1. Insulin is a hormone secreted by the pancreas, and its main function is to help glucose in the blood enter cells, reduce blood sugar level and promote the synthesis of glycogen, fat and protein.

2. Insulin promotes muscle growth while promoting fat accumulation and hindering fat burning in the body. Taking insulin more frequently will lead to weight gain.

3, insulin will also increase appetite, making it easier for people to consume too many calories. Long-term use of insulin will lead to insulin resistance, cells are insensitive to insulin and need more insulin to lower blood sugar, thus increasing the risk of diabetes or obesity.