Yogurt is a valuable health food for both infants and elderly persons. For children, it is a balanced source of protein, fats, carbohydrates, and minerals. For senior citizens, who frequently have more sensitive colons or who no longer produce much lactase, yogurt is also a valuable food. Elderly intestines showed declining levels of bifidus bacteria, which allow the growth of toxin-producing and, perhaps, cancer-causing bacteria. Yogurt may help prevent osteoporosis, reduce the risk of high blood pressure. Yogurt with active cultures helps the gut, may discourage vaginal infections, and may help one feel fuller.[38]