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This guide is written by Dr. Andreas Eenfeldt, MD, Jill Wallentin, Dr. Bret Scher, MD and was last updated on March 27, 2023.
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The idea that fewer carbs is usually more effective for weight loss and type 2 diabetes reversal is mainly based on the consistent experience of experienced practitioners, and stories from people trying different levels of carb restriction [weak evidence]
The only intervention study – to our knowledge – that compared different levels of carb restriction was a small trial that found trends towards greater weight loss and greater improvements in cardiometabolic risk factors as carb intake went lower.
PeerJ 2019: Low-carbohydrate diets differing in carbohydrate restriction improve cardiometabolic and anthropometric markers in healthy adults: a randomised clinical trial [moderate evidence]
The lower the carb intake, the more glycemic control appears to improve:
Journal of the American Dietetic Association 2008: Restricted-carbohydrate diets in patients with type 2 diabetes: a meta-analysis [moderate evidence, downgraded as it’s comparing effects between different low-carb trials. There is no RCT comparing low carb to lower carb.]
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