Neither Spurlock, 33, nor the three doctors who agreed to monitor his health during the experiment were prepared for the degree of ruin it would wreak on his body. Within days, he was vomiting up his burgers and battling with headaches and depression. And his sex drive vanished.
When Spurlock had finished, his liver, overwhelmed by saturated fats, had virtually turned to pate. "The liver test was the most shocking thing," said Dr Daryl Isaacs, who joined the team to watch over him. "It became very, very abnormal."