2. Because white radish is rich in vitamin C, carrot contains a decomposing enzyme called ascorbic acid. If white radish and carrot are put together, the decomposing enzyme in carrot will destroy vitamin C in white radish, which will seriously affect the nutritional value of white radish. So white radish and carrot can't be eaten together. There are also gourds, pumpkins and so on. There are also decomposition enzymes similar to carrots.