Calcium intake and bone health throughout life

Area of Science:

• Nutritional Science
• Bone Biology
• Human Physiology

Background:

• Calcium requirements fluctuate based on life stage, physiological demands like pregnancy and lactation, and factors affecting absorption and excretion.
• Current recommended calcium intakes are lower than those of contemporary hunter-gatherers and primates, suggesting a re-evaluation may be needed.
• Bone health is complex, influenced by numerous factors beyond calcium intake, including hormonal status and lifestyle.

Purpose of the Study:

• To analyze the variability of calcium requirements across different physiological states.
• To compare recommended calcium intakes with those of ancestral populations and primates.
• To emphasize that calcium intake alone is insufficient for optimal bone health.

Main Methods:

• Comparative analysis of calcium requirements across life stages.
• Review of existing literature on calcium absorption and excretion factors.
• Examination of bone health determinants beyond calcium.

Main Results:

• Calcium needs vary significantly with growth, pregnancy, lactation, and hormonal status.
• Current recommendations are below ancestral and primate intake levels, adjusted for body size.
• Calcium provides limited protection against immobilization- or estrogen-withdrawal-induced bone loss.

Conclusions:

• Ensuring adequate calcium intake is a fundamental strategy for bone health.
• Optimal bone health is multifactorial and cannot be solely achieved by meeting calcium requirements.
• Calcium intake should be considered alongside other critical factors for bone growth and maintenance.