Can a Plant-Based diet restore blood flow in the Heart's small vessels?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Women must be postmenopausal. * History of angina, ischemic symptoms, or symptoms consistent with ischemia in the absence of obstructive coronary artery disease. * No obstructive coronary artery disease (\<50% stenosis in any epicardial coronary artery or fractional flow reserve \>0.80). * Clinically documented coronary microvascular dysfunction (CMD), including coronary flow reserve \<2.5 and/or index of microcirculatory resistance ≥25, or equivalent documentation in the medical record. * Stable cardiometabolic medication regimen for at least 2 months before enrollment. * Willingness to consume the study-provided plant-based diet and complete all study procedures. * Ability to provide informed consent Exclusion: * Obstructive coronary artery disease or prior coronary revascularization (PCI or CABG). * Recent acute coronary syndrome, unstable angina, decompensated heart failure, or other clinically unstable cardiovascular disease. * Significant structural heart disease, uncontrolled arrhythmia, severe uncontrolled hypertension, or symptomatic hypotension. * Severe renal disease (eGFR \<30 mL/min/1.73 m²) or significant liver disease. * Current vegetarian or vegan diet, or habitual consumption of ≤4 servings of animal products per week. * Severe food allergies, dietary restrictions, or gastrointestinal conditions that would prevent adherence to the study diet. * Current use of weight-loss medications, including GLP-1 receptor agonists. * Active eating disorder. * Recent (\>5%) intentional or unintentional weight change within the previous 3 months. * Participation in another interventional study that could affect study outcomes. * Any medical, psychiatric, or social condition that, in the investigator's judgment, would make participation unsafe or interfere with study completion.