1. A method for preserving lean body mass during weight loss in an animal comprising administering to the animal a therapeutically effective amount OEA.2. The method of claim 1, wherein OEA is administered in an amount from about 0.01 to 1000 mg / kg / sutki.3. The method according to claim 1, wherein OEA administered to the animal on a regular osnove.4. The method of claim 1, wherein OEA is administered in an amount from about 1 to 4000 mg.5. The method of claim 1, wherein OEA is administered as a dietary supplement or food kompozitsii.6. A method according to claim 5, wherein the composition is a food composition and OEA is from about 0.001 to 10% of the food kompozitsii.7. A method according to claim 5, wherein the composition or dietary supplement further comprises one or more probiotics inactivated probiotics inactivated probiotic components that have beneficial effects for health, such similar or same as that of probiotics and one or more prebiotikov.8. The method of claim 1, wherein the animal is a human or a domestic zhivotnym.9. The method of claim 8, wherein the pet is sobakoy.10. The method of claim 8, wherein the pet is koshkoy.11. The method of claim 1, wherein the animal is overweight animals suffering or ozhireniem.12. A composition comprising OEA a therapeutically effective amount to preserve lean body mass during pohudeniya.13. The composition of claim 12 comprising OEA in an amount sufficient for application of OEA animal in an amount from about 0.01 to 1000 mg / kg / sutki.14. Pharmaceutical or nutraceutical composition comprising OEA and one or more pharmaceutically acceptable carriers or nutraceutical, razbav1. Способ сохранения безжировой массы тела в процессе похудения у животного, предусматривающий введение животному терапевтически эффективного количества ОЭА.2. Способ по п.1, в котором ОЭА вводят в количестве примерно от 0,01 до 1000 мг/кг/сутки.3. Способ по п.1, в котором ОЭА вводят животному на регулярной основе.4. Способ по п.1, в котором
