Caffeine

It actually depends on how the coffee was prepared from harvest to packaging and the amount you would take. Like if it's ground or tea leaves, brewed or instant, weak or strong. Approximately, a regular cup of coffee contains 100mg of caffeine but it may range between 40 and 176 mg and the mean is closer to 85mg.
Brewed: 107.5 milligrams

Decaf Brewed: 5.6 milligrams

Decaf Instant: 2.5 milligrams

Drip: 145 milligrams

Espresso: 77 milligrams

Instant: 57 milligrams
between 80 and 100 mgs
Approx. 100mg per cup for normal drip brewed coffee
Many people are now buying their coffee to go, typically in 16 ounce cups. One 16 ounce cup of coffee has around 300 mg of caffeine.
About 100mg.
There is no particular average cup or serving size of coffee since the strength can vary greatly. If an individual was to assume an average cup of 8 oz. then it can vary from 40 to 100 grams of caffeine.
1 Cup of coffee contains 100mg of caffeine. That number can vary slightly depending on the brand of coffee.

Humans have consumed caffeine since the Stone Age. Early peoples found that chewing the seeds, bark, or leaves of certain plants had the effects of easing fatigue, stimulating awareness, and elevating one's mood. Only much later was it found that the effect of caffeine was increased by steeping such plants in hot water. Many cultures have legends that attribute the discovery of such plants to people living many thousands of years ago.

According to one popular Chinese legend, the Emperor of China Shennong, reputed to have reigned in about 3000 BC, accidentally discovered that when some leaves fell into boiling water, a fragrant and restorative drink resulted. Shennong is also mentioned in Lu Yu's Cha Jing, a famous early work on the subject of tea. The history of coffee has been recorded as far back as the ninth century. During that time, coffee beans were available only in their native habitat, Ethiopia. A popular legend traces its discovery to a goatherder named Kaldi, who apparently observed goats that became elated and sleepless at night after grazing on coffee shrubs and, upon trying the berries that the goats had been eating, experienced the same vitality. The earliest literary mention of coffee may be a reference to Bunchum in the works of the 9th-century Persian physician al-Razi. In 1587, Malaye Jaziri compiled a work tracing the history and legal controversies of coffee, entitled "Undat al safwa fi hill al-qahwa". In this work, Jaziri recorded that one Sheikh, Jamal-al-Din al-Dhabhani, mufti of Aden, was the first to adopt the use of coffee in 1454, and that in the 15th century the Sufis of Yemen routinely used coffee to stay awake during prayers.

Towards the close of the 16th century, the use of coffee was recorded by a European resident in Egypt, and about this time it came into general use in the Near East. The appreciation of coffee as a beverage in Europe, where it was first known as "Arabian wine," dates from the 17th century. A legend states that, after the Ottoman Turks retreated from the walls of Vienna after losing a battle for the city, many sacks of coffee beans were found among their baggage. Europeans did not know what to do with all the coffee beans, being unfamiliar with them. So Franz George Kolschitzky, a Pole who had actually worked for the Turks, offered to take them. He subsequently taught the Viennese how to make coffee, and the first coffee house in the Western world was opened in Vienna, thus starting a long tradition of coffee appreciation. In Britain, the first coffee houses were opened in London in 1652, at St Michael's Alley, Cornhill. They soon became popular throughout Western Europe, and played a significant role in social relations in the 17th and 18th centuries.

The kola nut, like the coffee berry and tea leaf, appears to have ancient origins. It is chewed in many West African cultures, individually or in a social setting, to restore vitality and ease hunger pangs. In 1911, kola became the focus of one of the earliest documented health scares when the US government seized 40 barrels and 20 kegs of Coca-Cola syrup in Chattanooga, Tennessee, alleging that the caffeine in its drink was "injurious to health". On March 13, 1911, the government initiated United States v. Forty Barrels and Twenty Kegs of Coca-Cola, hoping to force Coca-Cola to remove caffeine from its formula by making claims, such as that the excessive use of Coca-Cola at one girls' school led to "wild nocturnal freaks, violations of college rules and female proprieties, and even immoralities." Although the judge ruled in favor of Coca-Cola, two bills were introduced to the U.S. House of Representatives in 1912 to amend the Pure Food and Drug Act, adding caffeine to the list of "habit-forming" and "deleterious" substances, which must be listed on a product's label.

The earliest evidence of cocoa bean use comes from residue found in an ancient Mayan pot dated to 600 BC. In the New World, chocolate was consumed in a bitter and spicy drink called xocoatl, often seasoned with vanilla, Chile pepper, and achiote. Xocoatl was believed to fight fatigue, a belief that is probably attributable to the theobromine and caffeine content. Chocolate was an important luxury good throughout pre-Columbian Mesoamerica, and cocoa beans were often used as currency.

Xocoatl was introduced to Europe by the Spaniards and became a popular beverage by 1700. They also introduced the cacao tree into the West Indies and the Philippines. It was used in alchemical processes, where it was known as Black Bean.

The leaves and stems of the Yaupon Holly (Ilex vomitoria) were used by Native Americans to brew a tea called Asi or the "black drink". Archaeologists have found evidence of this use stretch back far into antiquity, possibly dating to Late Archaic times.

Source: Wikipedia

I don't believe that's true. Caffiene addiction has nothing to do with blood sugar. It is usually diagnosed by a sense of anxiety bordering on panic, tolerance to caffiene (ie being able to sleep after drinking coffee all day....although fitfully)and a sense of depression following the stimulant effect. Want to know if you are addicted?? Just stop drinking coffee and wait until (or if ) you develop a headache that goes away with caffiene ingestion. More that 200 mg of caffiene a day is considered in the addictive state.

Well Caffiene is a diacritic (it makes you pee a lot) so yes a caffeine addiction could mimic the symptoms. For Gods sake though if you think you may be a diabetic go to the Dr and get tested.

Sprite does not have caffeine in it.

Coca Cola produces a caffeine free version that tastes exactly like regular Coke.
usually they are not dark, like sprite or fanta. check the label, they will say no caffeine.