Can the human digestive system digest grass?
                                
                                
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                                    4 min read                                
                            
                                An intriguing biological fact is that the human digestive system is not equipped to break down cellulose, the fibrous carbohydrate that makes up the cell walls of grass. This critical enzymatic deficiency means that while a human can physically ingest grass, their digestive system cannot actually digest grass or extract any meaningful nutrients from it.