The diet is named after the ketogenic metabolic state, which it aims to put the body in.
This is when the body uses fat as its primary source of energy, not carbohydrates, which is the natural metabolic state for mammals.
Carbohydrates are, basically, sugar, so the keto diet is a diet with very, very little sugar.
So, sweet snacks are more difficult to make on the keto diet than savoury ones, as the diet eliminates sugar.
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