Imagine you are a thirtysomething woman, with a family, a career and a busy lifestyle. Despite your best efforts to eat well and be active, you constantly feel run down. At your annual physical, your doctor mentions that your iron is low, a condition not uncommon for a woman your age, so you pop some iron pills and pledge to make roast beef for dinner this Sunday. You suffer from migraine headaches from time to time, and you’ve had a long-standing battle with bloating and constipation, but you tell yourself that stress, hormones and eating on the run are probably the culprits.