Waistline touted as key health indicator
He's confident that the waist-to-height ratio may soon eclipse the BMI as a measure of risk for lifestyle diseases such as cardiovascular disease, heart attack, stroke and diabetes.
Not so fast, says another expert: While the height-weight ratio has value, it needs to mature a bit to be more precise.
The ratio says waistlines should be no more than half of height, said Dr. Mario Morales, medical director of the SSM Weight-Loss Institute at DePaul Health Center.
For example, a 6-foot (72 inches) person should maintain a waistline of 36 inches, he said. Growing past that can lead to health risks, he said.
Recent studies show risks that developed from the 50 percent point grow with the waistlines, he said, to the point that people whose waistlines reach 80 percent of their height shortened their life spans by 17 years.
The latest research that excited Morales, a bariatric surgeon, was delivered in May at the 19th Congress on Obesity in Lyon, France.
The European study analyzed the health of more than 300,000 people and found the ratio was better able to predict high blood pressure, diabetes, heart attacks and strokes than BMI.
The new measure is "much more sensitive to (health risks) than BMI" because weight-to-height ratio takes into account "where the patients hold their weight: apple shape, pear shape," Morales said.
"Fat that's behind the abdominal wall is not just cells; it's called metabolic reactive fat. It creates (chemicals) that cause inflammation. Inflammation results in scar formation and can cause malfunction of the organs."
Carrying weight in other parts of the body is not so dangerous, Morales said. "If you carry weight in your hips or up around your chest, it's not so significant."
Another weight-loss expert, Dr. Samuel Klein, director of the Center for Human Nutrition at Washington University, called the measure promising, but "young."
Granted, the BMI can be an inaccurate predictor of risk for people who have excess muscle mass, such as athletes, Klein said, as well as be inaccurate for people who have lower BMIs but excess body fat and decreased muscle mass.
But that just means the measures should be used as one of many tools for physicians to diagnose a person's health risks, he said.
The weight-to-height ratio is consistent for all groups regardless of fitness, ethnicity, gender or age, Morales said.
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