Preserved egg: When manufacturer preserved eggs, often increases the lead, if we eat frequently, can cause lead-poisoning. At the same time, it will cause lost of calcium.

• 皮蛋：一般制造商在制作皮蛋时，常添加定量的铅，我们若经常食用，会引起铅中毒。同时，还会造成身体内钙质的流失。