Does Our Saliva Have Calories? Unpacking the Science of Spit
                                
                                
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                                    4 min read                                
                            
                                Composed of approximately 99.5% water, human saliva serves many vital functions, from aiding digestion to protecting teeth. This often-overlooked bodily fluid is a complex mixture, prompting the common question: does our saliva have calories? The simple, but surprising, answer is no.