(AP photo/Seth Wenig)

No one really knows why people in the United States are getting so much fatter so quickly.

Some laugh and say the reason is obvious — too little exercise and too many french fries.

Others have wondered if some other factor, such as toxic chemicals, might not play a role.

One thing is clear: The increase in obesity is going hand in hand with a rise in diabetes and other conditions that are adding to health care spending today and could eventually lead to deterioration in disability insurance morbidity and life insurance mortality experience.

Now Gallup has come out with a new poll indicating that the U.S. adult obesity rate may have jumped to 27.2 percent this year, from 26.2 percent in 2012.

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