers 3: The Secret City » My villagers are dying!! What am I doing wrong?

And I recommend you, in Forums List» The Guides » Virtual Villagers 3: The Secret City Guide » [SPOILERS] Guide to getting food in VV3