Not specialised in Cardiology or Angiology or Dietology so I am sure experts on atherosclerosis could offer their insight . Atherosclerosis is a condition that is kind of natural as we age . It is the body collecting damage . There are already small arterial damages in children . So it is not only diet , or the free radicals etc . It is a complex phenomenon that includes hemodynamic forces on the walls of the arteries , the immune system that plays a big role on its formation , other inflamatory agents , muscle cell migration and lots of other stuff many of them unknown as of 2016 . I doubt diet could reverse it or even halt it , however I think a proper diet could help alot patients especially with diabetes , hypercholesterolemia , high TGC , smokers and people with other lifestyle aggravating factors . Especially a diet with antioxidants , low saturated fats and low refined carbohydrates .