The article below specifically states that it can be reversed and cites studies.

Ornish, at the University of California San Francisco School of Medicine, reported the findings of his Lifestyle Heart Trial in the British medical journal Lancet in 1990. Regression was observed in 82 percent of those cardiac patients in the lifestyle intervention group following a regimen of aerobic exercise, low-fat vegetarian diet, smoke cessation and group behavioral support. By contrast, 53 percent of the control patients exhibited plaque progression. This is the first time in the history of medicine that regression, accompanied by a significant reduction in cardiac events, has been achieved with lifestyle changes alone.

link

Here are some more.
http://www.lewrockwell.com/sardi/sardi42.html http://www.thedoctorwillseeyounow.com/articles/heart/reversal_11/ http://www.washington.edu/newsroom/news/2001archive/11-01archive/k112801.html http://www.csmc.edu/6189.html

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Bill
Yamaha PSR2000