Hopefully this isnt considered cheating......if it is, please feel free to remove the post.
If your tribe is on the verge of starving, there is a way to keep it from happening. Scroll down to see......
The Tribal Chief can make magic food every 24 hours. If you pause your game, and ONLY turn it back on long enough for him to make food each morning...it will build up a food supply to help get you through till you can get enough tech points for other sources.
I figured this out kind of by accident. None of my villages are close to starving, but I havent had much time to play the game recently. But I load it each morning for a few minutes to have to Chief teach the kids, and figured out I can get the food also.