- six big fat myths about fat: a podcast with David Gillespie (plus I’m giving away 5 copies of his new book!) You may remember David Gillespie from previous discussions such as Why Sugar is Really Grim For You. He’s the author of Sweet Poison and over the past 13 months since I quit sugar we’ve been in regular dialogue. Sometimes we talk about the fact that much of what we know about sugar and fat is more