Obesity is a chronic disease that is constantly increasing and is among the main causes of death and disability in the world. The basis for successful treatment of obesity is a change in the patient's lifestyle, an increase in physical activity and a change in diet. The patient should be educated and set certain goals for himself during the weight loss period and know the importance of weight loss. Today, there are different types of diet therapy that help in losing weight, but which are also recommended for further life, such as the Mediterranean diet, which is based on the quality and not the quantity of food. Obesity can also be treated with medication and bariatric surgery. The goal of bariatric surgery is weight loss and maintenance. After bariatric surgery, the patient should follow certain guidelines depending on the type of surgery being performed and conscientiously consume the recommended foods. It is also important for the patient to remain motivated to lose weight and to include physical activity in the weight loss process.