How is it then that studies show a vegetarian diet contributes to a lower rate of heart attacks?

Loma Linda University of California decided to test 24,000 people to determine mortality rates from heart disease. They found that lacto-ovo vegetarians (including dairy and eggs) had 66% fewer deaths from heart disease than their meat-eating counterparts. Pure vegetarians had an impressive 90% fewer deaths than the meat-eaters.

http://www.healthrecipes.com/heart_attack.htm

Once again, I respectfully ask for links proving your theories.