Well-known research tracking 66,940 women enrolled in the Nurses' Health Study found a 40 percent decrease in the incidence of ovarian cancer in women with the highest dietary kaempferol intake as compared to women with the lowest intake. Along with broccoli, kale is one of the best sources of kaempferol—which has been associated with a reduced risk of heart disease. Kaemperfol is also found in tea as well as in Brussels sprouts and other greens.
Spinach is extremely high in iron, which protects the immune system and helps the body produce energy. It's especially important for menstruating and pregnant women, who require higher levels of this nutrient. However, iron deficiency is one of the most common nutrient deficiencies for all women. Iron deficiency causes anemia and low energy due to decreased oxygen being delivered to the cells. You can find iron in most leafy greens; other good sources include chard, mustard greens, and romaine lettuce.
Dark leafy greens like Swiss chard, spinach, kelp, and turnip greens are also excellent sources of magnesium, which plays a significant role in many key biological processes. This miracle mineral has been credited with a slew of health benefits, including lowering blood pressure, strengthening the immune system, strengthening bones, aiding in sleep, relaxing muscles, and relieving stress and anxiety.
Magnesium has been shown to reduce the severity and recurrence of migraine headaches. And a study of 60 women with urinary urge incontinence found that magnesium supplementation improved the symptoms of overactive bladder in nearly half of participants. Magnesium also aids in calcium absorption, playing a significant role in preventing osteoporosis; several studies on humans have shown that magnesium helps maintain bone mineral density.
Depression has been linked to low levels of calcium and magnesium, so it shouldn't come as a surprise that a study comparing the bone mass of depressed premenopausal women to their nondepressed peers found that the depressed women had reduced bone mass and the most thinning in their hip bones, putting them at higher risk of fractures.
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