At What Age is Malnutrition Irreversible?
                                
                                
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                                    6 min read                                
                            
                                The World Health Organization (WHO) identifies the '1000-day window'—from conception to a child's second birthday—as a critical period where malnutrition is particularly dangerous, with consequences often becoming irreversible after this time. The permanent damage from chronic undernutrition during these early years can affect physical and cognitive development for life.