How many calories does licking an envelope have?
                                
                                
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                                    5 min read                                
                            
                                According to the U.S. Food and Drug Administration, the adhesive on a U.S. envelope contains only around 1.7 calories per gram, which equates to about one-tenth of a single calorie per lick. The seemingly odd question of how many calories does licking an envelope have has a surprisingly mundane and reassuring answer for anyone worried about an accidental snack.