Once again experts are passionately disagreeing about the proper role of saturated fats and carbohydrates in the diet. The latest volley comes from a full-scale critique  published in the BMJ  of proposed new US dietary guidelines. The author of the critique, Nina Teicholz,  is the author of The Big Fat Surprise: Why Butter, Meat, & Cheese Belong in a Healthy Diet. In both the…

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