Caffeine is a stimulant that affects the Central Nervous System and a diuretic substance that helps rid your body of fluids. It comes from the leaves, seeds, and fruits of many plants including:\n\nTea leaves\nKola nuts\nCocoa beans\nCoffee beans\n\nIt can also be found in chocolate products and some soft drinks and is often added to many over-the-counter medicines such as pain relievers and cold medicines.\nHow Does Caffeine Affect the Body?\nIt quickly passes into the central nervous system and eventually passes out of the body in the urine. Normally, half of the amount consumed leaves the body within five to seven hours.\nIts effects range from a mild increase in alertness to anxiety, tension, and irritability. There is no proof that it improves creativity or work performance or that it increases energy levels. In fact, many researchers believe that too much interferes with work performance.\nIs it safe in small amounts?\nModest amounts have not been associated with any health risks. You can safely consume about 250 mg each day. This is equal to three 8-ounce cups of coffee, two 8-ounce chocolate bars, or about 5 cups of tea.\nWhat is caffeine sensitivity?\nSome people have unwanted, or negative, side effects when they have a certain amount of it. This is called \u201ccaffeine sensitivity.\u201d Negative side effects can include:\n\nIncreased heart rate\nNausea\nVomiting\nRestlessness\nAnxiety\nDepression\nTremors\nDisturbed sleeping patterns\n\nWho should avoid it?\n\nInfants and children\nInfants should not be given drinks that contain it. Children may be more likely to have caffeine sensitivity because of their smaller body size. Limit the amount in your child\u2019s diet. If your child has too many caffeinated drinks, he or she may be missing out on other more nutritional drinks, like milk or juice.\nPregnant women and nursing mothers\nMost doctors either recommend that pregnant women not use caffeine or limit its usage. Nursing mothers also should not have too much. It could interfere with the baby\u2019s sleep since it crosses into the mother\u2019s milk.\nPeople with heart problems\nIt can cause irregular heartbeats in some people. Therefore, many doctors recommend eliminating or restricting caffeine for patients with heart problems, high blood pressure, or a history of irregular heartbeats.\n\nCut back slowly\nIf you want to cut down on the amount in your diet, try cutting back slowly to reduce the side effects.\nPeople who consume large amounts on a regular basis may get mild headaches and feel tired if they stop having it all at once.\nHave a glass of water in between each cup of coffee or soda. Mix a half of a cup of decaf with a half of a cup of regular coffee. Gradually increase the amount of decaf and decrease the regular until you are only drinking decaf.\nMany people think they need it to wake up in the morning. If you get a good night\u2019s sleep, you\u2019ll feel rested when you get up, and you\u2019ll be able to skip the caffeine.