A person whose BMI indicates they are overweight or obese is generally considered unhealthy. But 2016 research suggested that this was incorrect for 75 million Americans.

• Researchers found that 54 million Americans that were classed as overweight or obese were perfectly healthy when they considered the cardiometabolic measures (blood pressure, blood sugar, cholesterol, etc.)
• 21 Million people were classed normal in terms of BMI, but other cardiometabolic tests indicated they were unhealthy.

• BMI doesn't distinguish between body fat and muscle mass. Muscle weighs about 18 percent more than the same amount of fat. So, according to BMI, the muscled person is more overweight than a sedentary person.
• BMI is also not reliable to use on elderly ad...