Calorie Restriction, Aging and LongevityFood or calorie restriction has been shown in many short lived animals and the rhesus monkey to prolong life span. Life long nutrition studies are not possible in humans because of their long survival. Studies over two to six years in healthy adult humans have, however, shown that a 20% reduction in food or calorie intake slows many indices of normal and disease related aging. Thus, it is widely believed that long term reduction in calorie or food