As more is known about Vitamin C, the RDA will most likely change. Taking more than 500 mg of Vitamin C is pointless, as excess is excreted through the urine. At 40, a woman is more likely to be more aware of health and health problems. At this stage, a woman's body is in transition from the period of childbearing to the onset of menopause. Fertility drops sharply and hormone levels keep falling.
Women experience a decline in estrogen, increasing the risk of heart disease and osteoporosis.
Resting metabolic rates drop 4 to 5 percent each decade, so the body will require fewer calories to function. It's time to eat sensibly and continue a healthy exercise routine. This is an essential antioxidant that helps form red blood cells, muscle and other tissue. In larger quantities it may protect against cancer, heart disease and enhance immune function. While sufficient calcium can be had from diet alone, many women don't get the proper amount.