Need your morning coffee?

Even if you drink just one cup of coffee a day, skipping it may cause caffeine withdrawal symptoms such as irritability, fatigue and poor concentration.

According to research at Johns Hopkins University in Baltimore, the side effects in 13 percent of people studied were so severe that many missed work.  Up to 300 milligrams of caffeine (three six-ounce/170-millilitre cups of coffee) a day is generally considered safe. 

If you are trying to cut back, reduce your intake by 10 percent every three or four days by choosing non-caffeinated beverages instead.