The idea that mesolithic communities (in Ireland at least) lived on mainly meat is from findings which are very scant.
Hardly any berries/seeds have been found in association with mesolithic sites, but zillions of bones have. In fact the number of animal bones actually contradicts the 'small population' theories from this period.
It is also known that organised arable farming was not introduced until much later and it is *assumed* therefor that the diet changed considerably at this point in time. Life spans seem to be similar but tooth decay is greatly increased probably through higher carbohydrate intakes.
Of course this is all subjective anyway and I am just as guilty of poo-pooing research from other areas.
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