0:30

Alberto Viloldo, a medical anthropologist, says the brain is 70% fat and humans grow a new brain every 20 days. He contrasts dementia rates in the Amazon with America and argues that serotonin repairs the hippocampus, but modern people are serotonin-deprived.

Questions this video answers

One out of 100 people (1%).

One out of 5 people (20%).

70%.

Every 20 days.

Serotonin.

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