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Diet is the sum of food consumed by a person or other organism. As described in many books - dieting is the careful selection of food to control the weight of the body and nutrient intake.

Most popular books about diets are "In Defense of Food: An Eater's Manifesto", " Skinny Bitch: A No-Nonsense, Tough-Love Guide for Savvy Girls Who Want to Stop Eating Crap and Start Looking Fabulous!" and " The South Beach Diet".

Dietary habits are the characteristic decisions of a culture makes when choosing what food to eat. The term diet implies the use of specific intake of nutrition for health or weight management reasons. Each person holds some food preferences. This may due to the ethical reasons of the culture. The nutrition needs absorption of fiber, minerals, vitamins, and food energy in the form of proteins, fats, carbohydrates and vegetable oils. For the quality of life, health and long life, dietary habits play a significant role. Some religions have various restrictions regarding what foods are acceptable in their diet and what foods are not acceptable. For instance, Buddhists are generally vegetarians.

Most of the people select to omit food from animal sources to varying levels for health reasons, issues or to reduce their personal impact on their surroundings. Raw foodism is an important trend followed by various nutritionists. Mostly people follow diet for weight loss or weight gain. Maintaining diet alters the energy balance and increase or decrease the amount of fat stored by the body. Generally diets are frequently recommended in conjunction with exercise.

Some weight loss programs can be harmful to health some may be beneficial. By having a healthy diet, there is a way of preventing health problems. They may provide the body with the proper balance of vitamins, proteins, minerals and other nutrients. The eating disorder is a mental disorder that restricts with normal food consumption. It is otherwise defined as the abnormal eating habits that involve excessive diet.

A healthy diet is always for maintaining the optimal health. It is highly recommended to eat plant based food, limit meat and alcohol. Carbohydrates are digested for providing energy to the body. Proteins are used for the construction of muscle cells. Fatty acids are required for construction of cell membrane and brain construction. The importance of eating a balanced diet includes all the essential nutrients. Drinking sufficient amount of water is very much helpful to eliminate fat and toxins. In a healthy diet, fried foods, junk foods, alcohol, sweets should be avoided. To reduce weight nutritionists recommend the importance of avoiding saturated fats. They also agree on the importance of reducing salt intake. Commercial foods such as snacks, biscuits and bread contain salt. They contribute the intake of excessive salt.