Footstrike anemia refers to red blood cell (RBC) destruction caused by the repetitive impact of running [1]. With each stride, the force of the foot hitting the ground can rupture red blood cells in tiny vessels in the feet. Since red blood cells contain hemoglobin, the protein that binds iron and transports oxygen, this damage can decrease iron levels and reduce the blood’s ability to supply oxygen to the body [1]. Consequently, athletes may experience fatigue, impaired recovery, and unexplained declines in endurance. Long-distance runners and high-mileage athletes are especially at risk, making awareness and prevention essential for maintaining performance.

 

Symptoms of Footstrike Anemia [2] 

• Shortness of breath
• Fatigue
• Reduced endurance capacity
• Feeling dizzy or lightheaded
• Cold extremities

 

Managing Footstrike Anemia with Nutrition

 

Although footstrike anemia can develop in athletes with otherwise balanced diets, consuming adequate amounts of iron-rich foods is critical to support and replenish iron stores. 

 

Heme-iron examples: Red meat (beef, lamb, bison) Poultry (chicken, turkey) Fish (salmon, tuna, sardines)

Non-Heme Iron Examples:  Leafy greens (spinach, kale) Beans and legumes Tofu, tempeh Fortified cereals*

*Note: Many gluten free grains and products are not fortified with iron.  Athletes with celiac disease or those following a gluten free diet should seek alternative iron sources.

 

Heme vs. Non-Heme Iron The type and source of dietary iron can significantly impact how well the body absorbs and utilizes this essential mineral:   Heme iron, found in animal proteins like red meat, poultry, and fish, is the most bioavailable, meaning your body can absorb and use it more easily.  Non-heme iron, found in plant-based foods like spinach, lentils, and beans, has lower bioavailability because certain compounds in plants can inhibit absorption.

 

While animal proteins offer the most bioavailable form of iron, plant-based athletes can still optimize iron absorption through strategic food pairings. Consuming non-heme iron alongside vitamin C is one way to enhance its uptake. For example, pairing spinach with a tomato-based sauce over chickpea pasta; preparing chili with a mix of beans, chickpeas, and tomatoes; or adding bell peppers to lentil dishes can improve iron absorption. Conversely, polyphenols and tannins in coffee and tea can inhibit iron absorption [1]; therefore, athletes should minimize or avoid consuming these beverages around meal times, especially when eating other iron-rich foods. Calcium from dairy products or supplements may also interfere if taken at the same time.

 

A registered dietitian can help address footstrike anemia with targeted nutrition and supplement guidance. 

 

Key Points

• Footstrike anemia is a condition where red blood cells break down due to repeated impact, particularly in the feet.
• Endurance runners are especially susceptible because of the high-volume, repetitive stress placed on their bodies.
• Ensuring adequate iron intake is crucial to offset red blood cell loss and support endurance and overall health.
• Heme iron sources (e.g., red meat, poultry, fish) are the most readily absorbed by the body.
• Non-heme iron sources (e.g., beans, spinach, fortified cereals) are better absorbed when paired with foods high in vitamin C.
• A registered dietitian can help athletes tailor their nutrition to prevent iron deficiency and optimize performance.

 

References

 

1. Damian MT, Vulturar R, Login CC, Damian L, Chis A, Bojan A. Anemia in Sports: A Narrative Review. Life. 2021;11(9):987. doi:https://doi.org/10.3390/life11090987 
2. Mayo Clinic. Anemia – Symptoms and Causes. Mayo Clinic. Published May 11, 2023. Accessed July 1, 2025. https://www.mayoclinic.org/diseases-conditions/anemia/symptoms-causes/syc-20351360