Dietary and prophylactic iron supplements : Helpful or harmful?

Area of Science:

• Physiology
• Immunology
• Nutritional Science

Background:

• Mild hypoferremia is a physiological defense mechanism.
• This defense withholds iron from pathogens and neoplastic cells.
• Iron overload can compromise this host defense system.

Purpose of the Study:

• To highlight the physiological role of hypoferremia.
• To identify factors that can thwart the body's iron-withholding defense.
• To question the conventional approach of correcting hypoferremia.

Main Methods:

• Literature review and synthesis of existing research on iron metabolism and host defense.
• Analysis of physiological responses to various insults.
• Evaluation of the impact of iron overload on immune function.

Main Results:

• Hypoferremia is an adaptive response to infections, cancer, and other insults.
• Practices such as excessive iron fortification, supplements, alcohol, and smoking can lead to iron overload.
• Elevated iron levels can be detrimental in conditions like chronic infection, neoplasia, cardiomyopathy, and arthritis.

Conclusions:

• Widespread hypoferremia is often a beneficial physiological response, not a pathological condition.
• Attempts to correct hypoferremia by increasing iron levels may be misguided and harmful.
• Preserving the body's natural iron-withholding capacity is crucial for host defense.