In one analysis, a typical American population that departed even modestly from the Western diet (and lifestyle) could reduce its chances of getting coronary heart disease by 80 percent, its chances of type 2 diabetes by 90 percent, and its chances of colon cancer by 70 percent.2
More data is needed. Example: how many people were in this study. What where their initial conditions? How long were they on the new diet/lifestyle? Ages of subjects? Gender?