Like other drugs, it is possible to become dependent on caffeine, and going without it can lead to symptoms of withdrawal. These symptoms may resolve when a person consumes caffeine again. If a person is determined to stop, withdrawal symptoms often pass within a few days. When a person who regularly consumed high amounts of caffeine stops suddenly, they may experience more severe withdrawal symptoms.
Rather than quitting abruptly, it may be better to gradually reduce caffeine intake until it can be eliminated without symptoms. The effects of caffeine typically last for a few hours, unless someone has consumed a high amount or is especially sensitive to the drug. Caffeine lingers in the body and may disrupt sleep patterns, even after noticeable effects have worn off. While it is generally considered safe to consume caffeine while breast-feeding, it may be a good idea to cut off consumption 1—2 hours before a feed.
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Medically reviewed by Natalie Olsen, R. Metabolism Caffeine sources Quantities Breast-feeding Sleep Side effects Withdrawal symptoms Takeaway Caffeine is a familiar drug that stimulates the nervous system. How long does it take to metabolize caffeine? Share on Pinterest Caffeine may have a greater effect on people who are sensitive to it.
Foods and drinks that contain caffeine. It is nearly impossible to measure caffeine powder accurately in the home. As a result the risk of an accidental, lethal overdose is high. Caffeine has both positive and negative attributes. It can be very effective for improving your concentration, alertness and energy. But these effects can be brief if you consume high doses of caffeine on a daily basis.
Caffeine also can have a negative effect on your sleep. It can reduce the quantity and quality of your sleep. These effects can occur even when you are unaware of them. Like most substances, you should use caffeine in moderation. These are some general guidelines for you to follow:. Caffeine levels vary widely from one product to another. In particular, the caffeine content of coffee can be very unpredictable. Scientists at the University of Florida bought a oz cup of the same type of coffee from one coffee shop for six straight days.
They analyzed each cup of coffee to determine how much caffeine it contained. They found a wide range of caffeine levels in the six cups of coffee. The lowest level was mg of caffeine and the highest was mg. These include the type of bean that is used and how the coffee is prepared. In the same way, the size of a tea bag, number of tea leaves and brewing time can affect the caffeine level of a cup of tea.
Caffeine is added to many soft drinks. The U. This means that caffeine is not regulated by the FDA as a food additive. But the label does not need to show the amount of caffeine in the drink. The following table will help you compare the caffeine levels found in a number of common products:. Previous Next. View Larger Image. These effects depend on the amount of caffeine you consume and when you consume it: Positive Effects of Caffeine Caffeine is considered a moderately effective alerting agent.
Negative Effects of Caffeine Caffeine can have a disruptive effect on your sleep. At high doses, caffeine can produce these common side effects: Diarrhea Sweating Nausea Increased heart rate Increased breathing rate Muscle tremors Withdrawal symptoms can occur when you stop taking caffeine after using it regularly for a long time. Caffeine Summary Caffeine has both positive and negative attributes. S 7. Clark, I. Coffee, caffeine, and sleep: A systematic review of epidemiological studies and randomized controlled trials.
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