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Take two people who say they're "on a low-carb diet." One eats salmon, avocado, walnuts, and steamed broccoli. The other replaces pasta with bacon, processed cheese, and fried chicken without bread. Statistically, they're in the same study category. Cardiovascularly, they're in opposite universes. This is more or less the picture emerging from the new, massive Harvard study published in the Journal of the American College of Cardiology: 198,473 …