A total of 92 males aged 28 to 55 years were examined. These included 28 apparently healthy individuals, 45 subjects with preclinical coronary heart disease and 19 patients with Functional Class I-II coronary heart disease. A special questionnaire was used to examine the dietary patterns of the subjects with preclinical coronary heart disease, i.e. those having no typical clinical signs of the disease, but showing signs of myocardial infarction during the maximum exercise testing and minimal coronary arterial changes at selective coronary angiography. The subjects, unlike healthy individuals and CHD patients, were found to have 1 or 2 meals a day, frequently late at night, consume large amounts of sugar and other candies, fatty milk products, butter, eggs; small quantities of vegetables, fruits, and fish, often put additional amounts of salt to their diet. The subjects, as patients with severe CHD but unlike healthy individuals, were shown to have hypercholesterolemia and display high low density lipoprotein and apo-lipoprotein B levels; apo B/apo A being more than 1. The above dietary patterns of subjects with preclinical CHD represent one of the causes of abnormal changes in the blood lipid profile, which result in further CHD development.