Lotus root blackened whether you can still eat can not be generalized, if it is a short period of time placed in the black, generally not deterioration, can be eaten normally; if it is a long time placed in the black, resulting in deterioration and decay, can not be eaten. Lotus root contains a lot of starch, which also contains amylase, placed in the air for a period of time will be oxidized with the oxygen in the air resulting in blackening, but the oxidation product is non-toxic and harmless, will not have an impact on the body, you can rest assured that consumption. Generally, the cut lotus root can be kept refrigerated for about 7 days, and the intact lotus root for about half a month. If the lotus root is left for a long time, it may lead to deterioration and blackening due to rotting and mold, at this time, the lotus root has a certain degree of toxicity, so it can not be eaten. So the blackening of lotus root can be sustained according to the cause of the blackening to judge, but the blackening of lotus root is usually after a period of time to place, regardless of the length of time is not fresh, insurance is recommended to try to eat fresh lotus root.