A bacterial composition which comprises from 10 4 to 10 12 cfu/g of Pediococcus pentosaceus viable cells which have the ability to induce the production of interleukin-10, wherein the production of interleukin-10 by THP-1 macrophages in the presence of Pediococcus pentosaceus cells as expressed as normalized increase is higher than the production of interleukin-10 by the negative control, which are THP-1 macrophages in the absence of Pediococcus pentosaceus cells, when the normalized increase is determined by the following steps: (a) differentiating THP-1 monocytes into macrophages by growing the THP-1 monocyte cell line obtained from the cell collection of the Public Health England, catalogue number 88081201, in Roswell Park Memorial Institute (RPMI) 1640 medium with 10 % Fetal Bovine Serum, and with phorbol 12-myristate 13-acetate to a final concentration of 0.16 μM; (b) growing the THP-1 macrophages in RPMI 1640 medium with 10 % FBS in 24-wells ELISA plates to a final concentration of 10 6 macrophages/well; (c) incubating for 2.5 hours the THP-1 macrophages with lipopolysaccharide at a final concentration of 10 ng/ml, and washing the THP-1 macrophages with Dulbecco's Phosphate Buffered Saline medium (D-PBS); (d) getting a culture of Pediococcus pentosaceus cells ready by having grown it overnight in Man, Rogosa and Sharpe medium at 37 °C in a 5 % CO 2 atmosphere; (e) adding to each ELISA-well 500 μl of RPMI 1640 medium with 10 % FBS and an appropriate amount of a dilution of Pediococcus pentosaceus cells to obtain a final ratio of 25:1, i.e. 2.5 x 10 7 cfu of Pediococcus pentosaceus cells: 10 6 THP-1 macrophages; (f) incubating the THP-1 macrophages with the Pediococcus pentosaceus cells for 2.5 hours at 37 °C or without the Pediococcus pentosaceus cells in the same conditions as negative control; (g) washing the THP-1 macrophages with D-PBS medium to remove the Pediococcus pentosaceus cells, subsequently adding to the THP-1 macrophages RPMI 1640 medium with 10 % FBS supplemented with 50 μg/ml gentamicin, 10 μg/ml ampicillin and 12 μg/ml chloramphenicol, incubating at 37 °C at 5-7 % CO 2, and taking aliquots at 5 and 24 hours; (h) centrifuging the aliquots and assaying the supernatants for interleukin-10 quantification by flow cytometry; and (i) calculating the normalized increase of interleukin-10 concentration, with the formula (IL10 24h - IL10 5h) / IL10 5h; wherein IL10 5h and IL10 24h is the concentration of interleukin-10 in pg/ml at 5 and 24 hours, respectively. (a) differentiating THP-1 monocytes into macrophages by growing the THP-1 monocyte cell line obtained from the cell collection of the Public Health England, catalogue number 88081201, in Roswell Park Memorial Institute (RPMI) 1640 medium with 10 % Fetal Bovine Serum, and with phorbol 12-myristate 13-acetate to a final concentration of 0.16 μM; (b) growing the THP-1 macrophages in RPMI 1640 medium with 10 % FBS in 24-wells ELISA plates to a final concentration of 10 6 macrophages/well; (c) incubating for 2.5 hours the THP-1 macrophages with lipopolysaccharide at a final concentration of 10 ng/ml, and washing the THP-1 macrophages with Dulbecco's Phosphate Buffered Saline medium (D-PBS); (d) getting a culture of Pediococcus pentosaceus cells ready by having grown it overnight in Man, Rogosa and Sharpe medium at 37 °C in a 5 % CO 2 atmosphere; (e) adding to each ELISA-well 500 μl of RPMI 1640 medium with 10 % FBS and an appropriate amount of a dilution of Pediococcus pentosaceus cells to obtain a final ratio of 25:1, i.e. 2.5 x 10 7 cfu of Pediococcus pentosaceus cells: 10 6 THP-1 macrophages; (f) incubating the THP-1 macrophages with the Pediococcus pentosaceus cells for 2.5 hours at 37 °C or without the Pediococcus pentosaceus cells in the same conditions as negative control; (g) washing the THP-1 macrophages with D-PBS medium to remove the Pediococcus pentosaceus cells, subsequently adding to the THP-1 macrophages RPMI 1640 medium with 10 % FBS supplemented with 50 μg/ml gentamicin, 10 μg/ml ampicillin and 12 μg/ml chloramphenicol, incubating at 37 °C at 5-7 % CO 2, and taking aliquots at 5 and 24 hours; (h) centrifuging the aliquots and assaying the supernatants for interleukin-10 quantification by flow cytometry; and (i) calculating the normalized increase of interleukin-10 concentration, with the formula (IL10 24h - IL10 5h) / IL10 5h; wherein IL10 5h and IL10 24h is the concentration of interleukin-10 in pg/ml at 5 and 24 hours, respectively.