The majority of food consumed was unprocessed, unlike it is now. You will find that the chemical diversity in a fish and some veg are higher than in say cookies or pasta.
The diet itself was not particularly diverse, but it was mostly based on veg, whatever you could forage and a little bit of meat here and there. Famines and etc were also common.
Also, individuals who did have higher nutritional requirements from allergies, etc didn’t really meet them. They died.
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