Mark Zuckerberg, America’s youngest billionaire at 26, has not spent much money on himself. Forbes estimates his fortune at $6.9 billion, but Mr. Zuckerberg, chief executive of Facebook, has yet to sell any sizable portion of his holdings in the company.

He rents an unremarkable house within walking distance of Facebook’s headquarters here. He favors jeans and T-shirts, drives an Acura and, unlike many other technology moguls, does not own a private plane.

Sometimes, American restaurants unveil menu items that are so gluttonous that they seem to be trying to stun the senses. This was the case earlier this year with KFC’s much-discussed Double Down sandwich: two pieces of bacon, two slices of cheese and “Colonel’s Sauce,” with two thick filets of fried chicken functioning as the bun.

But compared with some chain restaurants’ offerings, the 540-calorie Double Down is almost health food. Many meals offered at these eateries are much worse, nutritionally speaking.

Below is a list of dishes that in just one sitting provide close to or more than the 2,000 calories recommended by the U.S. Department of Agriculture for an entire day’s sustenance. They also mostly stomp all over the recommended daily intakes for sodium (no more than 2,400 milligrams), fat (65 grams) and saturated fat (20 grams) for someone on a 2,000-calorie diet.