So I was reading about a study from a few years back which found that the overweight bmi range had the lowest mortality (and moderate obesity on par with the normal range). When this study came out there was a bit of an uproar and some folks from Harvard came out and said that they didn't control for smoking (they had and the results were the same).
Smoking makes you thin and it kills you.
Eating junk food makes you fat and it kills you.
Not exercising makes you fat and it kills you.
So my question is, what's the difference between these variables? why control for one unhealthy behaviour and not the other?
Smoking makes you thin and it kills you.
Eating junk food makes you fat and it kills you.
Not exercising makes you fat and it kills you.
So my question is, what's the difference between these variables? why control for one unhealthy behaviour and not the other?