If you were to follow a McDonald's diet, there are plenty of options on the menu a bit more healthy than the typical burger and fries. A Honey Mustard Snack Wrap with Grilled Chicken will set you back only 260 calories and 9 grams of fat. The Southwest Salad with Grilled Chicken comes in at 320 calories and 9 grams of fat, while the fruit 'n yogurt parfait has just 160 calories and 2 grams of fat.

So although there are some healthy choices, the notion of a McDonald's diet still should rightfully raise a red flag for many health experts. It may sound enticing yet nutrition experts are not buying it.

Registered dietitian Dawn Jackson Blatner says that while a McDonald's-only diet might help take off the pounds -- it will not keep them off. There is simply not enough variation to stick to the diet long-term.