Currently, they're in post-production for their film Fattitude, which includes interviews with body image activists, media figures, health professionals, and more.
Fat prejudice and body acceptance aren't issues affecting only people over a certain size — they are also relevant, as Averill and Lieberman say, to "anyone who hates his or her body or anyone who may someday become fat."
"The thing about fat-shaming and fat-hatred is that it's everywhere," Averill tells BuzzFeed Life.
"It becomes problematic when we wrap the term 'fat' with negative connotations," Lieberman says. "Fat is in the flesh of our bodies."
"In addition to fat people's suffering, people living in thin bodies are riddled and stymied by their fear of fatness," says Averill.
"The fear of fat has become our greatest distraction and waste of energy," Lieberman explains to BuzzFeed Life. "Can you imagine if you shifted the time you spent thinking negatively about your body to doing something positive for you and others?"