Comparison of the Short-Term Effect of Dietary Carbohydrate Restriction Versus Exogenous Ketone Supplementation on Myocardial Glucose Suppression and Timing to Achieve a State of Ketosis Using FDG PET/CT Serial Imaging

Inclusion Criteria: 1. Adult patients, at least 18 years of age 2. No history of cardiovascular disease, including hypertension, hyperlipidemia, coronary artery disease, cardiac surgery, arrhythmias per medical record review and/or self-report 3. No history of diabetes mellitus, chronic liver or kidney disease per medical record review and/or self-report. 4. Participants must be informed of the investigational nature of this study and provide written informed consent in accordance with institutional and federal guidelines prior to study-specific procedures. Exclusion Criteria: 1. Females who are pregnant or breast-feeding at the time of screening will not be eligible for this study. Female participants of child-bearing potential will have a urine or serum pregnancy test before the first study visit. 2. Inability to tolerate imaging procedures in the opinion of the investigator or treating physician. 3. Serious or unstable medical or psychological conditions that, in the opinion of the investigator would compromise the subject's safety or successful participation in the study.