NPA personality theory
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Re: N types with large spleens
While I am not familiar with the gene mentioned there, it is fascinating to try to figure these issues out. We find a strong tendency for N types to be taller, however ethnicity plays a part and eastern populations seem to vary in that. Tallness seems to go along with larger visceral organs (such as colon and spleen) and at least the colon is known to be of greater total surface area in taller people. This may be one reason that colon cancer is more frequent in those with greater height.
Well, it's all very complicated and intriguing how we see NPA principles interact with medicine in general as well as in evolution and natural selection. In seeing patients, I am always looking out for any way to improve screening and prediction of their health risks, and this body of knowledge is part of that effort.