Your body is still bracing for a lion that isn't there.

Why Zebras Don't Get Ulcers is the science behind why your body keeps reacting to threats that aren't actually there. Stanford neuroscientist Robert Sapolsky spent decades studying stress physiology, and his conclusion is as simple as it is unsettling — the human stress response was built for a lion chase, not a lingering inbox. We activate the same fight-or-flight system for a bad email that a zebra uses to outrun a predator, except the zebra's system knows how to shut off. Ours often doesn't. That gap is where chronic pain, fatigue, and inflammation quietly take root.

This isn't a self-help book with five easy steps — it's a deep, research-backed look at what happens when stress becomes a way of life instead of a passing state. And for anyone in recovery, that distinction changes everything. Healing isn't only about the tissue. It's about teaching the nervous system it's safe to stand down.