Intact Cognitive Function

The goal of this clinical study is to learn if an artificial intelligence (AI)-assisted lifestyle intervention program can help protect memory and thinking skills in adults aged 40 years and older who do not have severe cognitive impairment. It will also learn whether the program can help people maintain healthier lifestyle habits and whether it affects blood markers related to Alzheimer's disease. The main questions it aims to answer are: Can the AI-assisted program help participants improve their lifestyle, including diet, exercise, mental activities, social participation, sleep, smoking, alcohol use, and stress? Does a healthier lifestyle help maintain memory and thinking skills over 1 year? Are healthier lifestyle habits related to changes in blood markers such as p-tau217, which may be related to Alzheimer's disease? Does the effect differ for people who carry the APOE ε4 gene, a gene that may increase the risk of Alzheimer's disease? Researchers will compare participants with healthier lifestyles to those with less healthy lifestyles, to see whether healthier lifestyles are linked to better memory and thinking and different blood marker levels. Participants will: Join an online lifestyle intervention program for 1 year. Receive personalized advice about diet, exercise, mental activities, and social participation through an online platform, WeChat tools, an AI assistant, and online messages. Complete memory and thinking tests and lifestyle questionnaires at the start of the study, at 6 months, and at 12 months. Give blood samples at the start of the study and at 12 months for tests related to Alzheimer's disease. Have APOE gene testing at the start of the study.