They're known for having the 'healthiest hearts ever studied', but now an Amazonian tribe may also hold the key to slowing down ageing.
The Tsimane indigenous people of the Bolivian Amazon experience less brain atrophy as they age than their American and European peers, researchers have found.
It suggests that sedentary lifestyles and diets rich in fats and sugars could be making people in industrialised nations more vulnerable to Alzheimer's disease.
By contrast, the 16,000-strong tribe are extremely active, traditionally hunting and foraging for their own food, and consume a high-fibre diet of vegetables, fish and lean meat.
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