The Body Mass Index is a popular way to measure and assess whether someone is overweight or underweight. Basically, it's just your weight divided by your height. BMI is a simple system, but it does have some flaws. Over at the Obesity Panacea blog, Peter Janiszewski (who has a Ph.D. in exercise physiology) has a nice post explaining why BMI is sometimes useful, and also why it's not a great measurement of individual health.
Right now, I bet you're chomping at the bit with, "Yeah! The BMI doesn't distinguish between fat and muscle!" And you're right. It doesn't. A simple BMI measurement would tell you that The Rock is no different than an out-of-shape couch potato of the same height and weight. Obviously, that's a flaw in the system. But it's not the most important flaw, Janiszewki argues. In fact, he says, this well-known problem with BMI is the easiest one to work around. A simple visual check can tell your doctor whether your high BMI is due to excess muscle or excess fat.
The real problems with BMI, he says, are a lot more complicated. For one thing, the system doesn't distinguish between very real differences in health outcomes for different body types. "Pears" and "Apples" might have the same BMI, but with opposite health results. Even more troubling: You can change your lifestyle, and become objectively healthier, and your BMI might not budge.
This is particularly so if you adopt a physically active lifestyle, along with a balanced diet, but are not necessarily cutting a whole lot of calories. This lack of change in BMI or body weight is all too often interpreted as a failure, resulting in the disappointed individual resuming their inactive lifestyle and unhealthy eating patterns.
However, as we have argued most recently in a paper in the Canadian Journal of Cardiology, several lines of evidence suggest that weight loss or changes in BMI are not absolutely necessary to observe substantial health benefit from a healthy lifestyle. Thus, an apparent resistance to weight-loss should never be a reason for stopping your healthy behaviours.
Read the rest at Obesity Panacea
Image: Wisley Taste of Autumn: Europom, a Creative Commons Attribution (2.0) image from rictor-and-david's photostream
At Blue Hill, Maine’s George Stevens Academy, there lies a Twinkie that was the subject of teacher Roger Bennatti’s 1976 science lesson on chemical preservatives and shelf life. Now the immortal snack cake sits in a glass case on the desk of the school’s Dean of Students Libby Rosemeier who was a student in the […]
In the early 1970s, Princeton University physicist Gerard O’Neill became a space activist touting plans to build human colonies in outer space. He argued that humans could escape (while helping alleviate) the environmental damage we are causing on Earth by migrating to space habitats housed in cylinders that would be suspended 250,000 miles from Earth […]
In a new scientific study, McGill University researcher Jay Olson combined stage magic with psychology to make people think that an fMRI machine (actually a fake) could read their minds and implant thoughts in their heads. Essentially, Olson and his colleagues used “mentalist” gimmicks to do the ESP and “thought insertion” but convinced the subjects […]
Drones are hot items, but where to start? Check out our assortment of 5 of the best drone models on the market, and get to work building your own aerial armada. And don’t forget to add coupon code DRONE10 for 10% off your purchase of any one of these drones, courtesy of the Boing Boing Store.Code Black Drone […]
If you’ve got a coding career on your mind, few programming disciplines will take you farther than a commanding knowledge of the Python language, which is not to be mistaken for parseltongue. Its versatility and ease of use make it a go-to for any coding project…so master Python now with this all-inclusive all-level python programming course […]
The realm of web development is constantly evolving. New platforms, languages, and processes materialize all the time, so staying on top of all that innovation is a tall order.Whether you’re brushing up on new tricks, starting from scratch, or just looking to make your own website a little jazzier, Rob Percival’s new Complete Web Developer Course 2.0 (now […]