The formal connection between personality and body type in
academic research goes back to 1940, when the psychologist William
Sheldon established the somatotypes, which are three generalized body
shapes that he theorized could be linked biogenetically to personality:
ectomorphs, mesomorphs, and endomorphs. Ectomorphs are people who are
tall and thin, and Sheldon expected them to be shy and anxious.
Mesomorphs are muscular and broad, and they’re expected to be
domineering and competitive. Endomorphs are soft and round, and they’re
assumed to be lazy and affection-seeking.Since 1940,
the somatotypes’ links to personality have been broadly debunked on a
scientific level, with everything from Sheldon’s study methods to his
assumptions about personality being called into question. And for good
reason: Somatotypes were a direct result of the academic popularity of
anthropometry and eugenics before World War II.
So fatphobic stereotypes trace back to discredited bad science and eugenics! How (not) surprising.