Ketosis is a normal metabolic process. When the body does not have enough glucose for energy, it burns stored fats instead; this results in a build-up of acids called ketones within the body. Some people encourage ketosis by following a diet called the ketogenic or low-carb diet.
Sorry, had no idea, until I read Jerry S. Answer, you learn something new eveeyday!!!
Jerry offered a great detailed response. It's a low-carb diet or way of eating.
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