Nevada professor discovers new way to calculate body's 'Maximum Weight Limit'

For immediate release: Sept. 18, 2009 Nevada professor discovers new way to calculate body's "Maximum Weight Limit" RENO, Nev. – Most of us are familiar with the term, Body Mass Index, or BMI, as an index to determine healthy body weight. But, calculating BMI involves a complex formula: weight in pounds is multiplied by 703, and then divided by height in inches squared. Charts or online calculators are then used to show a "healthy weight range" given an individual's height that corresponds to the "healthy range BMI." For example, a BMI chart indicates that a healthy range BMI of 19 to 24 translates to a "healthy weight range" of 120 to 150 pounds for a 5-foot, 6-inch individual.

If this sounds way too complicated to you, you're not alone. George Fernandez, a professor of applied statistics and director of the Center for Research Design and Analysis at the University of Nevada, Reno, set out to give people a simpler way of calculating their healthy weight, and one that wouldn't require charts or online calculators. In addition, he doesn't think the "range" approach sticks in individuals' minds.

"We need a "Maximum Weight Limit, or MWL," he said, "one number that we know we can't go over, just like a speed limit."

So, using SAS software and statistical procedures, he discovered a much simpler way of calculating a Maximum Weight Limit, which closely corresponds to weight recommendations listed on BMI charts. But, you don't need to calculate or know your BMI, nor do you need a chart or online calculator to figure out your Maximum Weight Limit. Fernandez will present his Maximum Weight Limit calculation at the Nevada Public Health Association Conference, 1:30 p.m., Sept. 22 at the University of Nevada, Reno's Joe Crowley Student Union, Room 423.

"It's a very simple calculation that most of us can do in our heads," he explained. For men and women, there is a baseline height and weight. For men, the baseline is 5-feet, 9-inches tall and a Maximum Weight Limit of 175 pounds, meaning that a 5-foot, 9-inch tall man should weigh no more than 175 pounds. For women, the baseline is 5-feet tall and a Maximum Weight Limit of 125 pounds.

"These are nice round numbers that people can easily remember: 5-feet, 9-inches tall, 175 pounds for man; and 5-feet tall, 125 pounds for a woman," explained Fernandez.