In his advocacy against childhood obesity, Banzhaf has criticized McDonald's. In 2002, he filed a lawsuit claiming product liability against McDonald's, claiming that false advertising by McDonald's contributes to childhood obesity. Obesity and McDonald's were discussed in the 2004 film "Super Size Me" by Morgan Spurlock, in which Banzhaf is repeatedly interviewed. In one scene, Spurlock and Banzhaf have a discussion while eating at McDonald's. In his 2005 book, Spurlock quoted Banzhaf explanation of why litigious campaigns have had more success than legislative campaigns: