Obesity as a modern problem

Nowadays there are a lot of countries where people suffers from obesity. And at the same time their level of fitness and health is decreasing day by day. What's the problem?
In my opinion this problem is true for developed countries but not for developing. I'm sure that in developed countries there are a lot of different types of products, food and services. And people in developed countries don't want to make the effort to have something else. They are used to being a consumer, they don't like to produce something useful. I can give you an example from my personal experience. I didn't have any opportunities to buy tasty food and go to a fitness club 5 years ago. I had to work a lot to pay for my education and a flat. It was very difficult but at that time I didn't have any problems with my weight and health at all. It's a paradox because I spent a lot of energy on work and trying to survive and I was healthier than I am now. Today I can afford to visit a fitness club every day, buy healthy food and use a lot of services but I'm lazier than I was 5 years ago.
In my opinion in developing countries there are not many problems with obesity. Of course their governments can't afford to provide a good health service but they do their best. People from developing countries don't have opportunities like us and in general they have to make more efforts to make their lives better. And it makes them healthier. We can compare people from developing countries with people from developed countries. I'm sure the level of living standards will be very different but if we compare a level of obesity, fitness and health it will be completely contrary. 

What should we do to solve this problem? In my point of view is that we have to promote fitness and other special healthy programmes in developed countries. It helps to stimulate people to make something for their lives by themselves. And also we can help developing countries to make their healthy and fitness services better and more available.
In conclusion I would like to mention that we shouldn't stop and carry on developing futher even when we have everything in our lives. And this modern trend in the level of obesity, health and fitness illustrates our problems clearly. Let's try to solve these difficulties together!