Have you ever felt butterflies before a big meeting or been more bloated and lethargic during times of stress? You’ve witnessed the gut–brain axis at work. The stomach and nervous system are in an ongoing dialogue, and this communication affects mood, energy, focus, immunity, and the quality of sleep. The great news: small, daily choices—what you eat, how you breathe and move, when you eat—have the potential to fine-tune this dialogue to your advantage.