A 35-year-old woman has gained 20 kg weight within a year with the normal diet. She complains of chills, sleepiness, shortness of breath. The patient's mother and sister are corpulent. Objectively: height - 160 cm, weight - 92 kg, BMI- 35,9. Obesity is uniform, there are no striae. The face is amimic. The skin is dry. The tongue is thickened. Heart sounds are muffled. HR- 56/min, BP-140/100 mm Hg. The patient has been suffering from amenorrhea for 5 months, has constipations. TSH- 28 mclU/l (norm is 0,32-5). Craniogram shows no pathology. What is the etiology of obesity?