According to the Act II website, one serving of Butter Lovers popcorn, about 4.5 cups, has 120 calories. Forty of those calories are from fat. One bag yields about 2.5 servings.
In regards to other nutritional concerns, a serving of the popcorn has 19 grams of carbohydrates, 3 grams of protein and 2 grams of dietary fiber. A serving has 250 milligrams of sodium, which is about 10 percent of the recommended daily value of sodium. A single serving has 4 percent of the recommended daily value for iron, but no significant amounts of any vitamins or other minerals. In addition, the popcorn has no cholesterol.