Re: what do you do
Atherosclerotic plaques are fat and cholesterol mostly. The problems arise when the plaques get larger, the body responds with a cellular inflammatory response. This can damage the arteries and lead to cell death and a calcification of the arterial wall and plaque which stiffens the artery. Complications then arise due to lower blood flow, vessel rupture and embolism.
So yeah, eating less fat will help, but fat build up will happen no matter what you do. I don't even think vegetarians are free of this. Maybe vegans.