Unfortunately, in practice, the opposite is true. We grow food, such as grains, just to feed it to cattle which has 1% of the calorie efficiency. For example i

Unfortunately, in practice, the opposite is true. We grow food, such as grains, just to feed it to cattle which has 1% of the calorie efficiency. For example in the EU 63% of arable land is used to grow animal feed rather than food directly for humans.