If you have been training consistently, eating reasonably well, sleeping enough, and still feeling like you are dragging yourself through every ride — there is a chance the answer is not in your training plan. It might be in your blood.
Iron deficiency is one of the most common and most underdiagnosed problems in endurance sport. I have spoken to multiple sports doctors and nutritionists on this podcast who all say the same thing: it is the first thing they test for when a cyclist comes in complaining of persistent fatigue and declining numbers.
Here is why cyclists are especially vulnerable. Every time you pedal, the repetitive pressure through your feet causes a small amount of red blood cell destruction — a process called foot-strike haemolysis. You lose iron through sweat on long rides. Hard training creates inflammation that temporarily blocks iron absorption in the gut. And a lot of cyclists — especially those chasing race weight — cut back on red meat, which is the most bioavailable source of dietary iron.
The problem is compounded by how iron deficiency gets diagnosed. Your GP will run a ferritin test and if it comes back above 15 or 20 ng/mL, they will tell you it is normal. And by clinical standards, they are right. But sports medicine research paints a very different picture. Multiple studies have shown that endurance athletes start experiencing performance impairment when ferritin drops below 50, and many sports practitioners now target 80 to 100 ng/mL for optimal performance.
The symptoms are almost identical to overtraining: constant tiredness, heavy legs, inability to hit targets, poor recovery between sessions, and a general feeling that your body just will not respond to training. I have seen riders completely restructure their training — dropping volume, adding rest weeks, taking time off — when the actual fix was an iron panel and a targeted supplementation protocol.
But do not just go and buy iron tablets off the shelf. Too much iron is dangerous. Get a proper blood panel done: ferritin, serum iron, transferrin saturation, and total iron-binding capacity. Find a doctor who understands athletic reference ranges, not just clinical ones. And if you do need supplementation, work with a professional to get the dosage and timing right.
This is fixable. But you have to test for it first.
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