Those contrasts are STARK to say the least...
By Region:
In 2012, BMC Public Health reported the following average weights by region. The averages were calculated using data from 2005, and relied on combined statistics for men and women:
North America: 177.9 pounds
Oceania, including Australia: 163.4 pounds
Europe: 156.1 pounds
Latin America/Caribbean: 149.7 pounds
Africa: 133.8 pounds
Asia: 127.2 pounds