What's the diet therapy for treatment of obesity?

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Dietary therapy involves instruction on how to adjust a diet to reduce the number of calories eaten. Reducing calories moderately is essential to achieve a slow but steady weight loss, which is also important for maintenance of weight loss. Strategies of dietary therapy include teaching about calorie content of different foods, food composition (fats, carbohydrates, and proteins), reading nutrition labels, types of foods to buy, and how to prepare foods. Some diets for weight loss include low-calorie, very-low calorie, and low-fat.
For many people it may be beneficial to reduce their calorie intake by eating less and eating more healthily. It is not necessary to crash diet. This usually ends up with the person concerned either getting weaker or giving up completely in desperation. This in turn can lead to a yo-yoing effect of the weight loss - weight gain cycle. Cut down on fatty foods and eat more bread, fruit and vegetables.

Two main types of dietary therapy are a low calorie diet (800–1500 kcal daily), and a very low calorie diet (less than 800 kcal of energy daily), which usually consists of a protein-enriched liquid. Energy consumption must be reduced. High calorie/low volume foods should be avoided and replaced with an increase in complex carbohydrates (such as whole grain foods) and an increase in fruit and vegetables. A reduced fat intake is also an important element of a balanced healthy diet.
Very low calorie diets are not advisable in children and they are not effective. Eating 300 to 500 calories less per day, may lead to losing between one and two pounds per week. This is a realistic weight loss. It may seem slow, but would add up to a weight loss of more than three stone in a year.

Having a glass of water instead of juice, eating less lunch than usual and having smaller portions of the food you enjoy are all ways to reduce calorific intake without having to necessarily alter your diet significantly. Avoid a second helping at dinner and snacks between meals, which may have become a habit. Cut down on beer and alcohol. All these things will influence your health in a positive way.