In the loop above, an increase in obesity leads to a decrease in quality of health. Jamie’s manifesto cites cancer, heart disease, stroke and diabetes as health conditions caused by obesity. As our health problems increase we will come under more pressure from health professionals and those who care for us to address our diet and hopefully our diet improves as a result and we will become less obese. Once around the loop and we have changed the original behaviour we started with.

Our diagrams can grow to be quite complicated as we explore the way we believe a system works.