Popcorn can either be good or bad for a personâs health depending on what goes into making it. On its own without any added sugar or salt popcorn makes a nutritious healthful snack. Popcorn is a type of corn kernel that when people heat it it pops to become light and fluffy. Popcorn contains plenty of nutrients and vitamins when people make it in the right way. However many popcorn brands in supermarkets and movie theaters contain lots of added butter sugar and salt. These additions can be bad for a personâs health.