The formula for BMI — weight in kilograms divided by the square of height in meters — was invented in the early 19th century as an easy measurement of obesity in the general population and not necessarily for individual fatness, according to NPR.
BMI is still used regularly today by medical professionals to determine if a person has a healthy amount of body fat.
Though it can be useful in a general sense, BMI misses important factors such as family history, genetics, lifestyle, age, sex, and muscle mass when considering a person's overall health and their risks of developing diseases.
In fact, many people who are considered in the "normal" BMI range were found to be unhealthy based on other factors, a UCLA-led study released in 2016 found.
Here are seven signs that you're actually healthy, even if your BMI says you have overweight or obesity.