[quote]Christian Thibaudeau wrote:
[quote]Gmoore17 wrote:
[quote]americaninsweden wrote:
[quote]LankyMofo wrote:
Studies that do not have perfect parameters for the population we are discussing can be used to extrapolate into the population we are discussing. It doesn’t make it a perfect science, it doesn’t make it a scientific law, but to dismiss it as being completely not relevant is a little foolish, IMO. [/quote]
The problem is that the study given isn’t even close. Not close.
First, the population is different than the population we are talking about.
Second, BMI is not a measure of body fat.
If this study measured body fat vs insulin sensitivity and showed the same results then you could maybe, try and extrapolate them to a more broad population. However, the study doesn’t do that, nor does it try to do it. I am very confident that the researchers that did this study would not attempt to claim that body fat and insulin levels should be extrapolated out of this data. If they wanted to do this, they would have tested body fat instead of bmi.[/quote]
Many studies use BMI as basically a representation of bodyfat because it’s a much cheaper and easier thing to measure. On an individual basis it is shite, but when looking at a large population, the people with the higher BMI will generally have more bodyfat, so they often do try to extrapolate it in that way.
If the study was done on bodybuilders, or athletes, then yes BMI would be a terrible indicator of bodyfat, but it’s done on a regular healthy population, so it’s not a far stretch. I think it’s more the fact that it was done on regular people, and not bodybuilders, that does make it harder to extrapolate. But that doesn’t mean we should dismiss and ignore it, as lanky pointed out.[/quote]
When it was developed, it wasn’t even meant as a measure of body composition. It was actually developed by insurance companies to quickly evaluate the risk of heart disease in clients without having them do a full medical.
From there they invented the “healthy weight” scale which was eventually stolen by the exercise science field.[/quote]
The reason insurance companies created it was because it has some degree of accuracy among the large population when evaluating heart disease risk, which is directly related to body weight in the general population. I agree the study isn’t perfect, but dismissing it is equally ridiculous as claiming it is perfect.
Furthermore, there are several individuals in this thread, including a pro bodybuilder sharing anecdotal experiences that their insulin sensitivity is better while being leaner. While this is not scientific fact, people in this thread have said that bodybuilding has remained ahead of science in some areas in part due to these types of body experiments that get performed in gyms across the country.
If all of this isn’t enough evidence to cause one to consider the possibility that the correlation between body fat and insulin sensitivity is legitimate, well then I don’t know. But the last thing people should be doing are claiming it isn’t correlated because it hasn’t been proven by a study.