Physical inactivity accounts for approximately what percentage of ischemic heart disease?

• A. 10%
• B. 20%
• C. 30%
• D. 40%

Answer: (C)

Physical inactivity is a major modifiable risk factor for ischemic heart disease, and when we estimate the public-health impact, we look at how much of the disease could be prevented if activity were raised to recommended levels. The figure around 30% represents the population-attributable fraction for ischemic heart disease due to inactivity—a sizable portion, reflecting how lack of activity worsens blood pressure, lipid profiles, glucose control, weight, and overall vascular health. This substantial share is why promoting regular physical activity has such a strong preventive effect on heart disease. The other options underestimate or overestimate that impact, whereas 30% aligns with the established estimate of how much ischemic heart disease could be reduced with increased activity.