What is caffeine and what does it do?
Caffeine is a substance that is found in certain plants. It can also be produced synthetically and then added to food products. It is a central nervous system stimulant and a diuretic (substance that helps rid your body of fluids). Caffeine is absorbed and passes quickly into the brain. It does not collect in the bloodstream or get stored in the body. However, it leaves the body in the urine many hours after it has been consumed.
There is no nutritional need for caffeine and it can be avoided in the diet.
Caffeine stimulates, or excites, the brain and nervous system. It will not reduce the effects of alcohol, although many people still believe a cup of coffee will help a person “sober-up.” Caffeine may be used for the short-term relief of fatigue or drowsiness and is suggested to be the most common stimulant in our society.
Most people get their caffeine intake from coffee, which is highly acidic. Milk is also acidic, so the combination makes a very acidic environment in the body. In chemical terms, acids are molecules that contain an extra proton that can be donated, while bases can accept an additional proton. The pH scale ranges from 0 to 14; pure water has a neutral pH of 7. Acids range from 0 to 7, and bases range from 7 to 14 on the scale. The regular blood pH-range is 7.36 to 7.44, making it slightly alkaline. Deviating from this pH range puts you in an imbalance which is likely to limit the body in maintaining health, making it less resistant and can then result in disease.
Food sources containing coffeine
Caffeine is widely consumed. It is found naturally in the leaves, seeds, and fruits of more than 60 plants, including:
- Tea leaves
- Kola nuts
- Cocoa beans
It is in:
- Most colas (unless they are labeled “caffeine-free”)
Caffeine is often added to over-the-counter medications such as pain relievers, over-the-counter diet pills, and cold medicines. Caffeine has no flavor and it can be removed from a food by a chemical process called decaffeination.
Caffeine can lead to:
- A fast heart rate
- Difficulty sleeping
- Urinating more often
Stopping caffeine abruptly may cause withdrawal symptoms, such as:
Reduce caffeine gradually to prevent any symptoms of withdrawal.
The effect of caffeine on health has been widely studied.
- Large amounts of caffeine may decrease bone mass density, most likely by interfering with the body’s ability to absorb calcium. This may lead to osteoporosis.
- Caffeine may cause or worsen painful, lumpy breasts (fibrocystic disease).
Caffeine may have a negative effect on a child’s nutrition if caffeinated drinks replace healthy drinks, such as pure water and freshly pressed juices. A child who consumes caffeine may also eat less, because caffeine can reduce the appetite.
The American Medical Association Council on Scientific Affairs states that moderate tea or coffee drinking likely has no negative effect on health, as long as you live an otherwise healthy lifestyle.
- Three 8 oz. cups of coffee (about 250 milligrams of caffeine) per day is considered an average or moderate amount of caffeine.
- Ten 8 oz. cups of coffee per day is considered excessive intake of caffeine.
People who may want to avoid caffeine or only drink small amounts of it include:
- People who are prone to stress, anxiety, or sleep problems
- Women with painful, lumpy breasts
- People with acid reflux or stomach ulcers
- People with high blood pressure that does not respond to treatment
- People who have problems with fast or irregular heart rhythms
- People who have chronic headaches
Carefully watch how much caffeine a child gets. Even though caffeine is safe in moderate amounts, it is a stimulant. A hyperactive child may need to avoid caffeine.
Small amounts of caffeine during pregnancy are safe, but large amounts are strongly discouraged.
- Caffeine, like alcohol, travels through your bloodstream to the placenta and can have a negative affect on your baby. Because caffeine is a stimulant, it increases your heart rate and metabolism — both of which directly affect the baby.
- It is okay to have one or two cups of coffee, tea, or cola a week, but try to give them up completely if you can.
Many drugs will interact with caffeine. Talk to your health care provider or pharmacist about possible interactions with caffeine whenever you take medications.