7 Fad Diets You Shouldn't Try

— -- intro: Every day it seems a new diet is ready to make weight loss faster and easier than ever before. Or at least they say they are.

"Most fad diets go something like this: Take a few foods, give them 'magic' power, and set a plan to convince people that eating this way and only this way will promote weight loss," says Alexandra Caspero, RD, a nutritionist based in Sacramento, Calif.

The following diets might spur short-term weight loss, but many are difficult to follow, have arbitrary rules, and a few could put your health in danger.

quicklist: 1category: Fad Diets You Shouldn't Trytitle: The raw food dieturl:text: Any weight-loss expert would agree that boosting your veggie and fruit intake while reducing the amount of junk you eat is a safe and effective way to lose weight, but this diet bans foods that have been cooked or processed in any way. Why? Raw foodies say cooking destroys nutrients.

Though it's true that cooking produce can sometimes reduce nutrient levels, cooked veggies still pack plenty of fiber, vitamins, and minerals, and in some instances cooking actually enhances nutrients while also killing bacteria.

The biggest issue with this extreme form of veganism? Food prep—it's totally impractical, says Christopher N. Ochner, PhD, director of research development and administration at the Mount Sinai Adolescent Health Center. Raw foodies spend hours upon hours juicing, blending, dehydrating, sprouting, germinating, cutting, chopping, and rehydrating.

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quicklist: 2category: Fad Diets You Shouldn't Trytitle: Alkaline dietsurl:text: The alkaline diet—also known as the alkaline ash diet and the alkaline acid diet—requires you cut out meat, dairy, sweets, caffeine, alcohol, artificial and processed foods, and consume more fresh fruits and veggies, nuts, and seeds.

The diet certainly has positive points; it's heavy on fresh produce and other healthy, satisfying foods while eliminating processed fare, which in itself may spur weight loss. But your body is incredibly efficient at keeping your pH levels where they need to be, so cutting out these foods really won't affect your body's pH, says Ochner. Not to mention there's no research proving that pH affects your weight in the first place.

The bottom line: the diet is strict, complicated, and bans foods that can have a place in a healthy eating plan, such as meat, dairy, and alcohol.

quicklist: 3category: Fad Diets You Shouldn't Trytitle: The Blood-Type Dieturl:text: Developed by naturopathic physician Peter D'Adamo, the Blood Type Diet is based on the notion that the foods you eat react chemically with your blood type.

For example, on the diet, those with type O blood are to eat lean meats, vegetables, and fruits, and avoid wheat and dairy. Meanwhile, type A dieters go vegetarian, and those with type B blood are supposed to avoid chicken, corn, wheat, tomatoes, peanuts, and sesame seeds.

However, there's no scientific proof that your blood type affects weight loss. And depending on your blood type, the diet can be extremely restrictive.

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quicklist: 4category: Fad Diets You Shouldn't Trytitle: The werewolf dieturl:text: Also called the lunar diet, this one is simply fasting according to the lunar calendar.