The BMI is more right than wrong.  The strength of a physical object varies with cross-area, so the strength of your heart varies as height squared.  The amount of work it has to do varies as mass, which does tend to scale as height cubed.<p>The result is that height and heart disease are correlated.  See <a href="http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;25051127" rel="nofollow">http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;25051127</a> for a random verification.