It's a calorie-restricted keto diet most commonly used to treat cancer . Studies have shown that calorie restriction and ketosis can help manage and even treat cancer . That's because cancer cells need massive amounts of glucose and lactate to grow and they cannot use ketones for energy. In essence, the keto diet starves cancer cells. Besides restricting carbs below 20-50 grams, this diet also limits calorie intake.
Here are some studies examining RKD and cancer:
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