This was a multicenter , randomized , primary prevention field trial of cardiovascular disease ( Prevencin con Dieta Mediterrnea ( PREDIMED Study ) ) based on community-dwelling men aged 55 to 80 years and women aged 60 to 80 years at high risk of cardiovascular disease ( 51 % of them had type 2 diabetes ; DM2 ) attending primary care centers affiliated with 11 Spanish teaching hospitals .