Special note: pickles can only be eaten occasionally, if long-term gluttony, it may cause urinary stones. In addition, pickled sauerkraut process, vitamin C is a large number of destruction, the human body if the lack of vitamin C, will make the inhibition of intrarenal calcium oxalate crystals deposited and reduce the ability to reduce the formation of stones. Consumption of sauerkraut containing too much nitrite will make the blood protein into the loss of oxygen-carrying function of methemoglobin, so that the red blood cells to lose the ability to carry oxygen function, resulting in tissue hypoxia, skin and lip bruising, headache and dizziness, nausea and vomiting, panic and other symptoms of toxicity, the serious can also be fatal. Moldy sauerkraut is obviously carcinogenic and should not be consumed.