Caffeine ingestion may cause side effects such as tremor, nausea, irritability, anxiety, or gastrointestinal problems [29]; particularly, it is not recommended for young athletes due to those adverse effects on health [4] , in some cases such as Ramadan, it is not preferred also due to different reasons [34].
Human response to coffee or caffeine can also vary substantially across individuals. Low to moderate doses of caffeine (50–300 mg) may cause increased alertness, energy, and ability to concentrate, while higher doses may have negative effects such as anxiety, restlessness, insomnia, and increased heart rate.
Regular use of more than 600 mg of caffeine might cause the short-term effects listed above. Long-term effects at this level may include chronic insomnia, constant anxiety, depression, and stomach problems. It can also cause high blood pressure or make high blood pressure worse.
“For most people, moderate coffee consumption can be incorporated into a healthy diet.” Hu said that moderate coffee intake—about 2–5 cups a day—is linked to a lower likelihood of type 2 diabetes, heart disease, liver and endometrial cancers, Parkinson's disease, and depression.
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In this battle over health benefits, coffee comes out on top. Coffee drinkers can raise a mug to fiber, microbiome health and lowering risk for cancer and diabetes. But tea drinkers, do not despair. Tea is undoubtedly good for your blood pressure, cholesterol, stress levels, mental health and productivity.
Caffeine is a stimulant, which means it increases activity in your brain and nervous system. It also increases the circulation of chemicals such as cortisol and adrenaline in the body. In small doses, caffeine can make you feel refreshed and focused.
Caffeine can cause insomnia, nervousness, restlessness, nausea, increased heart rate, and other side effects. Larger doses might cause headache, anxiety, and chest pain. Caffeine is likely unsafe when used in very high doses. It can cause irregular heartbeat and even death.
Healthy adults shouldn't consume more than 400 milligrams (mg) of caffeine per day. That's equal to about four 8-ounce cups of brewed coffee or 10 cans of cola. Teens should limit their caffeine intake to less than 100 mg per day (one 8-ounce cup of coffee or about two cans of cola).
Studies have found caffeine can do both good and harm. People who regularly drink coffee may be less likely to develop chronic illnesses, such as cardiovascular disease, diabetes, Parkinson's disease and some cancers. A few studies suggest they are less likely to die from heart disease and other illnesses.
Not partaking in caffeine can be good for your blood pressure. Caffeine has been shown to raise blood pressure levels due to the stimulatory effect it has on the nervous system. High intake of caffeine — 3 to 5 cups per day — has also been associated with increased risk of cardiovascular disease.
Drinking coffee often leads to a spike in the blood pressure, which may not last a long time. Still, such a dramatic increase is not good for those who already deal with the issues related to high blood pressure. For them particularly, drinking lots of coffee can be pretty serious.
Avoid caffeine after 3 p.m.
Some health experts recommend people stop drinking coffee as early as 2 p.m. If it's the later afternoon or evening and you still need a caffeine boost, try having one cup of black tea, which has half the amount of caffeine of coffee, or green tea, which has around one third the amount.
Studies also show that coffee has protective effects on the kidneys, thanks to antioxidants. Drinking coffee is associated with a lower risk of developing chronic kidney disease (CKD).
Drinking coffee on an empty stomach is unlikely to cause any damage to your stomach, but it could theoretically provoke heartburn, Dr. Barrett said.
As a general rule, you can assume that an average 8-ounce (240-ml) cup of coffee offers around 100 mg of caffeine. Several sources suggest that 400 mg of caffeine per day — the equivalent of 4 cups (945 ml) of coffee — is safe for most healthy adults ( 3 , 5 ).
Overall, caffeine is not likely to damage your kidneys as long as it is consumed in small doses. It is important to note that caffeine is a stimulant, which can affect some people's blood pressure.
The level of caffeine in your blood peaks about one hour later and stays at this level for several hours for most people. Six hours after caffeine is consumed, half of it is still in your body. It can take up to 10 hours to completely clear caffeine from your bloodstream.
For healthy adults, the FDA has cited 400 milligrams a day—that's about four or five cups of coffee—as an amount not generally associated with dangerous, negative effects. However, there is wide variation in both how sensitive people are to the effects of caffeine and how fast they metabolize it (break it down).
Wenk, Ph. D., coffee does not raise IQ levels. The caffeine in coffee only increases the brain's processing speed but it doesn't lead to significant long-term changes in cognitive performance.
Caffeine (pronounced: ka-FEEN) is a drug because it stimulates the central nervous system, causing increased alertness. Caffeine gives most people a temporary energy boost and improves mood. Caffeine is in tea, coffee, chocolate, many soft drinks, and pain relievers and other over-the-counter medicines and supplements.
According to the FDA, the half-life of caffeine is between four and six hours.
The healthiest way to take your coffee is hot-brewed and black. One cup has virtually no calories or carbs, no fat, and is low in sodium. Black coffee also has micronutrients, including potassium, magnesium, and niacin.
The caffeine in coffee gives it diuretic effects, meaning it causes your body to pass more urine. But these effects are too mild to cause dehydration, especially if you're a regular coffee drinker. Coffee may even be hydrating for some people, because it contains a lot of water.
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