Lactose tolerance a key to evolution?

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Lurkie (May 29, 2011, 17:38:25 PM):
Are you aware of instances where populations have gone into natural decline because of an abundance of food? I don't mean soil that is too rich for certain plants.

No, I've never seen any references to this. I could flippantly suggest that the US, UK and many other developed countries, which are in the grip of an obesity epidemic, are examples.

There are well documented examples of the opposite effect though. There's an area in Japan where the population consumes less (about 20% less) food than the Japanese average because of cultural reasons. This group has a higher than normal population of oldies reaching the 100 year mark.

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