Today, Americans eat 54 quarts of popcorn per person per year. And while movies and popcorn seem to go together, theaters are not the largest users of popcorn. About 70 percent is purchased by consumers at retail stores in raw or popped form and eaten at home.
How healthy is all this popcorn? Like most foods, it depends on what you put on it and what you eat with it. Plain popcorn is a nutritious, low-calorie snack. However, drenched with butter or margarine and doused with salt, popcorn begins to fall out of favor with nutritionists and dietitians. Add sugary syrups and you have a snack that promotes cavities.
Prepared via the air-pop method in a microwave oven or with an inexpensive air-pop machine, a cup of plain popcorn contains fewer than 30 calories and is virtually fat and sodium free. It's also a good source of fiber (about 2 grams per cup), which adds bulk and thereby makes this nonfattening food quite filling.
Every tablespoon of oil used for popping adds around 100 calories, as does every tablespoon of melted butter added after popping. More than two-thirds of the popcorn sold today comes already buttered and salted and ready to microwave-pop in two to three minutes. Calories for microwave popcorn vary from 40 per cup for "light" varieties to 60 or 70 per cup for "regular" versions. Sodium levels also vary highly, from 50 to 150 milligrams per cup.
If you're interested in controlling the fat and salt in your popcorn, start with plain kernels and an air-pop machine. The two main types of popcorn, yellow pearl and white rice, pop differently. Yellow pearl kernels produce a greater volume of popcorn per kernel than do white rice ones. On the other hand, white rice popcorn does not produce any hulls to get stuck in your teeth.
How well your popcorn pops depends mostly on the moisture content of the popcorn and the temperature of the popper. The ideal popping temperature is between 400 degrees and 460 degrees F. A moisture content of 13.5 percent to 14 percent seems to work best when popping corn with oil in an electric popper. A slightly higher moisture content may be helpful for dry popping in an air-popper.
Popcorn that has been processed by a reliable processor and packed in an airtight, undamaged container or package should be at the proper moisture level for perfect popping. Once the package is opened, the unused portion should be stored in an airtight container such as a glass jar to help preserve the natural moisture. Left uncovered on a hot day, the moisture content of the kernels can drop as much as 1 percent. Although that may not sound like a lot, a loss of 3 percent can render the popcorn unpoppable. It is generally recommended that popcorn be stored in a cool, dry cupboard. However, in Colorado's dry climate, some people report better keeping quality when popcorn is stored in the refrigerator.
If your popcorn doesn't pop into fluffy, crisp kernels, its moisture content has probably dropped too low. To recondition the kernels, fill a quart jar three-fourths full with dry popcorn kernels and add 1 tablespoon of water. Cover and shake frequently, every five or 10 minutes, until all of the water has been absorbed. After two to four days of storage in the closed jar, the corn should again be ready for perfect popping.
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