What Vitamin Deficiency Causes Bad Memory? The Nutritional Link to Cognitive Decline
                                
                                
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                                    4 min read                                
                            
                                A deficiency in vitamin B12 can cause symptoms so similar to dementia that it is often misdiagnosed, particularly in older adults. This highlights the critical connection between micronutrient levels and brain function, with poor memory often being a key indicator of underlying nutritional shortfalls.