If you’re looking to improve your 5K time, you may want to up your iron intake. Recent research from the University of Melbourne, published in the Journal of Nutrition, reviewed 22 studies and found that women in their childbearing years who took iron could exercise at a lower heart rate but at a higher efficiency (in other words, work out harder with less fatigue). Plus, the study confirms that iron deficiency—a common condition for women during reproductive years—hinders exercise performance.
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