To evaluate the effects of synbiotic supplementation on insulin resistance, and lipid profile in subjects with metabolic syndrome, in a randomized, double-blind, placebo-controlled pilot study, 38 subjects with metabolic syndrome will be supplemented with either synbiotic or placebo capsules twice/day for 28 weeks. Both the synbiotic (G1) and the placebo (G2) groups will be advised to follow an energy balanced diet and physical activity recommendations. Parameters related to metabolic syndrome and insulin resistance will be measured every 7 weeks during the study course.