“The fundamental premise of the healthy migrant hypothesis is that the process of migration is not random,” says Christopher P. Salas-Wright, the study’s author. Instead, “individuals who are inclined to migrate, and able to do so successfully, are part of a uniquely healthy and psychologically hardy subset.”
Essentially, immigrants appear to be healthier because only the healthy are capable of immigrating. Unhealthy individuals either lack the ability or desire to leave their home countries, while healthier individuals who voluntarily decide to immigrate better handle the stresses of doing so and are more mentally resilient in general.
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