Why do you think Americans suffer from obesity more than other nationalites?

It just seems that more and more americans are struggling to resolve their problem with being obese with extreme surgeries lately.

Lifestyle and culture. I went to Amsterdam and hardly anyone owns a car, but everyone gets around on a bicycle. The portions of food were really small, yet when the meal was done we were full. A cup of coffee was about 8 ounces of coffee not a venti sugar festival. They also took multiple food breaks eating almost every 3 hours. All these things keep you metabolism up, but take a lot of time. America is a corporation trying to squeeze as much work as they can out of us before they are forced to put us on so many prescriptions to prolong our lives.

I have 2 Aunts in Europe (my mother's sisters). They are both in their 80s. My mother past away at 75 with multiple serious health issues that neither of her sisters have (Congestive heart failure, kidney failure, gout, glaucoma, high blood pressure). I went to visit my 80 year old Aunts recently and they walk to town every day to buy their food. They eat whole foods (not this fat free light chemical stuff we force ourselves to eat) but real milk and real bread. Everything is made fresh in a bakery or butchers. They also drink a lot (with every meal there is either beer or wine). Yet they are active and healthy while their American counterpart is dead.

When you buy a hamburger at McDonald's it is mostly fillers and not even real meat. That is why they have a unique taste.

because of all the fast food restaraunts, and entertainment stuff that make people sit in their asses allday everyday
BIG portion of food at one time.
I think so. America is the land of excess. We've got excess homes, excess electronics, excess stuff, excess food and excess portions. Most americans have no idea what a proper food portion is thus overeat frequently when they're cooking at home or dining out. Additionally, healthy food is more expensive than junk food and during a struggling economy people end up buying food that is less healthy because it's less expensive.
Fast food, laziness....
Americans have become very lazy over the generations. We rely heavily on our cars, computers, TVs, cell phones, etc. Instead of walking 5 minutes to the corner store, we get in our cars and drive there. Instead of taking the kids outside, we sit on the couch and watch TV. It's getting really sad, I think, because it is starting to effect America's youth. Kids are becoming more and more over weight every year.
We eat to much fast food and would rather drive than walk or bicycle somewhere. we eat just to much food.