I happened upon someone yesterday who tried to explain footstrike hemolysis and why distance runners are more prone to iron deficiency than seditary people. So I read this in Pete Pfitzinger's lab report:
#2: Many endurance athletes have low iron intakes. Low iron intake is a problem for vegetarians, and for those runners who eat red meat less than once per week. The typical high carbohydrate, low fat, low cholesterol runner's diet often includes little or no red meat. Red meat contains heme iron, which is more easily absorbed than plant sources of iron.
#3: Foot strike hemolysis is the breakdown of red blood cells when the foot hits the ground. While foot strike hemolysis is not a big problem for most runners, if you are larger than average or run high mileage on asphalt, it could be a factor for you.
I am larger than average, and I run exclusively on pavement/asphalt and I gave up meat about a year ago. I saw Food Inc. last fall and it was the final straw in terms of eating animal protein. After I stopped eating meat at least twice a week, over time (a few months) I started getting really fatigued. I could run, but I was always tired after, and I was sleeping like a rock 8-9 hours every night--still fatigued during the day. I could not pull myself together. Before Boston as I was at the peak of my marathon training and starting the taper, I force-fed myself a red meat on the supposition it was Ferritin iron deficiency. In addition, I started my B complex vitamins again--and in this article learned that Niacin and B12 deficiencies over time lead to iron deficiencies. So my hypothosis regading B complex and iron deficiency was, I think correct. I resent eating meat anymore. It was hard in those months to figure out what else besides huge quantities of beans and nuts (and shakes) could replace the amount of protein I felt I needed. But I do know that I was very tired. Since going back to eating some red meat each week since about the middle of April--I've gained a few pounds, but I feel much stronger. I'm sure going from 50+ mile weeks down to 30 miles for a few weeks helps too. |