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Nutrition et vieillissement

Bone Density With Age

Age-related decline in bone strength and structure, preventable through nutrition and exercise.

Definition

The progressive decline in mineral content and structural integrity of bones occurring with age, particularly accelerated in postmenopausal women. Optimal nutrition and exercise can slow bone loss and reduce fracture risk.

How it works

Bone density peaks in early adulthood and gradually declines with age, with significant acceleration after menopause due to estrogen loss. This decline increases osteoporosis and fracture risk, particularly affecting the hip, spine, and wrist. Calcium and vitamin D are fundamental for bone mineralization, while magnesium, phosphorus, and vitamin K play supporting roles in bone matrix formation. Protein provides the structural framework for bone, and inadequate intake accelerates mineral loss. Weight-bearing and resistance exercises stimulate bone-forming cells and are essential complements to nutrition. Regular monitoring of bone density helps identify high-risk individuals who may benefit from targeted interventions.

Role

Maintains skeletal strength, mineral density, and fracture resistance throughout aging.

Examples

  • Calcium
  • Vitamin D3
  • Vitamin K2
  • Magnesium
  • Phosphorus
  • Protein

Recommendations

Ensure 1000-1200 mg daily calcium intake from dairy, leafy greens, fortified plant milks, and supplements if needed. Maintain vitamin D levels at 30-50 ng/mL through sun exposure, fatty fish, and supplementation (800-2000 IU daily). Include weight-bearing exercise 30 minutes most days and resistance training twice weekly.

Key takeaway

Adequate calcium, vitamin D, and weight-bearing exercise are critical for maintaining bone density and preventing fractures in aging.

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