Bioavailability of copper

Area of Science:

• Nutritional Science
• Human Physiology

Background:

• Dietary copper intake frequently falls short of recommended levels in both infants and adults.
• Despite low intake, copper status is generally adequate across most populations.
• Infants are a vulnerable group due to low copper content in milk.

Purpose of the Study:

• To evaluate copper requirements and status in different age groups.
• To assess factors influencing copper bioavailability from various milk sources.
• To identify specific populations at risk for copper deficiency.

Main Methods:

• Analysis of dietary intake data and copper status indicators.
• Comparative assessment of copper bioavailability from human milk, cow milk, and infant formula.
• Review of factors affecting copper absorption, including dietary components.

Main Results:

• Adequate copper status observed despite intakes below recommendations for most adults and infants.
• Premature infants identified as a high-risk group with elevated copper requirements.
• Copper bioavailability is significantly higher from human milk compared to cow milk and infant formula.
• Ascorbic acid, protein source, amino acids, and carbohydrates influence copper availability.
• Phytate, zinc, and iron show minimal impact on copper absorption at physiological intakes.

Conclusions:

• Current copper recommendations may be overestimated for the general population, excluding premature infants.
• Optimizing copper intake for infants requires consideration of milk source and bioavailability.
• Further research into factors affecting copper metabolism is warranted, particularly for high-risk groups.