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Here are some of the most famous diets around the world:

1. The Crash Diet

A crash diet is a diet which is extreme in its nutritional deprivations, typically severely restricting calorie intake. It is meant to achieve rapid weight loss and may differ from outright starvation only slightly. They are not meant to last for long periods of time, at most a few weeks. Importantly, the term specifically implies a lack of concern for proper nutrition. Too much of this may cause anorexia nervosa.

2. The Detox Diet

Detox diet is a marketing term used to describe diets that are purported to detoxify the body, by removal of toxins or other contaminants. Proponents claim they improve health, energy, resistance to disease, mental state, digestion, despite a lack of supporting evidence, as well as aiding in weight loss. Many scientists, dietitians, and doctors, however, regard ‘detox diets’ as less effective than drinking a glass of water, and view ‘detox diets’ as generally harmless (unless nutritional deficiency results) but a waste of money.

“Detox” diets usually suggest that water, or fruits and vegetables compose a majority of one’s food intake. Limiting this to unprocessed (and sometimes also non-GM) foods is often advocated. Limiting or eliminating alcohol is also a major factor, and drinking more water is similarly recommended.

3. High Protein Diet

A high protein diet is often recommended by bodybuilders and nutritionists to help efforts to build muscle and lose fat. It should not be confused with low-carb diets such as the Atkins Diet, which are not calorie-controlled and which often contain large amounts of fat.

While adequate protein is required for building skeletal muscle and other tissues, there is ongoing debate regarding the use and necessity of high protein diets in weight training and bodybuilding. Various sources advise people to consume anywhere from 0.6 to 1.5g of protein per pound of bodyweight per day (1.4–3.3g per kg).

4. The Cambridge Diet

The Cambridge Diet is a range of nutritionally balanced weight management programmes ranging from 415 to 1500 kcal/day involving conventional food and Cambridge Diet products. The Cambridge Diet was developed in 1970 by Dr. Alan Howard at Cambridge University, England. It was first used exclusively in weight loss clinics, and then launched as a commercial product in the United States in 1980, with distribution in the UK beginning in 1984. The Cambridge diet became very popular in the United States in the 1980s, and the Cambridge company says it has helped over 15 million people lose weight.

The diet formula is intended to harness “the excellent weight loss properties of starvation”, while providing enough protein to protect lean tissue, the right level of carbohydrate to promote a mild ketosis (the body’s fasting mode, which burns body fat) and eliminate a sense of hunger, and the right levels of vitamins, minerals, trace elements and essential fatty acids to maintain good health.The meals are intended to combine all necessary food groups to satisfy a body’s nutritional needs, in order to allow a person to stop craving foods and overeating.

The company recommends eating only three of their pre-packaged meals a day (a total of 500 calories or less)for women under 5 feet 8 inches, and four meals for women over 5 feet 8 inches and men, for the fastest weight loss (called Sole Source) or combining their meals with some regular food for more gradual weight loss. The food consists of nutrition bars, shakes, oats, soups, or formulas in various flavors. Cambridge also recommends at least eight glasses of water a day.

The diet discourages alcohol, chewing gum, and high-energy exercises while on this diet.