Can I eat all the popcorn I want? A look at portions and preparations
                                
                                
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                                    4 min read                                
                            
                                According to the USDA, a single cup of air-popped, unbuttered popcorn contains just over 30 calories. However, this low-calorie count does not mean you can eat all the popcorn you want without consequence, as preparation method and portion size are crucial for a healthy snack.