What lifestyle factor can negatively impact bone density?

• A. Regular exercise
• B. Smoking
• C. Increased water intake
• D. High fiber diet

Answer: (B)

Smoking is known to have detrimental effects on bone density. Nicotine and other harmful substances found in tobacco can interfere with the body's ability to absorb calcium, which is crucial for maintaining strong bones. Additionally, smoking can alter hormone levels, including decreasing estrogen in women, further contributing to a decline in bone density. This negative impact is compounded by the fact that smokers tend to have a higher risk of osteoporosis and fractures compared to non-smokers.

Regular exercise, on the other hand, promotes bone strength by stimulating bone formation and increasing bone mass through weight-bearing activities. Increased water intake is generally beneficial for overall health, including joint and bone health, as it helps maintain hydration and can support metabolic processes. A high fiber diet is also typically associated with various health benefits, including improved digestive health and potential protective effects against certain diseases, although it does not inherently have a direct negative impact on bone density. This context highlights why smoking stands out as a significant risk factor for decreased bone density.