What Happens if You Eat Junk Food for a Week? The Immediate Health Impacts
                                
                                
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                                    4 min read                                
                            
                                According to a study published in *Nature Metabolism*, eating highly processed foods for just five days can reduce the brain's sensitivity to insulin. This is a key example of what happens if you eat junk food for a week, with noticeable impacts occurring surprisingly quickly, affecting more than just your waistline.