Fasting ENHANCE Pilot Study

Inclusion Criteria: * Age ≥ 65 years; * Body Mass Index (BMI \> 25 kg/m2) * Normal age-, gender-, and education-adjusted performance on TICS-M (Telephone Interview for Cognitive Status) * Responds yes to questions 1 (memory worse), 2 (word finding difficulties) or 3 (planning/organization difficulties) on the Subjective Cognitive Decline Questionnaire * Reports onset of cognitive difficulties in past five years * Reports they believe they are worse than others their age OR they have talked to a clinician about it. * Provides informed consent and willing to be randomized to either intervention group. Exclusion Criteria: * Failure to provide informed consent; * Recent History or clinical manifestation of cardiovascular disease, diabetes, cholelithiasis, liver or renal disease, cancer, or progressive, degenerative neurologic disease (e.g., Parkinson's Disease, multiple sclerosis, ALS) * Abnormal laboratory markers (e.g., renal or liver abnormalities, elevated potassium levels, or hemoglobin and hematocrit below the lower limit of normal) as determined by study physician. * Significant cognitive impairment, defined as a scores below the cutoff for dementia on TICS-M * Severe rheumatologic or orthopedic diseases (e.g., awaiting joint replacement, active inflammatory disease); * Terminal illness with life expectancy less than 12 months, as determined by a physician; * Other significant co-morbid disease (e.g. renal failure on hemodialysis) or severe psychiatric disorder (e.g. bi…