Iron deficiency is one of the most common nutritional deficiencies worldwide. Despite advances in diet awareness and supplementation, it remains a significant public health concern across both developing and industrialised nations.
Iron is an essential mineral required for oxygen transport, cellular energy production, and cognitive function. When iron levels become insufficient, the body’s ability to produce healthy red blood cells is compromised, which can ultimately lead to iron deficiency anaemia.
How common is iron deficiency?
According to estimates from the World Health Organization, iron deficiency is the leading cause of anaemia globally and affects a substantial proportion of the population, particularly:
- Women of reproductive age
- Pregnant women
- Infants and young children
- Adolescents
- Individuals with restricted diets
- Endurance athletes
- Those with gastrointestinal conditions affecting absorption
In women of childbearing age, monthly blood loss significantly increases iron requirements. During pregnancy, iron demand rises further to support expanding blood volume and fetal development. Even in otherwise healthy adults, marginal iron intake over time can gradually deplete iron stores.
Iron plays several critical roles in the body:
- Formation of haemoglobin, the protein in red blood cells that carries oxygen
- Production of myoglobin, which supplies oxygen to muscles
- Support of mitochondrial energy production
- Contribution to cognitive development and neurological function
- Support of immune system activity
When iron availability declines, oxygen delivery to tissues becomes less efficient. Because every organ depends on oxygen to function optimally, deficiency can affect multiple systems.
Common symptoms of iron deficiency
Iron deficiency often develops gradually. Early symptoms may be subtle and easily overlooked.
Persistent fatigue
The most common symptom is ongoing tiredness or low energy. Reduced haemoglobin limits oxygen delivery to tissues, impairing energy production.
Shortness of breath
Even mild exertion may feel more demanding due to reduced oxygen transport.
Pale skin
Lower red blood cell levels can result in paler skin tone or pale inner eyelids.
Dizziness or headaches
Reduced oxygen supply to the brain may contribute to light-headedness or frequent headaches.
Brittle nails or hair thinning
Iron plays a role in cell growth and repair, including tissues such as hair and nails.
Cold sensitivity
Individuals with iron deficiency may feel unusually cold due to impaired oxygen delivery and circulation.
Reduced cognitive focus
Iron supports neurotransmitter function and oxygen supply to the brain. Deficiency can affect concentration, memory, and mental clarity.
In more advanced cases, iron deficiency can progress to iron deficiency anaemia, where haemoglobin levels fall below normal ranges.
Causes of iron deficiency
Iron deficiency can arise from several factors:
- Inadequate dietary intake
- Increased physiological demand (e.g., pregnancy, growth spurts)
- Blood loss (menstrual, gastrointestinal, or injury-related)
- Reduced absorption due to digestive disorders
- Diets low in bioavailable iron
There are two forms of dietary iron: haem iron (from animal sources), which is more readily absorbed, and non-haem iron (from plant sources), which is less efficiently absorbed and influenced by other dietary factors.
The importance of bioavailability
Iron absorption occurs primarily in the small intestine and can be influenced by the form in which it is consumed. Factors such as digestive health, the presence of inhibitors (like phytates), and nutrient interactions can affect uptake.
Vitamin C, for example, enhances the absorption of non-haem iron by converting it into a more bioavailable form. Delivery systems that optimise absorption may support more efficient replenishment of iron stores.
Early identification and management
Because symptoms often develop gradually, iron deficiency may go unrecognised for extended periods. Blood testing—measuring haemoglobin and ferritin levels—is the most reliable way to assess iron status.
Early identification allows for dietary adjustments and appropriate supplementation before more severe anaemia develops.
Supporting iron balance
Maintaining adequate iron levels is essential for sustained energy, cognitive performance, immune function, and overall vitality. Awareness of risk factors, early symptoms, and the importance of absorption helps support long-term nutritional resilience.
Iron deficiency is common, but it is also manageable with informed nutritional strategies and appropriate monitoring.
Liquidwell Visco Forte nutritional science team, Jan 26.
.jpg)
.jpg)
.jpg)
