Citizens of the world's richest countries are getting fatter and fatter and the United States is leading the charge, an organization of leading economies said Thursday in its first ever obesity forecast.

Three out of four Americans will be overweight or obese by 2020, and disease rates and health care spending will balloon, unless governments, individuals and industry cooperate on a comprehensive strategy to combat the epidemic, the study by the Organization for Economic Cooperation and Development said.

The Paris-based organization, which brings together 33 of the world's leading economies, is better known for forecasting deficit and employment levels than for measuring waistlines. But the economic cost of excess weight — in health care, and in lives cut short and resources wasted — is a growing concern for many governments.

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