The aim of this randomized study is to compare the occurrence of lipoatrophy in HIV-1 infected, naive patients receiving either a nucleoside reverse transcriptase inhibitor (NRTI)-sparing antiretroviral therapy with non-nucleoside reverse transcriptase inhibitor (NNRTI) and boosted protease inhibitor (PI), or a standard antiretroviral therapy with 2 NRTI plus either PI or NNRTI. Lipoatrophy is evaluated by measurement of fat volume by computed tomography (CT)-scan and DEXA (Dual Energy X-ray Absorptiometry).