1, constipation reaction: it is normal that constipation reaction occurs during the use of thin bag, which belongs to secret reaction, also called improvement reaction or dazzling reaction. Secret reaction refers to the unknown lesions and changes hidden in the body, which are manifested in the process of using traditional Chinese medicine.

2, insufficient water intake: the burning of fat in the process of losing weight needs water as a medium. If the water intake is insufficient, it will lead to constipation.