Oxidized lotus root slices, i.e. lotus root slices turning black, are usually edible and will not affect the human body. Lotus root slices usually turn black after oxidation, because the lotus root is not cooked in time after cutting and eating, the phenolic substances in it are oxidized and turn black after contacting with the air. Oxidized blackening does not breed harmful substances that are not good for the human body, but only affects the taste of food, loss of nutritional value, will not cause harm to the human body, this oxidized blackened lotus root slices can continue to be eaten; it is best to cut off the oxidized blackened part. It is not recommended to continue to consume sliced lotus root when it turns black due to mold, as it may affect human health after consumption. Therefore, it is recommended that lotus root slices should be consumed in a timely manner to avoid oxidized blackened lotus root slices and the loss of its nutritional value.