Belly fat may be a better predictor of heart disease risk than BMI, study finds
The humble tape measure might just be a powerful tool for assessing heart health, according to a recent study that challenges conventional wisdom. While Body Mass Index (BMI) has long been used as a quick and easy way to gauge health risks, this research suggests that focusing on belly fat could provide a more accurate picture of cardiovascular health.
The study, published in JACC, the journal of the American College of Cardiology, analyzed data from over 250,000 adults over 20 years. It found that waist circumference and waist-to-hip ratio were more effective predictors of heart disease risk than BMI. In fact, nearly one in five individuals with a normal BMI but a high waist-to-hip ratio had up to 50% higher risk for several heart disease outcomes.
This finding is particularly intriguing because it highlights the limitations of BMI as a sole indicator of health. As Dr. Tara Narula, ABC News chief medical correspondent and a board-certified cardiologist, explains, "Body mass index doesn't tell us about fat versus lean mass. It doesn't tell us about the distribution of the fat."
The culprit behind this discrepancy is visceral fat, the fat stored around organs. This type of fat can lead to metabolic dysregulation, increasing inflammation, and raising blood pressure, blood sugar, and cholesterol levels. For women, a waist circumference of around 35 inches and a waist-to-hip ratio of 0.85 are considered elevated, while for men, these thresholds are around 40 inches and a waist-to-hip ratio of greater than 0.90.
So, what does this mean for you? Well, if your measurements fall into the elevated category, it might be time to have a chat with your doctor. According to Narula, taking your own measurements at home is a simple way to get a sense of your waist circumference and waist-to-hip ratio. Just ensure you measure without clothes on, grab a flexible tape measure, and measure at the highest point of your waist. For your hips, measure them at the widest point, then divide the waist measurement by the hip measurement.
This study's findings have significant implications for medical practice. By incorporating waist markers into routine health assessments, doctors can better identify individuals with a higher or lower cardiovascular risk than their BMI alone would suggest. As Narula emphasizes, "It tells us we really should be adding this into how we inform patients in the office using those waist markers."
In conclusion, this research highlights the importance of considering central adiposity, or belly fat, when assessing heart disease risk. It serves as a reminder that a comprehensive approach to health, one that takes into account the distribution of body fat, is essential for accurate risk prediction and effective patient care.
