Spinach must be boiled in water first, because spinach contains oxalic acid, which can prevent the absorption of the cover, but oxalic acid is soluble in water, so boiled spinach can be stewed with bones.
The so-called "broken food", also called "eating together", usually means that people often have some established habits to eat in their daily lives. Although it has not brought obvious harm to their health, some unscientific food collocation, or affecting the absorption of food nutrients, or leaving invisible hidden dangers to the human body, all belong to this category.