Popcorn can be healthy, depending on how it's prepared. Dry popped kernels made with hot air are generally healthy as long as oils, fats and sugars are not added.
A 2012 study from researchers at Scranton University found a single serving of popcorn has as many antioxidants as all the fruits and vegetables most people eat in one day. Popcorn also contains large amounts of vitamins and minerals including iron, zinc, vitamin A, vitamin E and vitamin K. Whole grain kernels tend to have more health benefits than their counterparts. Health-conscious eaters should avoid microwavable popcorn, because it often includes chemicals and other additives that can make the snack less healthy.