Colorado is continuing its reign as the leanest state in the nation, with an obesity rate projected at 17.6 percent.
But overall, obesity rates climbed in 31 states last year, and no state showed a decline.
Mississippi became the first state to crack the 30 percent barrier for adult residents considered to be obese, with West Virginia and Alabama just slightly behind.
The figures come from the Trust for America's Health, a research group that focuses on disease prevention.
This year's report looked for the first time at obesity rates among children ages 10 to 17. The District of Columbia had the highest percentage at 22.8 percent. Utah had the lowest percentage at 8.5 percent.
The five poorest states were all in the top 10 when it came to obesity.