We often hear and read about caffeine found in a number of common drinks and foods. However, if used excessively, they can cause collateral damage in adults and children. Caffeine exists in over 60 species of plants and caffeine is a stimulating substance normally found in coffee, tea, soft drinks and chocolate. Energy drinks are also available in some medications. Caffeine is the alkaloid substance, and there are articles and several vehicles classified as semi-alkalis, including methylxanthines, which consist of three vehicles: theophylline, caffeine, theobromine, which is found in the coffee, tea and other plants. These compounds have a different biological effect and chemistry in different proportions. Despite this, these compounds are similar but different only in terms of methyl group content (methylCH3), but readily oxidize and transform into uric acid and other acids of similar chemical composition. Caffeine and its breakdown products have many effects on the body. First, they disrupt the normal functioning of adenosine receptors, biochemical control switches found in the brain, kidneys, cardiovascular system, gastrointestinal tract, and respiratory system. Caffeine can trigger a classic fight or flight which is a conditional response that gives us increased strength, endurance and speed when we need it. For example, when we consume caffeine, the airways expand to increase oxygen availability, the liver releases sugars and fats into the blood to fuel the survival effort. Heart rate and blood pressure increase to provide fuel to the muscles and circulation is reduced in the digestive system to make more blood available to the muscles. As a result, caffeine physiologically causes the fight or flight mechanism (1 Stephen 57-58). The amount of caffeine in a cup of coffee ranges from 100 to 120 mg, per 6 ounce cup. and a cup of regular tea 50-80 mg, per 6 oz and a cup of green tea 35 mg, per 6 oz cup and a bottle of cola 64 mg, and a piece of chocolate weighing 50 grams 50 mg, even medicines Headache medications contain caffeine and some contain 30 to 65 mg per tablet. When we consume coffee, light or mixed with milk or at most, we mix with something the less caffeine, and the less cola and energy drink we consume, the less caffeine ends up in our body; therefore, we should not exceed the consumption of caffeine drinks by more than 2 cups per day (1Stephen 34-35). Side symptoms of caffeine include: “fast, irregular heartbeat, insomnia, nervousness, irritability, tremor, headache, abdominal pain, nausea, vomiting.” , diarrhea, increased deresis.