Caffeine is a drug that is naturally produced in the leaves and seeds of many plants. It's also produced artificially and added to certain foods.
Caffeine is defined as a drug because it stimulates the central nervous system, causing increased alertness. Caffeine gives most people a
temporary energy boost and elevates mood.
For most people, the amount of caffeine in two to four cups of coffee a day is not harmful. However, too much caffeine can make you restless,
anxious and irritable. It may also keep you from sleeping well and cause headaches, abnormal heart rhythms or other problems. If you stop
using caffeine, you could get withdrawal symptoms. Some people are more sensitive to the effects of caffeine than others. They should limit
their use of caffeine. So should pregnant and nursing women. Certain drugs and supplements may interact with caffeine. If you have questions
about whether caffeine is safe for you, talk with your health care provider.
http://www.nlm.nih.gov/medlineplus/caffeine.html

Side Affects of Caffiene use:
Irrittation of stomach or intestines
Chronic trouble sleeping
Over excitement
Dizziness
Involunatry quivering
Fast heartbeat
Vommitting
Diarrhea

What contains caffiene?
Milligrams of Caffeine
Item
Typical
Range*
Coffee (8-oz. cup)




Brewed, drip method
85
65-120
Instant
75
60-85
Decaffeinated
3
2-4
Espresso (1 oz. cup)
40
30-50
Teas (8-oz. cup)




Brewed, major U.S. brands
40
20-90
Brewed, imported brands
60
25-110
Instant
28
24-31
Iced (8-oz. glass)
25
9-50
Some soft drinks (8 oz.)
24
20-40
Cocoa beverage (8 oz.)
6
3-32
Chocolate milk beverage (8 oz.)
5
2-7
Milk chocolate (1 oz.)
6
1-15
Dark chocolate, semi-sweet (1 oz.)
20
5-35
Baker's chocolate (1 oz.)
26
26
Chocolate-flavored syrup (1 oz.)
4
4