Ah, nice to see it put so clearly:

Originally Posted By: Art_in_FL

http://scienceblogs.com/obesitypanacea/2010/03/body_mass_index_bmi_as_a_measu.php

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.

... In fact, significant reductions in fat mass often occur concurrent with equal increases in muscle mass in response to physical activity - equal but opposite (and beneficial!) changes which are not detected by alterations in body weight on the bathroom scale, and thus BMI.


In short: MOVE MORE! And... eat less. And adjust your intake away from sugar and junk food towards quality stuff.