Reduction of Sweetened Beverages and Intrahepatic Fat

The study will enroll 68 overweight male and female subjects with a high (\> 2 3dl-can soda/day) consumption of sweetened beverage per day. After a run-in period of 4 weeks, subjects will be randomized to either a 12-week intervention arm in which sweetened beverages will be replaced by artificially sweetened, calorie-free beverages, or to a control arm. The following measurements will be performed at the end of the run-in period and at the end of the intervention period * intrahepatic fat concentration * visceral fat volume * changes in day-long metabolic profile from baseline(plasma glucose, insulin, and triglyceride concentrations) * changes in food intake and daily energy, carbohydrate and sugars intake from baseline