The study assesses biochemical markers of dyslipidemia and endothelial dysfunction, and omega-3 fatty acids in relation to risk of CVD among men and women diagnosed with type 2 diabetes in two large ongoing cohort studies, the Nurses Health Study (NHS) and Health Professionals Follow-up Study (HPFS). By 1998, 12,600 confirmed type 2 diabetic cases had already accumulated in the two cohorts. By the year 2002, 5,507 blood samples prospectively collected from persons with previously or newly diagnosed type 2 diabetes will be available for analyses. Using this unparalleled resource, the investigators will evaluate (1) The relationship between plasma levels of cell adhesion molecules (i.e. sICAM-1, sVCAM-1, E-selectin), diabetic dyslipidemia, and risk of CVD among diabetics; (2) the association between Lp(a) concentrations and risk of CVD among diabetics, independent of high triglycerides and low HDL; (3) the association between long-term intakes of omega-3 fatty acids and CVD risk in diabetes. The main NHS and HPFS grants will provide follow-up and documentation of CVD in addition to covariate information. Overall, the large size of these cohorts, the prospective design, the high follow-up rates, and the availability of archived blood specimens provide a unique opportunity to study the relationship between diabetic dyslipidemia and risk of CVD in an extremely cost-efficient and timely manner. In addition, these two cohorts provide an unusual opportunity to compare lipid profiles and endothelial markers of CVD between diabetic men and women.