Commenting on an earlier post, living400lbs asked:
…so, are you thinking that a BMI of 14 or 16 isn’t an “unhealthy weight”?
(I tried to reply in the blog’s dashboard but it didn’t work. Good luck, I guess, because the response makes a decent post of its own.) Anyway, I wasn’t saying that, just saying that “healthy weight” isn’t a useful concept. If someone is that thin and is also unhealthy, even if the low weight is causing health problems, something else is causing the low weight, be it illness, disorder, or just an unhappy circumstance that needs to be corrected.
Example: When I was at my current height of 6′ and weighed 140 lb, I was thin because I was (temporarily) poor; when that was corrected, the weight came back. (That was many years ago, when I was in college. I didn’t get fat until I was middle-aged.)
My own experience of being thin is probably not typical, at least in the US. And I’m wary of sounding off on the health issues of the very thin, an area I haven’t researched. But, let’s say a person has anorexia nervosa and has become very thin and has health issues as a result. Would telling that person that s/he has an “unhealthy weight” help that person?
PS: I know that, statistically, people with BMIs of 25 to 29 (“overweight”, what I would call chubby) live the longest. But I also know that individuals outside this range (both fat and thin) can live long, so that’s another reason not to label a particular weight as unhealthy.