There are five main categories of foods that need to be avoided by stone patients: the first category is foods rich in oxalic acid, such as kale, almonds, peanuts, beets, spinach, rhubarb, black tea and cocoa powder, among which spinach has the highest content of oxalic acid and needs to be avoided the most. The second category is the need to limit sodium intake, because a diet high in salt increases urinary calcium excretion, so the daily intake of salt in food should be limited. The third category is to limit the excessive intake of protein. Normal protein intake in a normal diet will not affect the formation of stones, but excessive intake will induce the formation of calcium-containing stones. The fourth food group is to reduce the intake of vitamin C. A large amount of vitamin C can be converted into oxalic acid, so the daily intake of vitamin C should not exceed 1 gram. The fifth category is to limit the intake of high purine diet, including animal offal, poultry skin, sardines, anchovies and other seafood, beer is also rich in purine, so it is also necessary to reduce intake.