The human body is divided into "sugar metabolism" and "ketone metabolism," both of which can support bodily functions. Sugar metabolism uses glucose as fuel to provide energy, while "ketone metabolism" uses ketones as energy.

The cost of sugar metabolism is very low, whereas ketone metabolism involves eating meat and picking berries, and hunting, livestock farming, and foraging are inefficient and costly;

After humans domesticated rice and grains, they primarily relied on "sugar metabolism" because it has a low cost. It was precisely because rice and grains were domesticated in Egypt and the Mesopotamia that "slave societies" arose; otherwise, they could not sustain so many slaves;

There is nothing wrong with sugar metabolism, but it requires a lot of physical labor every day; otherwise, problems will arise;

There is an ancient Chinese saying: "The rise and fall of the world is the responsibility of every man, the rise and fall of a nation is determined by those who eat meat," which means only the nobles eat meat, while ordinary commoners can only eat grains;

The Huangdi Neijing starts by saying: "Humans eat grains; how can they not get sick?" Previously, it was thought that this meant getting sick is normal. Now it is understood that it is eating grains that makes one prone to illness; not eating grains would prevent it. Therefore, Taoism emphasizes not consuming smoke and fire, where smoke and fire refer to grains;

However, transitioning from "sugar metabolism" to "ketone metabolism" is difficult for modern people. Once in a state of ketosis, even eating carbohydrates once—a reference to grains—will cause one to exit the ketogenic state, and it will take at least two days to recover!

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