AI-Assisted Dietary Intervention for Weight Maintenance

Participants will receive balanced dietary guidance informed by the Weight Management Manual (developed in line with the Dietary Guidelines for Chinese Residents) along with biweekly consultations with a nutritionist, with an emphasis on weight management education.

"This intervention combines Artificial Intelligence-assisted Time-Restricted Eating (10-hour eating window) with Evening Caloric Restriction (\<20% of total daily energy intake at dinner). The recommended daily energy distribution is 40% for breakfast, 40% for lunch, and 20% for dinner. Al support will be provided via the Weight Manager app, which sends meal reminders ahead of each meal. Participants will log each meal by the app. If no log is recorded for seven consecutive days, the weight management AI will notify a study dietitian to contact the participant for follow-up and provide dietary counseling. Educational infographics and articles on the benefits of restricting the eating window and reducing dinner caloric intake will be pushed once a month via the Weight Manager app or WeChat. Dietary records collected during follow-up visits will be reviewed to reinforce education on lowering the proportion of daily energy consumed at dinner."