The Importance of Iron in the Human Body
Essential Functions of Iron
Iron (Fe) plays a crucial role in various molecular processes within the human body. Key functions include:
– The production of red blood cells
– The transport of oxygen and carbon dioxide
– The conversion of blood sugar into energy
– The synthesis of enzymes
– Supporting certain immune system functions
Prevalence of Iron Deficiency
Iron deficiency is recognized as the most widespread nutrient deficiency disorder globally, affecting approximately 2 billion individuals in both developing and developed nations. This condition often arises from undernutrition.
The demand for iron peaks during pregnancy and the first two years of life. According to the World Health Organization, over 750 million preschool children around the world are affected by anemia, a condition primarily caused by iron deficiency.
Symptoms and Consequences of Anemia
Symptoms of anemia may include:
– Persistent fatigue
– Dizziness
– Weakened immunity
– Irritability
– Pica (cravings for non-food items like clay or dirt)
– Poor oral intake
If left untreated, iron deficiency and anemia during early childhood can lead to significant cognitive and metabolic impairments.
Treatment Options for Iron Deficiency
Oral Iron Supplements
Oral iron supplements, particularly ferrous sulfate, have become a standard treatment for iron deficiency and anemia. However, a recent meta-analysis encompassing nearly 10,000 studies on the impact of iron supplements in children aged 4 months to 2 years revealed mixed outcomes.
Benefits and Concerns of Iron Supplementation
The analysis indicated several potential benefits of iron supplementation, including:
– Reduced risk of anemia and iron deficiency
– Increased hemoglobin levels, which are crucial for oxygen transport
– Elevated ferritin levels, essential for iron storage
Conversely, the studies also noted that children who consumed iron supplements daily for at least three months tended to be shorter and lighter compared to their peers who did not take supplements. Although not conclusively proven, there is a possibility that iron supplementation may hinder growth by causing vomiting and diminishing appetite. Additionally, these children experienced a higher frequency of fever.
While no specific adverse effects on cognitive and psychological development were identified, further investigation into this area is warranted.
Preventive Strategies for Iron Deficiency
Dietary Recommendations
The most effective way to prevent iron deficiency in children is through proper dietary practices. Children require approximately 7 to 11 mg of iron per day until early adolescence.
Although controversial, some healthcare professionals recommend that infants and children up to 5 years old limit cow or goat milk intake, opting instead for iron-enriched baby formulas and cereals.
For older children, beneficial food sources include:
– Beans
– Dark green leafy vegetables
– Egg yolks
– Red meat
– Chicken
– Fish
Parents should also avoid junk foods that lack nutritional value.
Enhancing Iron Absorption
Vitamin C is known to improve iron absorption. While orange juice is not advisable for infants under one year, other vitamin C-rich foods such as melons, strawberries, apricots, kiwis, broccoli, tomatoes, and potatoes can be included in their diet.
References
– “Micronutrient deficiencies.” World Health Organization. Available from: http://www.who.int/nutrition/topics/ida/en/. Last accessed: August 2013.
– “Role of iron in the human body.” Nelsons Natural World. Available from: http://www.nelsonsnaturalworld.com/en-us/uk/our-brands/spatone/iron-essentials/role-of-iron-in-the-body/. Last accessed: August 2013.
– Pasricha, S-R. et al. “Effect of daily iron supplementation on health in children aged 4—23 months: a systematic review and meta-analysis of randomised controlled trials.” The Lancet: Global Health 1(2):e77-e86. August 2013.
– “Iron deficiency in children: Prevention tips for parents.” Mayo Clinic. Available from: http://www.mayoclinic.com/health/iron-deficiency/MY01654. Last accessed: August 2013.