咖啡因与心脏病

Caffeine has many metabolic effects. It:

• Stimulates the central nervous system.
• Releases free fatty acids from adipose (fatty) tissue.
• Affects the kidneys, increasing urination, which can lead to dehydration.

Caffeine is in coffee, tea, some soft drinks, chocolate 和 energy drinks. Drinking coffee in moderation appears to be safe for the heart. The Food 和 Drug Administration suggests that healthy adults can drink 4 to 5 cups of coffee without harm. Some people may be more sensitive to the effects of caffeine, depending on certain health conditions 和 medications. Pregnant 和 lactating women should limit their consumption to 2 to 3 cups per day. The American Academy of Pediatrics advises that children 和 adolescents avoid caffeine 和 other stimulants.

Caffeine-habituated people can experience caffeine withdrawal within a day or so after they last consume caffeine though it usually ends within 24 to 48 hours. Caffeine withdrawal is not dangerous, but it can be unpleasant. Though a headache is the most prominent symptom, anxiety, fatigue 和 drowsiness are also common.

Check with your health care professional whether it is safe for you to consume coffee 和/or other caffeinated beverages.