As Sabrina Strings explains in her book, Fearing the Black Body, the answer is much more complicated than health or aesthetics. She argues that the origins of modern-day fat phobia can be traced all the way back to slavery and that Black people are still dealing with the consequences.
Follow Sabrina on Twitter @SaStrings and read her op-ed discussed in the interview here.
Email the show at shortwave [at] npr.org.