"The INTERHEART study of 30,000 men and women in 52 countries showed that at least 90 percent of heart disease is lifestyle related; a European study of more than 23,000 Germans showed that people with healthier lifestyles had an 81 percent lower risk."
hmm, maybe not:
"While I agree with your general premise, you need to reanalyze some of the definitive statements you make. Type 2 diabetes can be prevented in many people, but it is not caused entirely by diet (quite the contrary). Type 2 diabetics have a genetic predisposition for Type 2 that is triggered by diet and health. Meaning some people can do everything in the power to prevent getting it, but still get it. While others could live an incredibly unhealthy lifestyle, but still not get it. We can prevent a lot, but not all. The same goes for heart disease and many of the other diseases that you mentioned." -- random comment on article