One of the biggest issues presented in the documentary Super Size Me was obesity.
From my prospective, in the documentary I saw kids as very vulnerable to becoming obese because of all the media and money spent into advertising junk food directed specifically to young children. For example "To advertise candy, HERSHEY foods spent a mere 200 million dollars internationally" said Morgan Spurlock
In America there are many obese children and they are rapidly growing. If more and more adults are obese in America that causes a very high chance for their children to be obese (because of genetic reasons) and if their children become obese then when they're older their children will become obese and so on.
Also I think that children need to have sport at least 4 or 3 times a week instead of once a week and only for 45 minutes. 45 minutes a week isn't adequate for the children to maintain a good weight and health.
Another things is that a lot school administrators need to change their school menus for the better and need to remove a lot of the junk foods from their menus. Stop using a lot of frozen preserved foods and need to serve more fresh food. Meaning less foods with really high counts of calories and less sugary drinks.
FYI (for your information) in 2008 it was estimated that a whopping $147 billion dollars was the cost of obesity in the U.S.
In the film it went to show that there were many dangers and effects to a person's health with being obese and having fast food as a daily thing.
For Morgan Spurlock fast food caused him headaches, depression, chest pains, shortness of breath, sexual dysfunction, really high cholesterol,