Diagnosis of probable Alzheimer's disease or other dementia (e.g., vascular, Lewy body, frontotemporal)

Other neurological or medical conditions that may cause cognitive impairment

Evidence of Parkinson's disease based on motor examination

Uncontrolled hypertension (systolic BP \>170 mmHg or diastolic BP \>100 mmHg)

Allergy to walnuts

Regular consumption of more than 5 oz of walnuts per week

Current diagnosis of a major psychiatric disorder according to DSM-5 criteria

Alcoholism or substance use disorder

Any condition that, in the investigator's judgment, would make participation unsafe or interfere with study completion

Effect of Daily Walnut Consumption on Memory in Subjects With Long-COVID