Some food combinations may do harm ( part 1 )

Foods, if not combined in a scientific way, may lose nutritional value or even do harm, herbalist Bang Cam says...
Part 1: Be careful with some roots
   Potatoes and beef need different density of gastric juices for digestion. Potatoes are more easily digested while beef is quite the opposite, so beef stays longer in the stomach for digestion and absorption. It will cause disorder in the stomach if it happens over a long time.

    Similarly, onions should not be cooked with soybean curd or tofu. The calcium in the tofu and the oxalic acid in the onions will produce a white substance that makes it difficult for the body to absorb the calcium.
   It is not advisable to cook white radishes and carrots together in a dish. The white radish has a high content of vitamin C while the carrot contains the enzyme that destroys the vitamin C in the white radish. Also, the carrot can do the same harm to other vegetables containing vitamin C.

To be continous ...
=> Next part: Eggs !