Why Were People Deficient in Iodine? The Historical and Geographic Reasons
                                
                                
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                                    5 min read                                
                            
                                According to the World Health Organization, over two billion individuals globally had insufficient iodine intake in 2007, highlighting a once-widespread public health crisis. Historically, the reason people were deficient in iodine was a combination of geographical limitations and dietary patterns, which had profound effects on human development and health.