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Global Journey
2,500
40,000
60,000
Some migrants interbred with Neanderthals 
and Denisovans
Modern humans left Africa and migrated around the globe
200,000
A BRANCH OF THE
HUMAN FAMILY SPLIT
 700,000
years ago
Humans diverged 
from apes
6 million
years ago
Obesity
Sickle Cell Disease
Chronic Kidney Disease
Autoimmune disorders
Migraines
Skin Cancer
High Blood Pressure
TYPE 2 diabetes
Low Blood Sugar
As human populations spread around the globe, genetic changes that helped them survive in new environments also laid the foundation for new diseases.
How Illness Emerged from Adaptation

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