Is an iron deficiency linked to seasonal affective disorder?

Could well be but...: When it comes to iron deficiency, the only questions are, "How will I replace my iron as rapidly and effectively as I can?" and "Why am I iron deficient? Is it my monthly bleeding, my diet -- perhaps ill-considered involvement with vegetarianism --, or do I have cancer or some other serious illness?" These questions must be answered to your satisfaction. If Rx helps your SAD, so much the better.