1. A food composition including! a) a source of protein,! b) a source of fat,! c) a source of carbohydrates, and! d) punicalagins. ! 2. The food composition according to claim 1, where the amount of punicalagins in the composition is from about 0.004 to about 0.20 mg / g of the composition. ! 3. The food composition according to claim 1, further comprising punic acid. ! 4. The food composition according to claim 3, where the amount of punic acid in the composition is from about 0.01 to about 40 mg / g of the composition. ! 5. The food composition according to claim 1, further comprising an extract of pomegranate leaves. ! 6. The food composition of claim 5, wherein the amount of pomegranate leaf extract in the composition is from about 4 mg / g to about 60 mg / g of the composition. ! 7. The food composition according to claim 1, further comprising punic acid and pomegranate leaf extract. ! 8. The food composition according to claim 1, where the food composition is a composition for infants. ! 9. A method of strengthening the immune system of a child, including the introduction of punicalagins to a child. ! 10. The method according to claim 9, where improving the functions of the immune system includes increasing resistance to infection. ! 11. The method according to claim 9, where the amount of punicalagins administered to the child is from about 1 mg to about 100 mg per day. ! 12. The method according to claim 9, where the method further includes the introduction of a child of punic acid. ! 13. The method according to item 12, where the amount of punic acid administered to the child is from about 50 mg to about 5 g per day. ! 14. The method according to claim 9, where the method further comprises administering to the child a pomegranate leaf extract. ! 15. The method according to 14, where the amount of pomegranate leaf extract administered to the child is1. Пищевая композиция, включающая ! a) источник белка, !b) источник жира, ! c) источник углеводов, и ! d) п