Prof. Milan Holecek, M.D., Ph.D., D.Sc., has adequate knowledge of biochemistry, physiology, pathophysiology, and medicine to write the proposed book. For more than 40 years, Prof. Holecek has been interested in amino acid metabolism in various physiological and pathological conditions and their use in nutritional therapy. He has published over a hundred scientific articles on amino acids, mainly as the first or corresponding author. The main outputs of his scientific work include articles focused on the physiological and clinical importance of branched-chain amino acids, glutamine, histidine, serine, and aspartate and amino acid metabolism in sepsis, liver injury, and diabetes. The ability of Prof. Holecek to write a book has been proven by several comprehensive review articles published in reputed journals, one monograph focused on branched-chain amino acid metabolism in muscle-wasting disorders, two textbooks on metabolism and nutrition, and one on amino acid metabolism (in the Czech language).