How does caffeine affect your body?

Answer 1

It gives me headaches

Answer 2

Caffeine can affect your body in many ways. It's effect is going to greatly depend on how much you consume. Your body weight and how much you've had to eat will also play a role in caffeine's effect on your body. Some effects: increased heart rate; blood vessel constriction; diuresis (the caffeine draws water out of your body's tissues and turns it into urine) - this is your body's attempt to dilute the caffeine in your bloodstream. Too much caffeine can cause dehydration. Also, palpitations when you have overdone it with caffeine for the day; increased blood pressure; over time, loss of bone density.

edit: wow, I saw that other answer - should've googled it, too :p

Answer 3

Hello
Caffeine effects
The following are commonly attributed to over-use of caffeine:

1. Stimulates your heart, respiratory system, and central nervous system.

2. Makes your blood more `sludgy' by raising the level of fatty acids in the blood.

3. Causes messages to be passed along your nervous system more quickly

4. Stimulates blood circulation

5. Raises blood pressure

6. Causes your stomach to produce more acid

7. Irritates the stomach lining

8. Makes digestion less effective by relaxing the muscles of your intestinal system

9. Its diuretic effect caused increased urination

10. Stimulates the cortex of your brain heightening the intensity of mental activity. This can result in a temporary feeling of alertness and, in the short term, banishes drowsiness and feelings of fatigue. In those who already have high levels of anxiety the heightened intensity of mental activity can produce unpleasant effects.

11. Affects the length and quality of sleep. Heavy caffeine users suffer from sleep-deprivation because their nervous system is too stimulated to allow them deep, restful or prolonged sleep.

12. The American Medical Journal has reported a correlation between caffeine and decreased bone density or osteoporosis in women.

In addition to the above effects prolonged or heavy caffeine use can produce more uncomfortable experiences:

13. `Caffeine nerves' a jittery feeling with shaking hands, palpitations, and wobbliness in the legs.

14. Caffeine addiction which involves nervousness, irritability, agitation, headaches or ringing in the ears.

15. Causes your adrenal glands to release their hormones into your bloodstream

16. Causes blood sugar, or blood glucose, to be released from storage through the effects of the adrenal hormones. This gives you a temporary lift but…

17. …requires your pancreas to over-work. This is because your pancreas now has to produce extra insulin to reduce this extra blood sugar. Once the extra insulin has 'mopped up' the extra blood sugar your temporary lift from the caffeine ends.

Your vitality level is back to normal. However in heavy caffeine users the pancreas, in time, becomes over-sensitive and over-zealous. Now it begins producing too much insulin – it 'mops up' not just the excess blood sugar but the blood sugar you need to feel alert and energetic. The initial effect of this is a let-down effect and a craving for more caffeine to give you a further boost. A later effect can be excessive and chronic tiredness, even on waking in the morning. Some people find that many of the psychological complaints common to reactive hypoglycaemia (the emotional yo-yo effect, shakiness, palpitations, weakness, tiredness, etc.) disappear within a few days of stopping caffeine.

NOTE: The fact that caffeine can produce these sensations and symptoms does not mean that it is the 'only' cause of such symptoms. But if you experience similar symptoms and your medical advisor confirms that they do not have a verifiable organic cause then you may wish to cut out caffeine for a few weeks to see if the symptoms reduce or disappear.

Answer 4

Caffeine is a central nervous system (CNS) stimulant, having the effect of temporarily warding off drowsiness and restoring alertness. Caffeine is the world's most widely consumed psychoactive substance, but unlike most other psychoactive substances, it is legal and unregulated in nearly all jurisdictions.

Caffeine is completely absorbed by the stomach and small intestine within 45 minutes of ingestion. After ingestion it is distributed throughout all tissues of the body and is eliminated by first-order kinetics.[24]

The precise amount of caffeine necessary to produce effects varies from person to person depending on body size and degree of tolerance to caffeine. It takes less than an hour for caffeine to begin affecting the body and a mild dose wears off in three to four hours.[23] Consumption of caffeine does not eliminate the need for sleep: it only temporarily reduces the sensation of being tired.

With these effects, caffeine is an ergogenic: increasing the capacity for mental or physical labor. A study conducted in 1979 showed a 7% increase in distance cycled over a period of two hours in subjects who consumed caffeine compared to control tests.[35] Other studies attained much more dramatic results; one particular study of trained runners showed a 44% increase in "race-pace" endurance, as well as a 51% increase in cycling endurance, after a dosage of 9 milligrams of caffeine per kilogram of body weight.[36] The extensive boost shown in the runners is not an isolated case; additional studies have reported similar effects. Another study found 5.5 milligrams of caffeine per kilogram of body mass resulted in subjects cycling 29% longer during high intensity circuits.[37]

A study has found that caffeine blocks the effects of dihydrotestosterone (DHT), known to damage hair follicles.[67][68] Scientists estimate up to 60 cups of coffee a day would be needed for significant amounts to reach follicles in the scalp, prompting German cosmetics firm Alpecin to develop caffeine-rich solutions for topical application to the head.

Answer 5

If you have caffeine from natural drink like coffee it should not affect your body very much especially if you have coffee everyday,

Answer 6

Caffeine is the number 1 mood altering drug, it also is an adective chemical which constricts blood vessles and can diolate eyes.

Answer 7

It elevates one's blood pressure by constricting blood volume. It can also cause greater alertness but also produce unwanted effects like jitteriness and trembling of the hands...a little goes a long way.

Answer 8

it's very addicting.caffeine can give u bad headaches.