Many types of diets exist in the market, not all of which can be covered here. However, some examples include the 3-Hour Diet, the Atkins Diet, the South Beach Diet, the Zone Diet, the Caveman Diet, the Cabbage Soup Diet and Grapefruit Diet. These diets variously limit portion size, fats or carbohydrates or focus on specific foods or types of foods, according to Healthline.
Certain diets are based upon portions and mealtimes. For example, the 3-Hour Diet requires eating smaller portions every three hours, rather than one large meal in the morning, afternoon and evening. All types of foods are allowed in moderation.
Other diets focus on the relative balance of carbohydrates, proteins and fats. The Atkins Diet encourages dieters to eat lean proteins and vegetables. Carbohydrates, such as those found in flour and sugar, should be avoided. The theory is that consuming fewer carbohydrates allows the body to burn more fat. The South Beach Diet requires users to replace "bad carbs" and "bad fats" with "good" versions. The Zone Diet suggests that dieters should eat a standardized mix of carbohydrates, protein and fat every day.
Then, there are diets that focus on specific classes of food to eat. The Caveman Diet is based on eating foods that existed during the Paleolithic era. In other words, dieters are only to eat foods that humans ate prior to farming and domesticating animals, with the goal being to get the body to crave healthy foods.
The Cabbage Soup Diet involves eating quite a bit of cabbage soup to achieve quick weight loss. According to Healthline, the diet claims one can drop 10 pounds in just a week and is promoted as a "vanity diet." The Grapefruit Diet requires dieters to eat grapefruit with every meal.