What is dieting?

Dieting is a practice of eating food in regulated order to decrease, maintain or increase body weight. Physical exercise is usually combined with dieting in order to loose weight in those who are overweight or obese.
Some athletes, however, follow a diet to gain weight (usually in the form of muscle). Diets can also be used to maintain a stable body weight.
Diets are usually divided into 4 categories: low-fat, low-carbohydrate, low-calorie and very low calorie. There is actually no big difference between these four. The point is, whichever diet you choose, exercise, exercise and more exercise, or no diet can help you.

Types of diets
Low-fat diets: Low-fat diets help the reduction of the percentage of fat in one's diet. Having these types of diets reduce calorie consumption because less fat is consumed. A meta-analysis shows that low-fat diets resulted in average weight loss of 3.2 kg (7.1 lb) over habitual eating.
Low-carbohydrate diets: Low carbohydrate diets such as Atkins, Dukan, Eco-Atkins, Medifast are relatively high in protein and fats. Low-carbohydrate diets also produce ketosis, but if properly designed, they enable the body's nutritional needs to be met by dietary protein, dietary fat, stored body fat, and stored glycogen, so that body muscles are spared.
Low-calorie diets: Low-calorie diets usually produce an energy deficit of 500–1,000 calories per day, which can result in a 0.5 kilogram (1.1 lb) to 1 kilogram (2.2 lb) weight loss per week. These diets lowered total body mass by 8% in the short term, over 3–12 months.
Very low-calorie diets: Very low calorie diets provide 200–800 calories per day, maintaining protein intake but limiting calories from both fat and carbohydrates. These diets are not recommended for general use as they are associated with adverse side effects such as loss of lean muscle mass, increased risks of gout, and electrolyte imbalances. People attempting these diets must be monitored closely by a physician to prevent complications.
Calorie counting: Calorie counting diets means recording the nutritional value of every morsel of food that goes into your mouth. Calorie counting is based on the idea that in order to lose weight, you must be eating less "energy" than you burn off . Basically, our bodies convert the calories ingested from food into sources of fuel. However, if a person eats more calories than they actually need, the metabolism process slows down and those calories end up being stored as fat. While metabolism is a very complex process, calorie counting is one way that dieters try to monitor their calorie intake.
Detox diets: Although detox is primarily thought of as a treatment for alcohol or drug dependence, the term is also used to refer to a program of diet, herbs, and other methods of removing environmental and dietary toxins from the body.There are many different types of detox diets.

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