10 Celebrity Fad Diets Slideshow

Celebrities like Beyoncé have been known to try this liquid and laxative diet to drop pounds quickly. Essentially a 14-day fast that involves a diet of fresh lemon juice, maple syrup, cayenne, and water (plus a laxative in the morning and at night), it is meant as a juice detox diet and has spurred other less-intensive juice diets like the BluePrint Cleanse. If you do try this, be careful the first day and make sure you stay close to a bathroom (there are some not-so-great stories out there).

One diet trend in Hollywood is to follow the way of toothless babies — eating mashed and puréed foods. Created by celebrity trainer Tracy Anderson, the Baby Food Diet promises weight loss, curbed cravings, and easy, mobile eating. Baby food is substituted for one or more meals a day so that higher caloric snacks are replaced with lower calorie baby foods that come in fixed portions. Seem a little immature? Not to stars like Jennifer Aniston and Reese Witherspoon.

The Grapefruit Diethas been around since the 1930s and still finds popularity among Hollywood stars like Kylie Minogue and Brooke Shields who are looking to drop weight fast. Allegedly, when grapefruit is eaten with protein it triggers fat burning and thus quick weight loss. The diet is recommended for 12 days to achieve the ideal 10-pound weight loss, but it does not promise any long-term changes. Though there are variations on the diet, overall it encourages a low-carbohydrate, low-calorie, and more protein-heavy diet with plenty of fresh grapefruit juice and absolutely no snacking between meals.

For quick weight loss, stars like Sarah Michelle Gellar have turned to this seemingly monotonous diet. The supposed benefits are that you will lose up to 10 pounds in just seven days on this low-fat, high-fiber diet so that you can kick-start your way into a new healthy, long-term diet plan (this is not one and doesnt claim to be). The problem, though, is that you really have to love cabbage soup and be able to put up with eating a lot of soup they say the more you eat, the more you lose.

In this unique diet, each day is assigned to eating foods of a different color: Monday is white, Thursday is orange, and Sunday is the day of rainbow-colored foods, just to name a few. While no specifics are mentioned other than the color requirement, it is stressed that healthy foods are encouraged. Reportedly, Christina Aguilera is a fan of this multi-colored and challenging diet. While it doesn't promise weight loss, it is said to encourage more awareness about the foods that we are eating and to expose dieters to the wide array of food available.

Before Shape-ups and QuickTrim, reality star Kim Kardashian tried out the sweet-sounding Cookie Diet. Unfortunately, these aren't the gooey, chocolate-chip cookies that you might be thinking of, although they supposedly don't taste all that bad. The diet is believed to have been originated by Dr. Siegal, a Miami-based doctor who developed a cookie formula in 1975 that helped patients lose weight. The cookies are filled with amino acids and supposedly suppress hunger, are full of fiber, and help slow down digestion so that you feel full longer. The diet also consists of lean protein and vegetables for dinner plus six to eight cookies a day — that comes to about 800 to 1,500 calories per day.

Followed by actress, now cookbook author, Gwyneth Paltrow for a while, the macrobiotic diet also has devotees like Madonna subscribing to its plan. What's the deal? No processed or refined foods and little (if any) animal products, with a heavy focus on grains and local vegetables and fruits. This high-fiber diet is also popular among people who believe that it will cure diseases and illnesses, but that has not been proven.

A celebrity fitness trainer, Michael George, recommended this healthy rainbow diet to clients like Reese Witherspoon. The diet consists of eating more fruits and vegetables on a daily basis by trying to eat at least one or two servings from each color group of produce. For example, asparagus would fall under green, and oranges under, well, orange. (You get the idea.)

Dr. Peter D'Adamo, author of Eat Right for Your Type, wrote his book advising people to eat based on theirblood types, which he says will help prevent diseases like cancer or heart disease. Though it's not intended as a weight-loss diet, celebrities like Jennifer Lopez, Elizabeth Hurley, and Gwyneth Paltrow have been known to try it out.

Apparently, eating every three hours from when you wake up until three hours before bed (including three meals and two snacks) means that you can drop two pounds in one week. Or at least that's what trainer Jorge Cruise says. He claims that it's less about bad and good foods than it is about timing and servings. While he's not really selling me, stars like Jessica Biel and Heidi Klum have tried out this appetizing advice.