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People who regularly take in a lot of caffeine soon develop less sensitivity to it.

The Buzz on Caffeine

This means they may need more caffeine to achieve the same effects. Caffeine is a mild diuretic, meaning it causes a person to urinate pee more.

Side Effects & Safety

Caffeine also may cause the body to lose calcium, and that can lead to bone loss over time. Drinking caffeine-containing soft drinks and coffee instead of milk can have an even greater impact on bone density and the risk of developing osteoporosis. Caffeine can aggravate certain heart problems. It also may interact with some medicines or supplements.

If you are stressed or anxious, caffeine can make these feelings worse. Although caffeine is sometimes used to treat migraine headaches, it can make headaches worse for some people. Caffeine is usually thought to be safe in moderate amounts. Experts consider — mg of caffeine a day to be a moderate amount for adults. But consuming as little as mg of caffeine a day can lead a person to become "dependent" on caffeine. This means that someone may develop withdrawal symptoms like tiredness, irritability, and headaches if he or she quits caffeine suddenly.

Teens should try to limit caffeine consumption to no more than mg of caffeine daily, and kids should get even less.

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The following chart includes common caffeinated products and the amounts of caffeine they contain:. Source: U.

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If you're taking in too much caffeine, you may want to cut back. The best way is to cut back slowly. Otherwise, you could get headaches and feel tired, irritable, or just plain lousy. Try cutting your intake by replacing caffeinated sodas and coffee with noncaffeinated drinks, like water, decaffeinated coffee, caffeine-free sodas, and caffeine-free teas. Start by keeping track of how many caffeinated drinks you have each day, then substitute one of these daily drinks with a caffeine-free alternative.

Continue this for a week. Then, if you are still drinking too much caffeine, substitute another of your daily drinks, again, keeping it up for a week. Do this for as many weeks as it takes to bring your daily caffeine intake below the milligram mark. Taking a gradual approach like this can help you wean yourself from caffeine without unwanted side effects like headaches.

The effects of caffeine on health have been widely studied—in particular, its effects on fibrocystic breast disease, conditions of the heart and blood vessels, birth defects, reproductive function, and behavior in children. The American Medical Association Council on Scientific Affairs concludes, "Moderate tea or coffee drinkers probably have no concern for their health relative to their caffeine consumption provided other lifestyle habits diet , alcohol consumption are moderate as well.

Since caffeine affects different people in different ways, the definition of "overuse" can vary. Caffeine is defined as a drug because it is a central nervous system stimulant. Since caffeine-related disorder is not recognized as a diagnosable condition, there is no standardized treatment. It is generally recommended that children avoid caffeine use.

Caffeinated beverages may be replacing nutrient-dense foods such as milk, and their consumption may interfere with the absorption of certain nutrients such as calcium and iron. A child may also eat less after drinking caffeine because it acts as an appetite suppressant. Pregnant women and people with coronary heart disease or peptic ulcers may be advised by their health care provider to restrict or avoid using caffeine. Many drugs interact with caffeine.

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