Under the aspect of the special function and importance of amino acids a modified procedure of infusion therapy via peripheral veins has been investigated. This regimen is characterized by the combination of amino acids with carbohydrates to ensure the minimal obligatory amount of glucose on which some tissues are dependent. On the basis of these investigations the concept of Blackburn et al. is discussed in detail where the main aspect concerns the question of endogenous energy supply by beta-oxidation of fatty acids. It is shown on the basis of gaz exchange measurements that under the treatment with the carbohydrate-containing solution the mobilization of NEFA non esterified fatty acids is not suppressed.