% ▁of ▁cases . ▁In ▁one ▁study , ▁women ▁who ▁were ▁free ▁of ▁stress ▁from ▁work ▁life ▁saw ▁an ▁increase ▁in ▁the ▁diameter ▁of ▁their ▁blood ▁vessels , ▁leading ▁to ▁decre ased ▁pro gression ▁of ▁a ther os cl eros is . ▁In ▁contrast , ▁women ▁who ▁had ▁high ▁levels ▁of ▁work - related ▁stress ▁experienced ▁a ▁decrease ▁in ▁the ▁diameter ▁of ▁their ▁blood ▁vessels ▁and ▁significantly ▁increased ▁disease ▁pro gression . ▁Having ▁a ▁type ▁A ▁behavior ▁pattern , ▁a ▁group ▁of ▁person ality ▁characteristics ▁including ▁time ▁ur gency , ▁compet it iveness , ▁host ility , ▁and ▁imp atience , ▁is ▁linked ▁to ▁an ▁increased ▁risk ▁of ▁coron ary ▁disease . ▁ ▁Blood ▁f ats ▁High ▁blood ▁ch ol ester ol ▁( specific ally , ▁ser um ▁L DL ▁concentr ations ). ▁HD L ▁( high ▁density ▁li pop rote in ) ▁has ▁a ▁protect ive ▁effect ▁over ▁development ▁of ▁coron ary ▁ar tery ▁disease . ▁High ▁blood ▁trig ly cer ides ▁may ▁play ▁a ▁role . ▁ ▁High ▁levels ▁of ▁li pop rote in ( a ), ▁a ▁comp ound ▁formed ▁when ▁L DL ▁ch ol ester ol ▁comb ines ▁with ▁a ▁protein ▁known ▁as ▁ap ol ip op rote in ( a ). ▁ ▁Diet ary ▁ch ol ester ol ▁does ▁not ▁appear ▁to ▁have ▁a ▁significant ▁effect ▁on ▁blood ▁ch ol ester ol ▁and ▁thus ▁recommend ations ▁about ▁its ▁consumption ▁may ▁not ▁be ▁needed . ▁S atur ated ▁fat ▁is ▁still ▁a ▁concern . ▁ ▁Gen et ics ▁The