What happens to your body when you fast for 36 hours? A 36-hour fast isn’t just about skipping meals - it triggers powerful changes inside nearly every organ system. Here’s what the science shows: 🧠 Brain - Fasting increases BDNF (brain-derived neurotrophic factor), supporting focus, clarity, and even new neuron growth (Neuron, 2017). ❤️ Heart & Blood Vessels – Improves insulin sensitivity and reduces inflammation, lowering cardiovascular risk (Cell Metabolism, 2019). 🩸 Blood – Insulin drops,