Tracks daily diet and calculates nutrition information to help achieve weight loss goals. Use when user provides meal information, asks about calorie intake, requests remaining calorie budget, or needs meal logging reminders. Automatically reminds user to log meals via cron job at lunch and dinner times.

追踪每日饮食并计算营养信息，以帮助实现减重目标。当用户提供餐食信息、询问热量摄入、请求剩余热量配额或需要餐食记录提醒时使用。通过定时任务在午餐和晚餐时间自动提醒用户记录餐食。