How can we be obese?

It's a strange culture that idolizes anorexic women and astonishingly buff men while the "normal" population grows ever fatter and less fit. Diets keep getting worse, and people become more sedentary.
The American diet is particularly interesting. Here's a healthy place that serves a hamburger containing three pounds of meat. It comes with one pound of fries and provides a life-sustaining 7,000 calories. If you are really lacking sufficient fat in your diet but want to go a little lighter, you may want to try this one: a bacon-cheesburger sandwiched in a Krispy Kreme donut.
These guys seem to be going for the record: a fifteen pound burger.
Back when I lived in Michigan, I visited a place near the Detroit airport called the Wheat & Rye. It served a ham sandwich containing two pounds of ham. It was served on a huge roll, and was about the size of a bowling ball. If you could eat 3 (and survive the impending stroke), they would give you $1000 from the till. I didn't want the ham, so I ordered something called the "turkey club". When it arrived, it was the size of a shoe box and contained two pounds of ham PLUS a quarter pound of turkey. I didn't get far into that monster. The astonishing thing about the W&R was how cheap their sandwiches were. I think mine was less than 4 bucks. The proprietor must have owned a pig farm. I wonder if it's still in business?