Study participants responding to the inclusion criteria of this trial will be chosen both in the hospital setting and in the general practitioners' clinics. At the enrollement, anthropometric and biochemical variables will be measured, as well as bioimpedenziometric and calorimetric parameters; participants will also undergo Fibroscan-CAP to measure the outcome and will be asked about their medical history and life-style. Subjects will be randomized to the different arms of the trial and be followed-up at the end of the sixth and the twelfth week of enrollement.