Who is the fattest of them all?

California is among the least-obese states in the nation with an obesity rate of 23.8 percent, the fifth lowest of all 50 states, a study finds.

A report by the Trust for America’s Health and the Robert Wood Johnson Foundation based on state obesity figures provided by the U.S. Centers for Disease Control and Prevention ranked Colorado as the fittest state and Mississippi as the most obese, according to Reuters Health. Of the 30 states with the highest obesity rates, 26 were in the Midwest and South. Obesity was measured using body mass index, a number determined by an individual’s weight and height.

“Obesity has contributed to a stunning rise in chronic disease rates and health-care costs. It is one of the biggest health crises the country has ever faced,” said Jeffrey Levy, executive director of the Trust for America’s Health.