Is it safe to eat walnut shells? The definitive guide.
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                The hard, woody shells of walnuts are composed of indigestible compounds like cellulose and lignin. While the nut itself is a healthy snack, the answer to 'is it safe to eat walnut shells?' is a resounding no, due to serious potential health risks.