The following food products of barley were analyzed: three types of instant barley flakes, four types of pearl barley groats, and two types of pearl barley grits. Porridge oat and corn flakes were used as a comparison material. The following parameters were measured: content of water, raw ash, protein, fat, and fibre’s fractional composition. The analysis was performed using three methods: detergent method (NDF, ADF, CEL, HCEL, ADL), Weende’s method, and enzymatic method (TDF, IDF, SDF). The products analysed were characterized by the moderate protein content (8.76 12%), high dietary fibre content (12.53–16.57%), and very low water solubility index (4.34–5.83%). These types of cereal products meet the criteria of the most recent nutritional recommendations and should be qualified for the basis of the Harvard food pyramid.