While some of the causes of this health trend may seem obvious, there are some other less well-known theories.

7 Possible Answers Millions of Americans are considered clinically obese. While these theories can be debated by experts and regular folk, everyone agrees that something must be done about the obesity problem. Americans have now gotten used to eating larger portions per meal and that can translate into their own kitchens. What Are the Main Causes of Obesity in America Today. In the past 30 years the amount of obese children and adults has literally exploded in the U.S.

There is a tendency to cook and serve larger meals at home too. Seems like many restaurants offer huge serving sizes for everything from a chef salad, to spaghetti and meatballs, to a steak dinner. Most people have been raised to finish everything on their plate and when someone sits a giant plate of food down in front of you, you're more likely to try and finish it without even thinking much about it.

The "Super Size" mentality doesn't just belong to the fast food industry.