People usually limit the intake of food, but keep the intake of non-alcoholic beverages such as drinking water and tea. Four days may be relatively short for breaking the grain, because the time for breaking the grain can range from several days to several weeks. However, if you choose to limit your food intake for four days, it can still be regarded as a form of breaking the valley.
It should be noted that crossing the valley is not a health care method suitable for everyone, because restricting eating for a long time may have a negative impact on health. If you want to try to go to the valley, it is recommended to consult a doctor or professional health expert first, and then make a decision according to your physical condition and needs.