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We don't need scientific studies to figure out what to eat. Just look at what has worked for millennia and avoid newfangled processed food.

Systematic evaluation of what has worked for millennia is science. If you mean just gathering unstructured anecdotes of uncertain provenance about the past and using them to construct just-so stories as guides, well, that's not particularly likely to be more useful than just randomly guessing what you should eat, though it's pretty close to how many diet fads get created.

All these dietary fads seemed to emerge around the same time as nutritional science.

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