The 30-day sugar- reduction campaign challenge was established in the LINE APP, for FB fans as the object, in FB publicity, scan QR code to join, a daily photo of sugar reduction could get 1 point, set 30 points to complete the challenge. During the activity, sugar-reduction music videos were broadcast on FB to explain how to reduce sugar and its benefits. Participants completed questionnaires before and after the event, including frequency of sweetened beverages, body weight, and knowledge.