books.google.co.uk - With respect to both physical activity and nutrition, lifestyles of most young Americans have changed dramatically over time. Decades ago, young people often walked miles to attend school, visit friends, or even see a doctor. There was no television to watch, and no Internet to provide hours of visiting...http://books.google.co.uk/books/about/Overweight.html?id=jQsREuwDUlsC&utm_source=gb-gplus-shareOverweight
