Morgan
Morgan decides to go on a 30 diet that consists solely of products from the menu at McDonald's. He experiences weight gain, mood swings and sexual disfunction during the periods and even heart palpitations that concern his doctor enough to cause them to ask him to stop the experiment. He completes the challenge and we learn that it takes him 14 months to lose the weight he put on in the one month period of time it took to put it on.
Alex
Alex is Morgan's girlfriend who is a vegan chef is a part of Morgan's journey during the film. She watches as his health begins to fail and he has sexual disfunction, mood swings and even greater health effects during the time period. Alex also supervises Morgan's diet after the experiment in order to help him to lose the weight he has put on which took 14 months.