A 36-hour fast—going without food but allowing water and coffee—is believed by some to trigger a full body “reset.” Advocates say the body starts burning fat after 12 hours, entering ketosis, a metabolic state that promotes fat loss. Some also claim benefits like improved heart health, sharper focus, and cellular repair through autophagy, a process that recycles damaged cells. However, experts caution that much of this evidence comes from animal studies, not humans. Researchers like Professor James Betts of the University of Bath warn that proven long-term benefits remain uncertain, and results may vary widely between individuals. While fasting can promote weight loss, it can also lead to muscle loss or nutrient deficiencies if done incorrectly. Nutrition experts advise that such intense fasting isn’t suitable for everyone—especially those with underlying health conditions. Ultimately, while the idea of a “complete reset” is appealing, scientists stress that fasting should be approached with care and only under medical supervision. Consulting a doctor remains the safest first step before attempting a 36-hour fast.
