Which nuts contain complete protein? Only one does
                                
                                
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                                    4 min read                                
                            
                                Many people are surprised to learn that while most nuts are excellent sources of protein, they are considered 'incomplete' because they lack or are low in one or more essential amino acids. A balanced vegetarian or vegan diet requires carefully combining plant-based protein sources to ensure all nine essential amino acids are consumed. Pistachios, however, stand out as the rare exception among commonly consumed nuts, containing all nine essential amino acids in adequate amounts to be considered a complete protein source for people over five years old.