Introduction: obesity is a chronic disease of epidemic characteristics determined among other variables by the interaction of genetic and environmental factors. In patients with obesity an atherogenic phenotype is present. Bariatric surgery (BS) is an effective therapeutic alternative for the reduction of cardiovascular risk while improving the lipid profile. Objectives: to compare the differences in the lipid profile before and after submitting patients to two different bariatric surgery techniques with follow-up to the year of the intervention. Materials and methods: in the present study were included all patients undergoing BS in 2015 (n=138) at the Hospital Italiano de Buenos Aires. Results: the reduction of total cholesterol, triglycerides and LDL levels as well as the increase in HDL one year after the intervention were statistically significant and no differences were found when comparing the deltas of each variable of the lipid profile between two different surgical techniques. Conclusions: BS can be an effective treatment in obese patients with dyslipidemia who do not respond to pharmacological therapy given that significant changes are observed in the lipid profile.