The observation covers 123 patients (30 males and 43 females). Serum cholesterin and triglycerides of the patients were investigates. All the patients have been put stereotype questions about the preferred kind of main food, body weight changes and nutritional rhythm especially at an early age. The smokers and alcohol consumers were registered. The patients were subdivided into four groups according to their answers: I-without manifested preference to a special type of main food; II - with preference to protein food; III - to carbohydrate and IV - to fats. The formed groups were also characterized by the indices: changes in body weight, nutritional rhythm, body weight above the norm, smoking and alcohol consumption. The results obtained, confirmed the fact that the patients without preference to certain food, are in the habit of rational feeding, comparatively lower lipid indices in serum and the incidence of coronary symptomatics is the lowest in the same group. The scheme according to which the observation was carried out is proposed as a model of epidemiological investigations.