Calcium and peak bone mass

Area of Science:

• Bone metabolism and osteoporosis prevention
• Nutritional science
• Human physiology

Background:

• Adequate calcium intake during growth influences peak bone mass, potentially preventing osteoporosis later in life.
• Adolescence is a critical period for skeletal calcium retention, with potential requirements up to 1600 mg/day.
• Understanding calcium requirements and metabolism during peak bone mass acquisition is essential for early osteoporosis prevention.

Purpose of the Study:

• To assess calcium requirements in young individuals during growth.
• To evaluate the determinants of calcium metabolism during peak bone mass acquisition.
• To inform recommendations for optimal calcium intake to maximize peak bone mass.

Main Methods:

• Analysis of 487 calcium balance studies from published reports.
• Categorization of data by developmental phase and calcium intake.
• Evaluation of calcium intake, skeletal modeling/turnover, and urinary calcium excretion.

Main Results:

• Calcium intake and skeletal modeling/turnover are key determinants of calcium balance during growth.
• Infants and adolescents exhibit higher calcium absorption to meet increased requirements.
• Urinary calcium increases with age, peaking by puberty, with limited correlation to intake during rapid skeletal formation.

Conclusions:

• Current Recommended Dietary Allowances (RDAs) for calcium may be insufficient for children, adolescents, and young adults.
• Higher calcium intake is suggested to ensure sufficient skeletal retention for maximal peak bone mass.
• Peak bone mass is significantly influenced by nutrition, heredity, and endocrine factors, with most accumulation by late adolescence.