Living in a city makes you fat, infertile, depressed

In 1900, only 14 percent of the global population lived in cities. In 2008 that figure leaped to 50 percent. By 2050, the United Nations predicts that 70 percent of people will be urbanites.
http://ummid.com/news/2011/November/22.11.2011/living_in_city_makes_u_fat.htm