Obesity rates are rising 。 Body weight in the U.S.has been rising in fits and starts for at least the past 150 years. The proportion of adult Americans who are obese has more than doubled between 1977 and 2006. Body weight has been increasing for decades in every developed country in the world. The heaviest countries are all in the Anglosphere. Bhattacharya,Hyde and Tu-HealthEconomics Bhattacharya, Hyde and Tu – Health Economics Obesity rates are rising • Body weight in the U.S. has been rising in fits and starts for at least the past 150 years. • The proportion of adult Americans who are obese has more than doubled between 1977 and 2006. • Body weight has been increasing for decades in every developed country in the world. • The heaviest countries are all in the Anglosphere