The method is to start with cooked food and gradually change it to medium, medium, medium and raw. The transition time is customized according to the individual's stomach.

As for the early cooking method of beef: boil water, put a very small amount of salt and never put oil. Be sure to drink beef soup. If you eat it, it is about half a catty at a time. You can eat more in the early stage, but you will reduce the amount when you start eating raw beef in the later stage. Be sure to remember.

This method is suitable for China people's system. I saw it in a professional fitness textbook.