Stone Age Food Strategy
The best way to feed your people, is to make sure you have just enough food.

Sure you can feed them other resources, but those resources will cost you at least 50% more (in terms of dice eyes). It's a lot easier to just get the food out.

Food is a means to an end, it won't score you any points. As the game develops, you can see where your chances of scoring big points are. Use this focus to determine how to get your food. If you get farmer (civilization) cards it makes sense to focus on getting high on the food track. In my experience, this can lead to having lots of excess food at the end of the game, which feels like a wasteful investment.

I've also won games without focusing on the food track, instead focusing on getting more people and sending them out to hunt. Again, if you overdo this you will run out of food.

All in all, there is no undisputed best solution, without considering the cards on the table and the choices of your fellow players.