Do Vegetables Lose Nutrients When Old? The Science of Aging Produce
                                
                                
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                                    4 min read                                
                            
                                According to University of California studies, vegetables can lose 15% to 55% of their vitamin C content within just a week after harvest. This highlights a crucial fact: yes, vegetables do lose nutrients when old, and the degradation process begins almost immediately after they are picked from the plant.