Young and middle-aged patients with coronary heart disease manifested an increase in the activity of kallikrein and BAEE-esterase together with a reduction in the levels of prekallikrein and alpha 2-macroglobulin. The maximal shifts were seen in young patients and in patients who sustained myocardial infarction less than a year before examination. High kallikrein level was associated with hypertriglyceridemia and disordered fibrinolytic activity. Dietetics promoted the normalization of the disordered parameters, particularly in patients whose diet included soybean.