As a result of prophylactic medical examination a 35-year-old woman was diagnosed with alimentary and constitutive obesity of the III-degree. It is known from her anamnesis that the patient doesn't observe rules of rational nutrition: she often overeats, the last food intake is usually 10-15 minutes before going to bed, prefers fattening and rich in carbohydrates food. What is the main alimentary risk factor of obesity development?