A Brazilian study conducted in 2006 found that combining energy drinks and alcohol "appears to show us that the use of energy drinks might predispose people to abuse alcohol when its depressant effects — or at least the perception of such effects — are masked by them." Professor Roseli Boergnen de Lacerda, who conducted the study, also warned of another possible effect: "a higher risk of car accidents because they who drank energy drinks with alcohol felt less intoxicated than they were."