What are the dietary recommendations with atherosclerosis?

Healthy. A diet low in saturated fat, rich in omega 3 and 6 fatty acids, low in cholesterol. Basically a diet rich in fresh vegetables, fruits, nuts, fish - mediterranean diet -.
Avoid Processed Food. Atherosclerosis, typically starting in childhood, is primarily driven by lipoproteins (the proteins which transport fat in the water outside cells), not ingested fat per-se. From evidence, dietary sugars (converted into fat in our liver) are the bigger driver, not "natural" fats. The most important fat is the fat we have stored inside, transported by the lipoproteins & where these go. See nusi.Org.