The aim of this study was to compare the nutritional value of natural Fabaceae seeds (pea, faba bean, yellow lupine) with that of dehulled and extruded seeds. In the first stage of the research, the thousand seeds weight (TSW) was evaluated, then the seeds were subjected to dehulling or extrusion. In the next step, the contents of basic nutrients, gross energy, selected macroelements (Ca, P, K and Na) and anti-nutritional substances (phytates, tannins, trypsin inhibitors and alcaloids) were analysed. It was shown that the highest TSW, hull and endosperm weight
characterised faba bean seeds. In all the species of Fabaceae seeds, after their dehulling an increase of total protein content and a reduction in crude fibre (P ≤ 0.01) were marked, as well as in  faba bean and lupine – an increase of crude ash content (P ≤ 0.05). The process of extrusion of the assessed seeds of Fabaceae had no effect on the amount of crude protein and crude fibre, and only caused a reduction of the level of dry matter and crude fat in the extrudate of faba bean (P ≤ 0.05). Both refining treatments significantly decreased the content of the analysed anti-nutritional substances (with the exception of phytates in peas and faba bean) in seeds. Dehulling of seeds was the more effective treatment in lowering the amount of phytates and tannins, while in the case of trypsin inhibitors and alkaloids, the process of extrusion was more effective.