How does meditation work to relieve stress?

Relaxation: While the precise mechanism is not well-understood, meditation seems to relax the body by reducing the metabolic activity of the body and the brain while still maintaining a state of wakefulness. Meditation also depresses the sympathetic nervous system involved in the "fight or flight" response, and may have long-term effects on the brain, improving cognitive function and emotional stability.

Works at Endocrines: Meditation depending on the types works at 7 different levels and stimulates the endocrines - for example1. First chakra stimulates - adrenals, 2. Second chakra - reproductive organs gonads, kidneys, 3. Third chakra -pancreas 4. Fourth - thymus and heart, 5. Fifth - thyroid, parathyroid, 6. Sixth - pituitary, 7. Seventh - pineal glands so depends on meditation you choose. Pineal blue pearl-my fav.