Weight/height ratio is negatively correlated with IQ, meaning the more you weigh for your height, the lower your IQ tends to be.  Almost everyone in the HBD-o-sphere assumes this correlation just means fat people tend to be dumb, which I don’t deny, but I’ve always thought it would be more interesting if low IQ muscular people were also driving the correlation.

A few weeks ago I discovered an interesting passage on page 321 of Wechsler’s Measurement and Appraisal of Adult Intelligence Fifth Edition:

…most studies report a small, but significant correlation (r of about 0.25) between IQ and Sheldon’s body type, with individuals of “tall and narrow build” (ectomorphs) earning on the average higher S-B or WAIS IQ’s than persons who are either chubby (endomorphs) or more muscular and athletically built (mesomorphs)…

This is interesting because:

a) as we evolved from ape to man, we lost muscle but gained height.

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Indeed in the film Quest for Fire,  set 80,000 years ago, the most advanced tribe had the least muscle, and would point and laugh at the more primitive muscular cavemen they captured.

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b) When we imagine advanced life visiting from other planets,  they are devoid of muscle.

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c) the stereotypical smart guy is a scrawny nerd while the stereotypical dumb guy is a roided up wrestler or football player.

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