In January of 2010, Morgan Spurlock ate nothing but McDonald’s for thirty days as part of an experiment to see the effects of a diet of McDonald’s food on his health. He ate breakfast, lunch, and dinner at McDonald’s every day for the month, consuming an average of 2,000 to 2,500 calories per day. He did not exercise during the experiment.
Spurlock gained 11.1 pounds (5.0 kg) over the course of the month and his cholesterol level increased by 13%. He also experienced mood swings, felt nauseous and had headaches. A doctor who monitored Spurlock during the experiment said that his liver had begun to resemble that of someone who drinks alcohol excessively on a daily basis.
The experiment was not without its critics, who pointed out that Spurlock ate far more calories than the average person, and that his weight gain was due more to overeating in general than to the specific effects of McDonald’s food. However, Spurlock’s experiment does offer a glimpse into the possible health effects of a diet of fast food.