Hidden Hunger: The Iron Deficiency You Can't See
Being fit, maintaining a healthy weight, or completing a marathon does not always mean the body is nutritionally healthy. Many individuals experience "hidden hunger"- a condition where the body lacks essential vitamins and minerals despite consuming enough calories. Because there are often no obvious outward signs, these deficiencies may go unnoticed until they begin affecting health.
Iron deficiency is one of the most common forms of hidden hunger and can lead to fatigue, reduced exercise capacity, poor recovery, and anaemia.
Case Presentation
A 37-year-old woman, an active marathon runner with a normal body weight and a healthy lifestyle. Later, after 3 months of marathon running, she presented with progressive breathlessness on exertion, palpitations, severe weakness, and persistent fatigue for nearly two weeks.
Investigations revealed significantly low haemoglobin levels, while an iron profile confirmed severe iron deficiency anaemia. To identify the underlying cause, the medical team performed a comprehensive evaluation. Tests including stool occult blood, Coombs test, IgA anti-tTG, upper gastrointestinal endoscopy, and colonoscopy (Internal Haemorrhoids) were performed to rule out any blood loss
She received two units of packed red blood cell (PRBC) transfusion, intravenous iron therapy, and was discharged on oral iron and vitamin D supplementation with dietary counselling and follow-up.
Expert Insight
Long-distance endurance athletes are particularly vulnerable to iron depletion. Repeated intense exercise can lead to iron loss through heavy sweating, microscopic breakdown of red blood cells (foot-strike haemolysis), minor gastrointestinal blood loss, and increased iron requirements for recovery. Without timely replenishment, iron stores (Serum ferritin) gradually become exhausted, resulting in anaemia despite an otherwise healthy appearance.
Key Takeaway
Hidden hunger, a form of malnutrition, doesn't always show on the weighing scale. A person may appear healthy, maintain an ideal body weight, and remain physically active, yet still suffer from significant micronutrient deficiencies.
Persistent fatigue, reduced stamina, breathlessness, poor recovery after exercise, or unexplained weakness should never be ignored. While protein is essential for muscle recovery and endurance, micronutrients are equally important in supporting overall strength and performance.
Iron deficiency is one of the most common causes of anemia and often develops gradually. Symptoms may not appear immediately but can become noticeable after the body's iron stores are depleted, leading to fatigue, weakness, and reduced physical performance.
