Subjects will admit the night before and get their first dose of NAC/ losartan/ placebo with dinner. Subjects will be fasted after 10 pm. The next morning at 6 am blood samples will be taken and leg blood flow (LBF) will be measured. Subjects will receive their second dose of NAC/ losartan/ placebo. As from 6 am every hour blood will be drawn until 1 pm. At 8am, the second biopsy is taken and LFB and CEU will be measured. At 11am they get their third dose of NAC/ losartan/ placebo together with leucine (oral) and again a muscle biopsy is taken and LBF is measured. Leucine is anabolic to skeletal muscle of elderly and so the investigators will use it to stimulate muscle building.