Toon, also known as toon head, toon buds, raw toon contains nitrate and nitrite components, these two substances have a certain degree of toxicity to the body. And because of the raw toon directly eat taste more astringent, therefore, daily life is usually not suitable for eating raw, it is recommended to be cooked and then eat. Eat cooked parsnips need to pay attention to the amount of intake, should not be consumed too much at once, so as not to lead to food poisoning, affecting the health of the body.