patients with stones had better not eat spinach. According to the analysis, the most important component of urinary calculi is calcium oxalate. About 87.5% of patients with urinary calculi in China are calcium oxalate. In normal times, a normal adult excretes 12 ~ 4 mg of oxalate from urine every day. Some of these oxalates come from food. If there is too much oxalate in food and the calcium oxalate in urine is supersaturated, the excess calcium oxalate crystals may precipitate from urine and form stones. Among foods, spinach has the highest oxalate content, and spinach is one of the vegetables that people often eat. So how does eating spinach change the amount of oxalic acid excreted in urine? Researchers have experimented with 1 healthy people, letting them eat boiled and fried spinach respectively, and then measuring their urine. Results After eating 2 grams of spinach, the excretion of oxalic acid in urine increased obviously, especially reaching the peak at 2-4 hours after eating, and still higher than the pre-test level after 8 hours, which was 2-25 mg higher than that of those who did not eat spinach, which was close to the average amount of oxalic acid in urine for 24 hours. The experiment also found that the excretion of oxalic acid in the urine of those who ate fried spinach was higher than that of those who ate scalded spinach.

It can be seen that patients with urinary calculi should not eat spinach any more, because the calcium oxalate in their urine is already supersaturated, and if they eat it again, it may aggravate their condition. If patients with urinary calculi have removed stones through surgery, avoiding eating spinach can prevent recurrence. When healthy people eat spinach, drinking more water can dilute urine and reduce urine oxalic acid concentration; It is beneficial to use scalding food method to prevent stones.