BMI doesn't touch on cardiovascular fitness or body composition, Shape reported.
Researchers from the University of Copenhagen in Denmark analyzed the heights, weights, and mortality rates of more than 100,000 people.
Relate: Obesity in America
Obesity problem in America
New study: The healthiest BMI is actually 'overweight'
SAN FRANCISCO, CA - JUNE 10: Sugar is listed in the ingredients of a bottle of soda that is displayed in a cooler of a food truck on June 10, 2015 in San Francisco, California. The San Francisco board of supervisors has approved an ordinance that would require warning labels to be placed on advertisements for soda and sugary drinks to alert consumers of the risk of obesity, diabetes and tooth decay. The ordinance would also ban advertising of sugary drinks on city-owned property. If San Francisco mayor Ed Lee approves the measure, the law would be the first of its kind in the nation. (Photo by Justin Sullivan/Getty Images)
Michael Saucedo, age 9, showed his plate of chicken strips, chocolate milk, fruit cup, oranges and wheat bread, at Russell Cave Elementary School in Lexington, Ky., Wednesday, Jan. 13, 2010. The chicken strips are fried before arriving at the school, then are reheated using a steam and convection oven. Debate in Washington over a controversial school lunch waiver has spread into the Bluegrass State, where proponents say the innocuous proposal helps rural schools, and which critics argue threatens years of work combating one of the nationÃs largest childhood obesity rates. The House of Representatives is expected to vote this week on an appropriations bill that includes the waiver provision. (Pablo Alcala/Lexington Herald-Leader/MCT via Getty Images)
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They found obesity isn't as dangerous as it used to be. In fact, they found the overall mortality rate for obese people (BMI of 30 or greater) is no longer higher than it is for people of normal weight (BMI between 18.5 and 24.9).