1. The use of cysteine in the treatment and / or prevention of malnutrition and / or disorders associated with such malnutrition. 2. The use according to claim 1, wherein the cysteine is in the form of a cysteine precursor selected from the group consisting of cysteine bound in a protein, peptide hydrolyzate or peptide, for example gamma-glutamyl-cysteine, or another form of the peptide, for example gamma-glutamyl-cysteine ether, mixed disulfides, such as L-cysteine-glutathione disulfide, cysteine prodrugs, N-acetyl-cysteine (in free, amide or ether forms), S-allyl-cysteine, S-methyl-cysteine, S-ethyl-cysteine, S-propyl-cysteine, TKA (thiazolidine-carboxylic acid), OTC (L -2-oxothiazolidine-4-carboxylate), and 3-hydroxymethyl-mercapto-L-cysteine. 3. The use according to claim 2 in order to increase food intake and / or to reduce satiety and / or saturation. 4. The use according to claim 3 in order to increase food intake and / or to reduce satiety and / or satiety. 5. The use according to claim 3 in order to increase appetite. 6. The use according to claim 4 in order to increase appetite. 7. The use of claim 1, wherein the nutritional deficiency disorder is selected from the group consisting of anorexia, anorexia nervosa, cachexia, inflammatory diseases associated with reduced food intake, or combinations thereof. The use according to any one of the preceding paragraphs, where cysteine is intended for administration to an elderly person. 9. The use of claim 8 for the treatment and / or prevention of age-related reduction in food intake. 10. The use according to any one of paragraphs. 1-7 and 9, where cysteine is in the form of a nutritional composition. 11. The use of claim 8, wherein the cysteine is in the form of a nutritional composition. Application1. Применение цистеина в лечении и/или профилактике недостаточности питания и/или расстройств, связанных с такой недостаточностью.2. Применение по п.1, где цистеин находится в форме предшественника цистеина, выбранног
