Is it normal to feel tired when you haven't eaten? Understanding the 'Hangry' Crash
                                
                                
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                                    4 min read                                
                            
                                According to numerous health experts, a temporary dip in blood sugar levels is a common physiological response to not eating for an extended period, which can cause fatigue. So, to answer the question, yes, it is normal to feel tired when you haven't eaten.