Harness the power of vagus nerve (VN) function and heart rate variability (HRV) in the long-awaited follow-up to bestseller Activate Your Vagus Nerve by Dr. Navaz Habib. This book goes beyond activation alone to explore stressors, measurement techniques, and practical protocols to create a roadmap to a healthier, happier life. This book offers an approachable overview of recent research, easy-to-implement strategies, and more. With Upgrade Your Vagus Nerve, you'll learn how to: ? Understand the impact of psychological and physical stressors, such as traumatic incidents and nutritional deficiencies ? Explore the intricate functioning of the vagus nerve and its connection to the parasympathetic nervous system and the microbiome-gut-brain axis ? Learn how to measure vagus nerve function using heart rate variability (HRV) and other devices ? Discover a wide range of strategies to upgrade your HRV/VN tone, including non-invasive electrical stimulation, breathwork techniques, nutritional optimization, sound therapy, temperature exposure, circadian biology alignment, and more Find balance, become resilient, and embark on a journey toward improved well-being with the help of the vagus nerve.