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Low‐carbohydrate diets are being widely recommended, but with apparently conflicting evidence. We have conducted a formal systematic review of the published systematic reviews of RCTs between low‐carbohydrate vs. control (low‐fat/energy‐restricted) diets in adults with overweight and obesity. In MEDLINE, Embase, Web of Knowledge and Cochrane Database of Systematic Reviews, searched from inception to September 2017, we identified 12 systematic reviews, 10 with meta‐analyses. Differences in methods, study quality, weight change and citations of published systematic reviews were assessed by AMSTAR‐2. Review methods varied in definitions of low‐carbohydrate diet, databases searched and bias assessment. Overall review quality was high in two, moderate in three, critically low in seven. Among meta‐analyses, 4/5 with critically low quality showed low‐carbohydrate diet superiority for weight …