is decrease in physical activity causing obesity to children

That's a great question.

I believe that a decrese in physical activity is only part of the problem.  We know about cuts in physical education and recess and the increased amount of time kids spend on the computer and in front of the TV, but we also have to remember the diet and nutrition part of the equation.  If they're trying to be active, but still eating tons of junk (which is more readily available than, say, 50 years ago) then it doesn't do them any good.  So we want to encourage not only the kids, but the whole family and other places, like our schools, to serve healthy, whole foods and we all need to help teach kids why these are better choices and be the examples for them.

I agree with you.  Junk food is cheaper and much more convenient than healthier  foods.  Consumers need to be educated in what causes obesity and why it is that some kids can eat anything and remain skinny and others struggle with their weight even though they eat less.  The problem is that according to Dr. Ann de Wees who is the head of the Glycemic Research Institute, 50% of the population carries an obesity gene and some people have two, so it is extremely difficult for them to lose weight. 

This woman is amazing as she has done clinical research and have patented certain natural foods so that they are low glycemic and will not trigger the fat cells.  She has actually invented products that causes you to burn fat thermogenically even though you are not exercising.  I have listed the websites below for those of you that are interested in learning more.

For clinical research:

www.acaisweet.com

www.skinnyscience.com

www.skinnysciencecoffee.com

www.skinnysciencetea.com

She will be coming out with many other kid friendly foods such as chocolates, gummy bears, and chocolate and strawberry milk that will not cause kids to put on weight and help them to lose the fat.

The website to get the products is at www.boreshacoffee.com/pthomas

These products are based on nanotechnology and clinical trials.

Pat