Super Size Me (Sony, 2004, PG-13)
When Morgan Spurlock was growing up, his mother made the family's meals at home; they ate at restaurants only on very rare, special occasions. Once a common scenario, it is no longer true for Fast Food America.
Spurlock, young, healthy, and in fine physical condition, turned himself into a human guinea pig to investigate the health effects of fast food: For 30 days, he ate at McDonalds, and only McDonalds, three meals a day, every day. His progress (regress) was evaluated and monitored by three doctors, who expected to see no more problems from his change of diet than a moderate rise in his triglyceride levels. Instead, nearly every aspect of his physical and mental health disintegrated rapidly; it took him more than a year to recover from his month-long binge.
Super Size Me is a dramatic condemnation of the fast food industry, and even more so of modern America's eating habits. However, it would have been more effective, if less dramatic, had Spurlock have eaten reasonably instead of deliberately (and sickeningly) gorging himself at every meal. He conflates problems of food quality and food quantity, muddying the results.
The movie is somewhat interesting, but I'd rate it worse than PG-13 for sexual content and language. Unlike some reviewers, I don't find the graphic bariatric surgery to be a problem, but I wouldn't watch it while eating.