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Researchers followed nearly 28,000 healthy women for over 20 years to understand which risk factors are most important for developing coronary heart disease (blockages in heart arteries) at different ages. The women were health professionals who were initially free of heart disease and were tracked from their mid-40s onward.

The study revealed that diabetes was by far the strongest predictor of heart disease at any age, but its impact was most dramatic in younger women. Women under 55 with diabetes had more than 10 times the risk of developing heart disease compared to those without diabetes. Other major risk factors for early heart disease included metabolic syndrome (a cluster of conditions including high blood sugar, excess belly fat, and abnormal cholesterol), high blood pressure, obesity, and smoking.

Among the approximately 50 different blood markers tested, "lipoprotein insulin resistance" - a measure of how well the body processes fats and sugar - showed the strongest association with heart disease in younger women. Traditional cholesterol markers like LDL ("bad" cholesterol) and triglycerides were also important, but their predictive power was weaker than insulin-related markers. Interestingly, most risk factors became less predictive as women got older, suggesting that metabolic health is particularly crucial for preventing early heart disease.

This research reinforces the critical importance of metabolic health optimization in preventive medicine. For patients interested in longevity, it highlights that managing blood sugar, insulin sensitivity, and metabolic syndrome may be even more important than focusing solely on cholesterol levels, particularly for preventing premature cardiovascular events.