Surely the species of most foods available nowadays are only a couple centuries or decades old?
Plus there's survivor bias: just because population A survived on food X, doesn't mean it won't halve the life expectancy when introduced to population B. E.g. high calory foods in the oceania populations caused obesity.
Plus there's survivor bias: just because population A survived on food X, doesn't mean it won't halve the life expectancy when introduced to population B. E.g. high calory foods in the oceania populations caused obesity.