Obesity rates for the USA: http://www.niddk.nih.gov/health-information/health-statistics/Pages/overweight-obesity-statistics.aspx http://www.niddk.nih.gov/healt

Obesity rates for the USA: http://www.niddk.nih.gov/health-information/health-statistics/Pages/overweight-obesity-statistics.aspx http://www.niddk.nih.gov/health-information/health-statistic... Percentages of adults within these categories [Overweight, Obese, Extremely obese] increased gradually until the late 1970s, at which point they began to climb more quickly, leveling off somewhat around 2000. (Scroll down to the section titled "Trends in Overweight and Obesity among Adults, United States, 1962–2010")