You can track down customers who lose weight by recording customer data and keeping in touch with them.

1. Record customer data: record key indicators such as customer's weight and waist circumference every day for follow-up evaluation. You can use spreadsheets, health management software or professional weight loss tracking tools to record and analyze data.

2. Keep communication with customers: keep regular communication with customers to understand the progress, difficulties and needs. You can communicate by telephone, email and online chat. , and provide active support and advice.