Adult obesity rates increased in 28 states in the past year, and declined only in the District of Columbia (D.C.), according to F as in Fat: How Obesity Threatens America's Future 2010, a report from the Trust for America's Health (TFAH) and the Robert Wood Johnson Foundation (RWJF). More than two-thirds of states (38) have adult obesity rates above 25 percent.

In 1991, no state had an obesity rate above 20 percent.

"Obesity is one of the biggest public health challenges the country has ever faced, and troubling disparities exist based on race, ethnicity, region, and income," said Jeffrey Levi, PhD, executive director of TFAH. "This report shows that the country has taken bold steps to address the obesity crisis in recent years, but the nation's response has yet to fully match the magnitude of the problem. Millions of Americans still face barriers - like the high cost of healthy foods and lack of access to safe places to be physically active - that make healthy choices challenging."

The report also includes obesity rates among youths ages 10-17, and the results of a new poll on childhood obesity conducted by Greenberg Quinlan Rosner Research and American Viewpoint. The poll shows that 80 percent of Americans recognize that childhood obesity is a significant and growing challenge for the country, and 50 percent of Americans believe childhood obesity is such an important issue that we need to invest more to prevent it immediately.

The survey also found that 84 percent of parents believe their children are at a healthy weight, but research shows nearly one-third of children and teens are obese or overweight. Currently, more than 12 million children and adolescents are considered obese.

Additional key findings include:

• Adult obesity rates for Blacks topped 40 percent in nine states, 35 percent in 34 states, and 30 percent in 43 states and D.C.
• Rates of adult obesity for Latinos were above 35 percent in two states (North Dakota and Tennessee) and at 30 percent and above in 19 states.
• Ten of the 11 states with the highest rates of diabetes are in the South, as are the 10 states with the highest rates of hypertension.
• No state had rates of adult obesity above 35 percent for Whites. Only one state-West Virginia-had an adult obesity rate for Whites greater than 30 percent.
• The number of states where adult obesity rates exceed 30 percent doubled in the past year, from four to eight --Alabama, Arkansas, Kentucky, Louisiana, Mississippi, Oklahoma, Tennessee and West Virginia.
• Northeastern and Western states had the lowest adult obesity rates; Colorado remained the lowest at 19.1 percent.

Obesity is defined simply as too much body fat, according to the American Heart Association. Your body is made up of water, fat, protein, carbohydrate and various vitamins and minerals. If you have too much fat — especially around your waist — you're at higher risk for health problems, including high blood pressure, high blood cholesterol, diabetes, heart disease and stroke.

Waist circumference measurement and body mass index (BMI) are the recommended ways to estimate body fat. A high-risk waistline is 35 inches or higher for women, and 40 inches or higher for men. A BMI of 30 or higher indicates obesity. This translates to about 30 pounds or more overweight. A BMI between 25 and 29.9 is considered overweight.