We do this because we've bought into an aesthetic which is so singular and unrelentingly caught up with slimness that to go against it is to see ourselves as somehow disenfranchised, without purchase on what is considered attractive and appealing.
His book's greatest contribution is not in providing a set path forward, but in courageously and unrelentingly explaining the reality that surrounds us today and in showing the public how it is that we have arrived in our current predicament.