Why is it bad to eat more popcorn?

Popcorn is bad for the body if you eat too much, because after cooking at high temperatures, it produces lead, a heavy metal that is bad for the body. But the content is very small, generally no problem. Popcorn because sweet and savory, often as a snack, generally no problem. My dad, however, restricts me from eating it, so I'll tell you why too.

Additionally, my parents also said that it is not good to eat ham and sausage, instant noodles and jelly, which contain preservatives, and eating too much of them affects development.