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My guess is that science will eventually find that each person responds differently to various diets. Some people can't digest dairy very well, or don't handle a jolt of simple sugars (diabetic) very well. We metabolize things differently, and finding a healthy diet doesn't have much to do with following what works well for someone else.
One day we will have our personalized genome mapped, and that will get us closer to an ideal diet tailored just to our needs. Until then, the best we can do is trial and error.
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