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Summary

What is caffeine?

Caffeine is a bitter substance that occurs naturally in more than than 60 plants including:

• Java beans
• Tea leaves
• Kola nuts, which are used to flavour soft drink colas
• Cacao pods, which are used to brand chocolate products

There is also constructed (human being-made) caffeine, which is added to some medicines, foods, and drinks. For example, some pain relievers, common cold medicines, and over-the-counter medicines for alacrity incorporate synthetic caffeine. And then do energy drinks and "energy-boosting" gums and snacks.

Most people swallow caffeine from drinks. The amount of caffeine in different drinks tin can vary a lot, but it is generally:

• An viii-ounce cup of coffee: 95-200 mg
• A 12-ounce can of cola: 35-45 mg
• An 8-ounce energy potable: lxx-100 mg
• An 8-ounce loving cup of tea: 14-60 mg

What are caffeine's furnishings on the body?

Caffeine has many effects on your body's metabolism. It:

• Stimulates your central nervous arrangement, which can make y'all feel more awake and requite y'all a boost of energy
• Is a diuretic, meaning that it helps your trunk get rid of extra salt and water by urinating more than
• Increases the release of acid in your tum, sometimes leading to an upset tum or heartburn
• May interfere with the absorption of calcium in the trunk
• Increases your blood pressure

Within one hour of eating or drinking caffeine, it reaches its meridian level in your blood. You may go on to feel the effects of caffeine for four to six hours.

What are the side effects from too much caffeine?

For near people, it is non harmful to eat up to 400mg of caffeine a 24-hour interval. If you do eat or drink also much caffeine, it tin can cause wellness issues, such every bit:

• Restlessness and shakiness
• Insomnia
• Headaches
• Dizziness
• Fast middle rate
• Dehydration
• Anxiety
• Dependency, so you lot need to have more of information technology to get the same results

Some people are more sensitive to the effects of caffeine than others.

What are energy drinks, and why can they exist a problem?

Energy drinks are beverages that take added caffeine. The amount of caffeine in free energy drinks tin vary widely, and sometimes the labels on the drinks do not requite you the actual amount of caffeine in them. Energy drinks may likewise contain sugars, vitamins, herbs, and supplements.

Companies that make free energy drinks claim that the drinks can increment alertness and amend physical and mental functioning. This has helped make the drinks pop with American teens and young adults. There'south limited data showing that free energy drinks might temporarily improve alacrity and physical endurance. There is not plenty evidence to show that they enhance strength or power. But what we exercise know is that energy drinks can exist unsafe considering they have big amounts of caffeine. And since they have lots of saccharide, they tin can contribute to weight gain and worsen diabetes.

Sometimes young people mix their free energy drinks with alcohol. It is unsafe to combine booze and caffeine. Caffeine can interfere with your power to recognize how drunk you are, which tin can lead you to drink more. This also makes you more probable to make bad decisions.

Who should avoid or limit caffeine?

You lot should check with your health intendance provider about whether you should limit or avoid caffeine if you lot:

• Are pregnant, since caffeine passes through the placenta to your baby.
• Are breastfeeding, since a small-scale amount of caffeine that you swallow is passed along to your baby.
• Have sleep disorders, including insomnia.
• Accept migraines or other chronic headaches.
• Have anxiety.
• Accept GERD or ulcers.
• Have arrhythmia (a problem with the charge per unit or rhythm of your heartbeat).
• Take high blood pressure.
• Have certain medicines or supplements, including stimulants, certain antibiotics, asthma medicines, and heart medicines. Check with your health care provider about whether at that place might exist interactions between caffeine and any medicines and supplements that yous accept.
• Are a child or teen. Neither should have as much caffeine as adults. Children can be especially sensitive to the effects of caffeine.

What is caffeine withdrawal?

If you accept been consuming caffeine on a regular ground and then of a sudden stop, you may have caffeine withdrawal. Symptoms can include:

• Headaches
• Drowsiness
• Irritability
• Nausea
• Trouble concentrating

These symptoms usually go away later on a couple of days.

• Benefits of Coffee (Academy of Nutrition and Dietetics)
• Caffeine and Alcohol (Centers for Disease Control and Prevention)
• Caffeine and Migraine (American Migraine Foundation)
• Caffeine: How Does It Affect Blood Pressure? (Mayo Foundation for Medical Education and Research) Also in Spanish
• Does Caffeine Help with Weight Loss? (Mayo Foundation for Medical Education and Inquiry) Also in Castilian
• Truth Nearly Energy Drinks (American University of Family Physicians) Also in Spanish

• ClinicalTrials.gov: Caffeine (National Institutes of Health)

• Caffeine (For Parents) (Nemours Foundation) Also in Castilian

• Caffeine (Nemours Foundation) Also in Spanish

• Caffeine in Pregnancy (March of Dimes Birth Defects Foundation) Likewise in Spanish

• Caffeine in the diet (Medical Encyclopedia) Besides in Spanish
• Caffeine overdose (Medical Encyclopedia) Too in Spanish

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Source: https://medlineplus.gov/caffeine.html

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