<qa>  How many healthy subjects were recruited?104 healthy subjects 56 males and 54 females were recruited using oral advertisements among the students of 18-19 years-old belonging to the Istituto Agrario and the Istituto alberghiero Raineri-Marcora of Piacenza. The subjects were asked to complete a questionnaire on alcohol consumption and another one related to nutritional knowledge. Then anthropometric data were measured: height, weight, waist and hips circumferences, waist-hips ratio and skinfolds were evaluated for each subject and body fat mass was calculated. 