Habits as medicine - Do You Want, Know and Believe?

Many people say they 'believe' that healthy lifestyle and eating habits are very important for health, and yet continue to have obviously unhealthy habits. Is it because they do not really know the true and tremendous power of healthy lifestyle and especially eating habits in preventing and combating the 'Deadly Quartet' of Diabetes, Hypertension, High Cholesterol, Obesity and other lifestyle-related chronic diseases? Or is it because they don't care or don't know how?