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๐Ÿฅ—Intro to Nutrition Unit 10 Review

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10.5 Nutrition and Bone Health

๐Ÿฅ—Intro to Nutrition
Unit 10 Review

10.5 Nutrition and Bone Health

Written by the Fiveable Content Team โ€ข Last updated September 2025
Written by the Fiveable Content Team โ€ข Last updated September 2025
๐Ÿฅ—Intro to Nutrition
Unit & Topic Study Guides

Calcium and vitamin D work together to build and maintain strong bones. Calcium forms the structure, while vitamin D helps your body absorb and use it effectively. Getting enough of both is crucial for bone health throughout life.

Exercise and diet play key roles in keeping bones healthy. Weight-bearing activities stimulate bone growth, while a balanced diet with adequate protein, vitamins, and minerals supports bone strength. Avoiding excess caffeine and sodium helps maintain bone density.

Calcium and Vitamin D for Bone Health

Calcium and vitamin D for bones

  • Calcium forms primary mineral component of bones and teeth providing essential strength and structure
  • Calcium actively participates in continuous bone remodeling process maintaining skeletal integrity
  • Vitamin D enhances calcium absorption in intestines promoting efficient utilization
  • Vitamin D facilitates calcium reabsorption in kidneys reducing losses
  • Vitamin D aids incorporation of calcium into bone tissue supporting mineralization
  • Synergistic relationship between calcium and vitamin D optimizes bone mineral density

Sources and absorption of calcium

  • Dairy products supply readily available calcium (milk, yogurt, cheese)
  • Leafy greens offer non-dairy calcium source (kale, collard greens, spinach)
  • Fortified foods provide additional calcium options (orange juice, plant-based milks)
  • Canned fish with edible bones offer calcium-rich alternative (sardines, salmon)
  • Vitamin D status significantly impacts calcium absorption efficiency
  • Age-related decline in calcium absorption occurs as people get older
  • Phytates and oxalates in plant foods can inhibit calcium absorption
  • High sodium intake increases urinary calcium excretion affecting overall balance
  • Protein intake influences calcium metabolism and skeletal health

Exercise and Dietary Factors Affecting Bone Health

Weight-bearing exercise for bones

  • Stimulates osteoblast activity promoting new bone formation
  • Increases bone mineral density improving overall bone strength
  • Enhances bone structure and architecture reducing fracture risk
  • Improves balance and coordination decreasing likelihood of falls
  • Walking and jogging provide accessible weight-bearing exercise options
  • Dancing combines weight-bearing with balance and coordination training
  • Resistance training using weights or bodyweight builds bone and muscle strength

Dietary impacts on bone density

  • Moderate protein intake supports bone health providing building blocks for bone matrix
  • Excessive protein may increase calcium excretion through urine
  • Adequate protein essential for maintaining bone structure and strength
  • High caffeine intake slightly decreases calcium absorption affecting bone density
  • Moderate caffeine consumption has minimal impact on overall bone health
  • Vitamin K supports bone mineralization activating osteocalcin protein
  • Magnesium contributes to bone structure as cofactor for bone-forming enzymes
  • Phosphorus serves as component of bone mineral hydroxyapatite
  • Excessive sodium intake increases urinary calcium losses affecting bone density
  • High acid-producing diets may negatively impact bone health increasing mineral loss
  • Alkaline-forming foods (fruits, vegetables) support bone health by buffering acid load