Please read this paragraph from Dan Lewis's
"Now I Know" and tell me if it makes sense:
"... according to the New York Times, those with a BMI over under 17.5 are "at risk for health problems related to anorexia,"

It looks like a simple typo. No idea which one it should be. You might ask the author or check the NYT online.

From this article (and there is a link to the original NYT article), it looks like it was meant to be this:

quote:

Those under 17.5 are considered to be at risk for health problems related to anorexia. (However, young teenagers can have lower BMIs without necessarily being anorexic.)