Here's an article I found on caffeine withdrawal.

Susan Todd loves her daily coffee fix. "I can drink four or five cups, easily,comfortably," said Todd, 59, of Clinton Township, Michigan.

But if she skips her regular dose of caffeine, Todd warned, watch out.

"I feel lousy all over. It's not that anything hurts," she explained. "I just feel sluggish, and a cup of caffeine will cure that."

Todd is among the estimated 80 to 90 percent of North American adults and children who consume caffeine products every day. Experts estimate about half that number will experience headaches and other symptoms from caffeine withdrawal syndrome.

There are a numberof reasons why someone might need to reduce or stop their daily caffeine intake.Experts tell pregnant women not to consume more than 200 milligrams of caffeinea day (about one 12-ounce cup of coffee). Caffeinated products are notrecommended for people who are prone to panic attacks or those who suffer fromanxiety. Some surgical patients may also experience the symptoms of caffeinewithdrawal syndrome on the day of surgery, because they are told not to eat ordrink anything.

Researchers atJohns Hopkins University in Baltimore, Maryland, recognized the condition as adisorder five years ago after reviewing decades of studies. They concluded thehigher the caffeine intake, the more likely a patient was to suffer from severewithdrawal symptoms when denied the ingredient.

Researchers also reported that some caffeine users considered themselves addicted to caffeine because they were unable to quit or cut down on their usage.

Michael Kuhar,chief of the division of neuroscience at the Yerkes National Primate ResearchCenter at Emory University in Atlanta, Georgia, prefers to use the word"dependent" rather than "addicted." Even though he called caffeine a drug, Kuhar wouldn't go so far as saying it has reached the statusof cocaine or heroin.

According toKuhar, caffeine is a mild stimulant. "If you take a cup of caffeine you'relikely to feel good and energized," he said.

Miss that cup of"Joe" or can of cola and don't be surprised if you start feelingfunny, Kuhar warned. He said some people complain of "headache, fatigue,sleepiness, inability to focus and concentrate." Others report experiencing flu- like symptoms, irritability, depression and anxiety after skipping aslittle as one cup of coffee a day.

Kuhar explainedthat caffeine blocks receptors in the brain that can dilate blood vesselscausing headaches. "Withdrawal symptoms can start from 12 to 20 hoursafter your last cup of coffee and peak about two days later and can last aboutas long as a week," Kuhar added.

It is not justcoffee that can lead to caffeine withdrawal. While a 6-ounce cup of brewed coffee contains about 100 milligrams of caffeine, tea and cola have about 40milligrams each, a bar of milk chocolate has about 10 milligrams and hot chocolate has about 7 milligrams.

Kuhar said that means adults as well as children may be suffering daily physiological and personality effects of caffeine withdrawal.

He recommended that people who are motivated to give up caffeine, or cut back on consumption,do so very carefully. "The thing to do is what we do with so many drugs --basically you wean yourself off slowly," Kuhar suggested. "That doesn't mean it is going to be easy at every step, but it should be easier thangoing cold turkey."

Johns Hopkinsresearchers also endorsed a stepped approach to quitting caffeine. Theyinstruct patients to gradually substitute decaffeinated products ornoncaffeinated products over time in order to reduce the likelihood of experiencing withdrawal symptoms.

Kuhar suggested the process also can begin with reducing caffeine consumption by a half to a whole cup a day.

Technology consultant ***** Spillane, 42, of St. Petersburg, Florida, started a step-down program after years of consuming up to three cups of coffee each day. He felthe was "drinking way too much caffeine."

Spillane said heknew right away that he was suffering from caffeine withdrawal when he started getting severe headaches. His wife told him he was cranky most of the time.

He now drinks tea instead, and occasionally sneaks a cup of coffee. Looking back,  he was going through withdrawal was "tough for a while," but he's feeling better these days and he's glad he's not so dependent on caffeine.

Source: Caffeine