If you're like many people, you can't start the day without it.
Research shows coffee is safe for most people.
Others have to be more careful. If you have heart rhythm disturbances or heart disease, you may be more vulnerable to coffee's stimulant effects. If you're pregnant, ask your doctor about coffee, although most studies show it's safe for the mother and her unborn baby. If coffee makes you jittery or gives you headaches, you may want to go easy on it. Quitting coffee too quickly can give you a headache or other symptoms, so cut back slowly.