Irisin, secret hormone of the human body that is produced during exercise, the scientists from the United States. The active substance was found several years ago in the framework of experiments with laboratory mice. The researchers found that exposing animals to physical activity, in their body formed of a substance that accelerates the process of weight loss.
In a similar study conducted and American experts. They proved, irisin contained in the human body. It performs similar functions.
While scientists can't determine in which body hormone. This question will be the topic for further research and experimentation.