In addition, he seeks medical supervision in order to provide expert testimonies regarding his health before, during, and after consuming a diet strictly composed of fast food over the course of a month. By comparing his initial weight of one hundred eighty five pounds and eleven percent body fat to his resulting weight of two hundred pounds and eighteen percent body fat, the doctors are able to provide medical insight on what rapid damage fast food can inflict upon the human body, internally as well as externally. Further analysis of the weight gain suggests that Spurlock's liver has turned to fat, and his chance of encountering heart failure has doubled due to his poor diet. Such shocking statistics would not have been discoverable had there been no professional involvement, and the public would not have been able to understand the severity in which ones health can fail on account of frequent fast food visits. Because of this, the doctors and nutritionists played a vital role in persuading the audience in favor of the overall claim. Therefore, the factually based statistics and medical expertise are included in the film in order to provide effective, logical evidence that aids in supporting Spurlock's argument. .
In addition to using their credentials for logistical support, Spurlock also uses the position of such doctors, as well as his own health, to provide ethical support through the appeal of ethos. Involving doctors in his experiment is not only wise due to the knowledge and medical statistics they can supply, but also due to the superior expertise that materializes along with a degree. Because doctors are specialized in medical fields, the average American is extremely likely to trust their judgment. For instance, directly following the experiment, one specialist strongly advises Spurlock to resist his cravings for fast food for at least a year in order for him to return to his initial health and weight.
