Great Gut Extinction: Has modern life destroyed our health?

Great Gut Extinction: Has modern life destroyed our health? http://www.bbc.co.uk/news/health-32543176

Still finding new human cultures!
Imagine all the animals and plants we know not yet about (many killed off before we can catalog them). Huge diversity in Amazon forest.

Bacterial diversity much richer in isolated tribes. As they interact more with, and become more modern, the diversity goes down.
Could this be the reason for “modern diseases” that indigenous cultures don’t experience?
Is there a way to reintroduce said (gut and other) bacteria into the non-indigenous humans to counteract mitten society and diets. Could that then prevent diseases of modern society, such as cancer, depression, diabetes, arthritis?

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