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Kind of; humans do adapt remarkably well to low-glucose diets, and we can produce glycogen without sugary inputs via gluconeogenesis. They do make it much easier, though.

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Well you need some substrate which can be metabolized into sugar, such as carbohydrate or protein.

Definitely. I was only responding to the statement that sugar is a necessity for energy if you’re moving around a lot. You can do this without sugar.

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