求翻译：The notion that you could lose weight by cutting out carbohydrates and eating plenty of protein was once tut-tutted by the medical establishment partly because such diets were based on little more than interesting ideas and speculation.In the past two years,head-to-head trials that pitted high-protein,low-carbohydrate diets against low-fat,high-carbohydrate diets have given them a scientific leg to stand on.是什么意思？

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