A few years before he died, Shawn got really into CrossFit. He was trying to get in better shape and thought maybe something that required extreme discipline was just what he needed. Plus, he had a group of friends at his work who were already part of a gym nearby. He could go at lunch. Once he started, he went almost every weekday and often on the weekends too. To supplement this new workout routine, he tried a variety of diets, including one where he didn’t eat any processed sugar at all (I hated that one, as it was no fun) and one where he put butter in his coffee.…