The Science Behind Why do you feel so good after a fast?
                                
                                
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                                    5 min read                                
                            
                                The human brain consumes over 20% of the body's daily energy, despite making up only 2% of the body's weight, and its fuel source greatly impacts its function. This metabolic flexibility is at the heart of **why do you feel so good after a fast?**, triggering a cascade of beneficial physiological and neurological effects.