Written by functional medicine expert Dr. Navaz Habib, this book offers an approachable overview of recent research, easy-to-implement strategies, and more. Learn how to: understand the impact of psychological and physical stressors; explore the intricate functioning of the Vagus Nerve and its connection to the parasympathetic nervous system and the microbiome-gut-brain axis; measure Vagus Nerve function using heart rate variability (HRV) and other devices; employ a wide range of strategies to upgrade your HRV/VN tone, including non-invasive electrical stimulation, breathwork techniques, nutritional optimisation, 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.