Bones Are Living Tissue
Many people think of their bones as static structures, like the framework of a building. In reality, bone is living tissue that is constantly being broken down and rebuilt in a process called remodeling. Until about age 30, your body builds new bone faster than it breaks down old bone, increasing bone density. After 30, the balance gradually shifts, and after 50, bone loss accelerates, particularly in women following menopause.
This accelerated bone loss can lead to osteopenia (mild bone loss) and osteoporosis (significant bone loss with increased fracture risk). According to the National Osteoporosis Foundation, approximately 54 million Americans have low bone density, and one in two women and one in four men over 50 will break a bone due to osteoporosis.
At Zimmer Medical Group, we screen for bone loss and work with patients to build comprehensive bone health plans that go well beyond calcium supplements.
The Calcium and Vitamin D Foundation
Calcium and vitamin D remain important building blocks for bone health:
Calcium
- Recommended intake: 1,000 mg per day for men aged 50 to 70 and women aged 19 to 50. 1,200 mg per day for women over 50 and men over 70.
- Best sources: Dairy products, fortified plant milks, sardines and canned salmon with bones, leafy greens (kale, broccoli, bok choy), and fortified foods.
- Supplement considerations: If you cannot meet your calcium needs through food, supplements can fill the gap. However, calcium supplements should be taken in doses of 500 mg or less at a time for optimal absorption, and high-dose supplementation without adequate vitamin D and exercise may not prevent fractures.
Vitamin D
- Recommended intake: 600 to 800 IU per day for most adults, though many experts recommend 1,000 to 2,000 IU daily, especially for those with documented deficiency.
- Sources: Sunlight exposure (living in Florida helps, though sun safety is important), fatty fish, fortified milk and orange juice, egg yolks, and supplements.
- Testing: A simple blood test can measure your vitamin D level. Deficiency is common, especially in older adults, and supplementation should be guided by your results.
Beyond Calcium and Vitamin D
Weight-Bearing Exercise
Exercise is one of the most powerful tools for building and maintaining bone density. Weight-bearing and resistance exercises apply mechanical stress to bones, stimulating them to become stronger.
The most beneficial exercises for bone health include:
- Weight-bearing aerobic exercise: Walking, jogging, dancing, stair climbing, and hiking. These activities force your bones to work against gravity.
- Resistance training: Weightlifting, resistance bands, and bodyweight exercises such as squats, lunges, and push-ups. Muscle contractions pull on bones, stimulating growth.
- Balance exercises: Fall prevention exercises including tai chi, single-leg stands, and heel-to-toe walking. While these do not directly build bone, preventing falls prevents the fractures that are the real danger of osteoporosis.
Swimming and cycling, while excellent for cardiovascular health, are not weight-bearing and provide less bone-building benefit. Ideally, your exercise routine includes both weight-bearing activities and resistance training.
Protein Intake
Protein makes up approximately 50 percent of bone volume and one-third of bone mass. Adequate protein intake is essential for maintaining bone strength, yet many older adults consume less protein than they need.
Current research suggests that adults over 50 should consume 1.0 to 1.2 grams of protein per kilogram of body weight per day, higher than the general recommendation of 0.8 grams. Good protein sources include lean meats, poultry, fish, eggs, dairy, legumes, and soy products.
Medications That Affect Bone Health
Several commonly prescribed medications can accelerate bone loss:
- Corticosteroids (prednisone): Even short courses reduce bone density. Long-term use is a major risk factor for osteoporotic fractures.
- Proton pump inhibitors (PPIs): Long-term use is associated with increased fracture risk.
- Certain antidepressants (SSRIs): Associated with modest decreases in bone density.
- Aromatase inhibitors: Used in breast cancer treatment, these significantly reduce bone density.
- Some diabetes medications: Thiazolidinediones (like pioglitazone) can decrease bone density.
- Thyroid medication excess: Taking too much thyroid hormone replacement can accelerate bone loss.
If you take any of these medications, discuss bone health monitoring with your healthcare provider.
Lifestyle Factors
- Smoking: Directly toxic to bone cells and reduces calcium absorption. Quitting smoking improves bone health.
- Excessive alcohol: More than two drinks per day interferes with calcium absorption and bone formation.
- Caffeine: Very high caffeine intake may slightly reduce calcium absorption, though moderate consumption (2 to 3 cups of coffee per day) is generally safe.
Bone Density Testing (DEXA Scan)
A DEXA scan is a painless, low-radiation X-ray that measures bone mineral density, typically at the hip and spine. The U.S. Preventive Services Task Force recommends screening for:
- All women aged 65 and older
- Younger women with risk factors for osteoporosis
- Men with clinical risk factors (guidelines vary, but screening is reasonable for men over 70 or those with risk factors)
Results are reported as a T-score:
- Above -1.0: Normal bone density
- -1.0 to -2.5: Osteopenia (low bone mass)
- Below -2.5: Osteoporosis
When Medication Is Needed
If your bone density indicates osteoporosis or if you have had a fragility fracture, your doctor may recommend bone-building medications in addition to lifestyle measures. Options include bisphosphonates (alendronate, risedronate), denosumab, and in some cases anabolic agents that stimulate new bone formation.
Building a Bone Health Plan
Optimal bone health requires a multifaceted approach:
- Adequate calcium from food first, supplements if needed
- Sufficient vitamin D, tested and supplemented appropriately
- Regular weight-bearing and resistance exercise
- Adequate protein intake
- Medication review for bone-depleting drugs
- Smoking cessation and moderate alcohol use
- Fall prevention strategies
- Bone density screening as recommended
Your annual physical is the ideal time to review your bone health risk factors and create a personalized prevention plan.
Concerned about bone health or due for a DEXA scan? Contact Zimmer Medical Group to schedule an evaluation. Strong bones are the foundation of an active, independent life.
