2. Excessive Caffeine
The concern: Caffeine mildly increases calcium excretion through urine—about 4–6 mg lost per 150 mg of caffeine (roughly one cup of coffee).
The threshold: Risk emerges with more than 400 mg daily (≈4 cups coffee) without adequate calcium intake.
The reassurance: Moderate coffee (1–3 cups) poses no threat when paired with calcium-rich foods. In fact, adding milk transforms your cup into bone support.
Your move: Limit to 2–3 cups daily. Stir in fortified plant milk or enjoy a yogurt alongside your brew.
3. Heavy Alcohol Consumption
The concern: Chronic heavy drinking (≥3 drinks daily) interferes with:
→ Calcium absorption in the gut
→ Vitamin D activation (essential for calcium uptake)
→ Osteoblast function (bone-building cells)
The evidence: Long-term heavy use correlates with higher fracture risk and accelerated osteoporosis.
The silver lining: Light-to-moderate intake (1 drink/day for women, 2 for men) shows neutral—or even protective—effects in some studies.
