What substances in rice flour and rolling pin are harmful to human health?

Most of them contain preservatives and trace elements that are not conducive to human health. Even instant noodles marked "non-fried" should not be eaten. There are so many nutritious and delicious things, why do you have to eat instant noodles? Eat more fish and drink some fish soup! If rice noodles are made of pure rice, you can certainly eat them, but now rice noodles made in some places contain gum that is harmful to human body. In order to make the taste stronger, you must be careful!