Ketosis and ketones what are they..When in a ketotic state, carbohydrate intake is so low that the body shifts over from burning glucose as a primary source of fuel to using fat and its own fat stores for energy. Essentially, when in ketosis you become a “fat burner” instead of a “sugar burner.” Our ancestors remained in ketosis during the cold season, eating a low-carbohydrate diet of mostly meat and lots of quality fat, and then naturally shifted out of ketosis in the summer due to the consumption of plentiful seasonal produce.

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