Feeling more tired than usual? Not running up to your potential? More frequent agging aches and pains from running?
Check out this article by Jason Brumitt in the National Strength and Conditioning Association Training Journal titled Iron Deficiency in the Endurance Athlete: Tips for Prevention and Recognition.
The list of food sources for iron includes:
Dark Green Leafy Vegetables
Fortified Breakfast Cereals
Legumes Dried Beans
If you think you may be iron deficient, go to a doctor for blood work and evaluation.