 Procedures: Eligible participants will be randomized to either the experimental n 10 or control group n 10 and scheduled for baseline data collection. Laboratory, demographic, and anthropometric assessments will be completed UABs Clinical Research Unit CRU. Baseline data will include: demographic questionnaire, oral glucose tolerance test OGTT, inflammatory assays and lipid panel as well as an anthropometric evaluation. In addition, participants will be provided training related to the assessment of urine ketones, including a visual aidhandout that displays the color rubric and corresponding numeric value. Even though all snacks and meals for the KD group will be provided, experimental group participants will receive nutritional counseling related to the KD and provided with handouts that highlight important components of a KD so that participants can remain adherent to the intervention even if eating in a restaurant or in other social settings. After completion of the aforementioned items, participants will be escorted to the UAB Hospital cafeteria and provided a voucher for breakfast prior to completion of cognition assessments. After breakfast completion, participants will return to the CRU for completion of the cognitive battery in a private conference room. Completion of the questionnaires will be completed on a laptop computer that is secured by PGP Whole Disk Encryption software to ensure participant confidentialityprivacy. After completion of the cognitive battery, individuals randomized to the experimental group and willingeligible to undergo MRI testing, will be escorted to the UAB Highlands radiology department. Delivery of mealssnacks week 1 will begin the week following baseline data collection. Bi-weekly phone conferences will be conducted with all participants to maintain participant contact as well as to assess for intervention adherence, challenges, and answer questions. In addition, all participants will complete a urine ketone assessment on weeks 4 and 8 and report those findings during conference calls. Note: Participants prescribed medications known to cause abnormal urine color i.e., azo dyes, nitrofurantoin, and riboflavin or affect the results levodopa, hydrozyqinaline, methyldopacaptopril or who report difficulty distinguishing differences between colors will return to UABs CRU for serum ketone analysis at weeks 4 and 8. In addition, a survey will be administered to the KD group to determine what participants liked and did not like about the diet week 12. All participants will be compensated for their time as follows: 1 Baseline and post intervention wk 12 laboratory and cognitive assessments, 50visit N 20; 2 MRI completion n 5, 50scan; 3 Ketone assessment wks 4 and 8, n 20, 10 each; and 4 Six-week post intervention cognitive assessment wk 18, N 20, 25. 