Relationship Of Glucose And Insulin Levels To The Risk Of Myocardial Infarction A Case Control Study

This study examined whether blood sugar levels that aren't high enough to be considered diabetic could still increase heart attack risk. Researchers compared 300 people who had experienced their first heart attack with 300 similar people who hadn't, focusing on a South Asian population known to have higher rates of both heart disease and diabetes.

The findings were striking: people with blood sugar levels in the higher ranges of "normal" were much more likely to have had heart attacks. Those with fasting blood sugar levels above 5.2 mmol/L (about 94 mg/dL) were nearly 3 times more likely to have experienced a heart attack, even after excluding people with diabetes or pre-diabetes. The study found that a fasting glucose level of 4.9 mmol/L (88 mg/dL) was the best cutoff point for distinguishing between those who had heart attacks and those who didn't.

What makes this research particularly important is that it shows blood sugar acts as a continuous risk factor - meaning that even small increases in glucose levels correspond to increased heart attack risk, rather than there being a safe threshold below which risk disappears. The researchers also found that after eating, each 21 mg/dL increase in blood sugar was associated with a 58% higher odds of heart attack.

This research supports the clinical approach of monitoring and optimizing blood sugar levels even when they fall within traditionally "normal" ranges, as part of a comprehensive strategy for heart disease prevention and metabolic health optimization.