What Can Humans Not Digest from Plants? A Guide to Dietary Fiber
                                
                                
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                                    4 min read                                
                            
                                According to the Harvard T.H. Chan School of Public Health, humans cannot digest certain plant-derived carbohydrates, known collectively as dietary fiber. This is a key reason why parts of a plant-based meal, such as stalks and skins, pass through the body mostly intact, providing essential benefits beyond simple nutrition.