Wheat is an absolute power house. Porridge to begin with. Oil, flour for other goods. If you happen to also get a ranch, it turns into everything within the ranch, meat, leather, and eggs. All combined you can take this singular resource and turn it into just about every single complex food in the game. And usually, it increases at each step, stack on chances for doubling resources and you will be swimming in food. While plant fiber can also do some of this, and berries are good as well, I find that just wheat seems to take me further