This study analyses the nutritional value of diets consumed by boys with two different food patterns, expressed as a different frequency of consuming pork and poultry or snacks, sweets and sweet drinks. Two hundred and fifty-three boys aged 15-18 years from secondary schools of various types situated in the Suwałki region and in the city of Olsztyn were included in the study. The factor analysis was applied to data on the frequency of consuming 21 products, which resulted in identifying 8 food patterns typical of young people. Two selected food patterns were further analysed: pork plus poultry (pattern III) and snacks, sweets and sweet drinks (pattern IV). When the frequency of consuming pork and poultry was low, the boys’ diet had a high nutritional value, but at the same time, cholesterol, protein and fat contents were too high. The results indicate that a low frequency of pork and poultry consumption resulted in a more varied diet, containing products of both plant and animal origin. An increase in the frequency of snacks, sweets and sweet drinks consumption resulted in higher amounts of consumed vitamins and minerals; however, it also resulted in consuming excessive amounts of protein, fat and energy.