Vowing to go to the fast food giant three times a day, Morgan limited herself to 1,400 calories a day. The first meal of her diet would be a sausage burrito and medium diet coke. For the most part, Morgan eats burgers and salads. She only gave into eating the salty French fries two times over the 90-day period.

Another woman from New Hampshire also made every meal a happy one, thus limiting herself to 2,000 calories a day. She lost a grand total of 36 pounds.

But the McDonald's Diet is really anything but a novel idea. Don Gorske holds the Guinness World Record title for eating the most Big Macs, having gobbled down more than 19,800. Since 1972, he has consumed up to nine of the burgers a day. But it hasn't affected his waistline. He's six-feet-tall and weighs 180 pounds. His cholesterol is also good.

However, that is not the case for everyone who follows the golden arches to attempt to lose weight. Super Size Me author Morgan Spurlock ate at McDonald's three times a day for 30 days. By the end of his fast food stint, he had packed on 25 pounds while his health had seriously deteriorated.