From beer to cronuts, Americans can't get enough if our national obesity problem is any indication. But a new study reveals many of us are in denial about our health—and are actually less healthy than we perceive.

In a study commissioned by Aetna, the insurance giant measured everything from how we rank our health compared with other generations—to why some of us exercise at all: To look good in our underwear.

"There is a disconnect," mused Keri Gans, about the study's participants. "It's surprising."... Read More: CNBC