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Research shows a 72-hour fast can completely rebuild your immune system. A study from the University of Southern California has revealed that fasting for 72 hours can trigger a complete regeneration of the immune system. Researchers found that prolonged fasting causes the body to deplete its glucose and fat reserves, forcing it into a detoxifying state that eliminates damaged cells and toxins. When normal eating resumes, stem cells are activated, leading to the production of fresh, healthy white