A new survey shows Americans are getting even fatter, with nearly 28 percent of people in the U.S. saying they're clinically obese, NBC News reported. Mississippi was the fattest state in the nation, with a full 35.2 percent of adults there saying they're obese, according to the new Gallup-Healthways poll. Obesity is already linked to higher rates of serious health problems, like heart disease, diabetes, some cancers, arthritis and Alzheimer's disease. And the damage goes beyond health: Obese adults are also more likely to say they lack purpose in life, and nearly 34 percent more likely to suffer financially than otherwise healthy adults, according to the poll. Among the top 10 healthiest states: California (4), Massachusetts (5), New York (8) and Connecticut (10).