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A third of the U.S. population is now overweight, making it just a matter of time before normal-size people are actually in the minority. Americans have so ballooned in size, government safety regulators worry that airline seats and belts won’t restrain today’s men who average 194 pounds and women who average 165 pounds, in a crash.

Not everyone agrees that obesity is always a health problem. You can be overweight and still have normal blood pressure, blood sugar, HDL cholesterol and other metabolic markers if you exercise, say some, pointing to U.S. Surgeon General Regina Benjamin, who hiked the Grand Canyon in 2010 despite her extra poundage.

But others say fitness and exercise will not reverse the health effects of obesity. The British medical journal The Lancet recently reported that rising obesity in the U.K. will cause an extra half a million cases of heart disease, 700,000 cases of diabetes and 130,000 of cancer by 2030. And the overweight and obese are 80 percent more likely to develop dementia writes Kerry Trueman on AlterNet.

And there are other obesity “negatives.” The obese are less likely to be employed, earn less than people of normal weight and “have more days of absence from work, a lower productivity on the job and a greater access to disability benefits,” reports the Paris-based policy group Organization for Economic Co-operation and Development.