Vata governs movement, Pitta governs transformation and heat, and Kapha governs structure and stability. Everyone has all three, in a personal proportion fixed at birth (prakriti).
Health, in Ayurveda, is the doshas staying close to that natural balance. Diet, season, age, routine and stress can push one or more out of balance, and much of Ayurvedic advice is about gently bringing them back.
