A high school biology teacher from Ankeny, Iowa, documented the changes his body went through during the three months that he consumed nothing but McDonald’s.
Compared to the man featured in the 2004 documentary “Super Size Me,” who ate at the fast-food chain for a month, John Cisna surprisingly lost 37 pounds and his cholesterol dropped from 249 to 170, KCCI reported.
His low-density lipoprotein, or “bad cholesterol,” also dropped from 173 to 113.
Cisna started the diet as an experiment, demonstrating how people can eat anything as long as they stick with daily nutritional limitations of 2,000 calories and stay close to the recommended dietary allowances for nutrients such as carbohydrates, proteins, fat calories and cholesterol.
Cisna’s students planned out his daily meals using McDonald’s online nutritional information, making sure that they follow the nutritional limitations he set out.
During the experiment, Cisna, who says he didn’t exercise or watch his daily calorie intake before, began walking for 45 minutes a day, which was a contributing factor to the results.
When he paid a visit to his local McDonald’s to speak about the experiment, the manager was very interested to see what happens that he agreed to supply 90 days of meals for free.
For breakfast, Cisna would typically have two egg white, a bowl of maple oatmeal and 1 percent milk, and a salad for lunch.
"So this isn't something where you say 'well he went to McDonalds and he only had the salads,’” he said.
For dinner he would eat a value meal such as a Big Mac or a quarter pounder with cheese, and occasionally had ice cream sundaes.
Cisna was significantly healthier by day 90, despite the fast-food diet.
“I tell people not only can I see my shoes now but I can actually tie them,” he said.
According to the Daily Mail, Cisna’s experiment proved his theory that many people have the wrong idea when it comes to being healthy.
“The point behind this documentary is - it's choice. We all have choices,” he said. “It's our choices that make us fat, not McDonald's.”