Caffeine: Does It Get You Going?
Caffeine provides the kick that some people need to get going. It is a mild stimulant that can increase wakefulness and feelings of energy but its effects on health are less clear, despite many years of research.
For most healthy adults, moderate amounts of caffeine, 200 to 300 milligrams a day, or about two to three cups of coffee, pose no physical problems.
If you are