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Q. I am fed up with medical flip-flops. Whether it is hormone replacement therapy, calcium supplements, eggs or salt, first we get told one thing and then doctors change their minds. In the meantime, we consumers are left wondering what to believe and whom to trust. I am still baffled by whether salt is as bad as I have always been told. We understand how hard it is to make sense of contradictory evidence from medical research. You are right that there have been major reversals...