Eligibility Criteria:
HIV positive subjects
Inclusion Criteria:
* age ≥40 and ≤75 years
* documented HIV infection
* participant report that combination antiretroviral therapy (cART) (any regimen) has been taken stably without \> 4 week interruption for at least 180 days prior to study entry (report of switching regimens in that time frame is permissible)
Exclusion Criteria:
* CD4 \< 100 cell/mm3
* current active AIDS-defining illness
* current active or recent (not fully resolved within 30 days prior to study entry) systemic bacterial, fungal, parasitic, or viral infections (except HIV, HBV, human papillomavirus \[HPV\], or HCV)
* current active cancer
* clinical ASCVD, as defined by 2013 ACC/AHA guidelines (including previous diagnosis of AMI, ACS, stable or unstable angina, coronary or other arterial revascularization, stroke, TIA, PAD), by subject report
* clinical diagnosis of HFpEF or HFrEF, by subject report
* diagnosed DM on antihyperglycemic medication
* current, active use of immune suppressant medication including oral or intravenous corticosteroid or injectable biologic (oral ASA or NSAID use permitted)
* eGFR \<45 ml/min/1.73 m2 calculated by CDK-EPI
* standard contraindications to MRI procedure based on MGH MRI Patient Procedure Screening Form - including history of severe allergy to gadolinium
* use of lipid lowering agents including statin drugs, fibrates, ezetimibe, red yeast rice, niacin or omega-3 fatty acids (\>3 grams/day in standalone formulations) in the 90 days prior to study entry
* use of ACE inhibitor, ARB, or aldosterone receptor blocker in the 90 days prior to study entry
* pregnancy or breastfeeding (female subjects of reproductive potential)
* other medical, psychiatric, or psychological condition that, in the opinion of the study investigator, would interfere with completion of study procedures
HIV negative subjects:
Inclusion Criteria:
• age ≥40 and ≤75 years
Exclusion Criteria:
* HIV infection
* current active or recent (not fully resolved within 30 days prior to study entry) systemic bacterial, fungal, parasitic, or viral infections (except HIV, HBV, human papillomavirus \[HPV\], or HCV)
* current active cancer
* clinical ASCVD, as defined by 2013 ACC/AHA guidelines (including previous diagnosis of AMI, ACS, stable or unstable angina, coronary or other arterial revascularization, stroke, TIA, PAD), by subject report
* clinical diagnosis of HFpEF or HFrEF, by subject report
* diagnosed DM on antihyperglycemic medication
* current, active use of immune suppressant medication including oral or intravenous corticosteroid or injectable biologic (oral ASA or NSAID use permitted)
* eGFR \<45 ml/min/1.73 m2 calculated by CDK-EPI
* standard contraindications to MRI procedure based on MGH MRI Patient Procedure Screening Form - including history of severe allergy to gadolinium
* use of lipid lowering agents including statin drugs, fibrates, ezetimibe, red yeast rice, niacin or omega-3 fatty acids (\>3 grams/day in standalone formulations) in the 90 days prior to study entry
* use of ACE inhibitor, ARB, or aldosterone receptor blocker in the 90 days prior to study entry
* pregnancy or breastfeeding (female subjects of reproductive potential)
* other medical, psychiatric, or psychological condition that, in the opinion of the study investigator, would interfere with completion of study procedures