Within one hour of eating or drinking caffeine, it reaches its peak level in your blood.

May interfere with the absorption of calcium in the body.

Increases the release of acid in your stomach, sometimes leading to an upset stomach or heartburn.

Is a diuretic, meaning that it helps your body get rid of extra salt and water by urinating more.

Stimulates your central nervous system, which can make you feel more awake and give you a boost of energy.

The amount of caffeine in different drinks can vary a lot, but it is generally:Ĭaffeine has many effects on your body's metabolism. Most people consume caffeine from drinks. So do energy drinks and 'energy-boosting' gums and snacks. For example, some pain relievers, cold medicines, and over-the-counter medicines for alertness contain synthetic caffeine. There is also synthetic (man-made) caffeine, which is added to some medicines, foods, and drinks.

Cacao pods, which are used to make chocolate products.

Kola nuts, which are used to flavor soft drink colas.

Caffeine is a bitter substance that occurs naturally in more than 60 plants including:

I have an effect on you