First 10 Minutes
The caffeine enters your bloodstream. Your heart rate and blood pressure start to rise.
After 20 Minutes
You feel more alert and focused. You find it easier to make informed decisions and handle problems. In addition, the caffeine can help you feel less tired by connecting to your brain's adenosine receptors.
After 30 Minutes
Your body starts to produce more adrenaline. This can lead to sharper vision because your pupils dilate slightly.
40 Minutes Later
The level of serotonin in your body begins to rise. This improves the functioning of the motor neurons which, in their turn, increase muscle strength.
4 Hours Later
Coffee can increase the rate at which your cells release energy. When this happens, your body starts to break down fats, even if you don't move. Caffeine also stimulates and increases the production of stomach acids.
6 Hours Later
The caffeine in coffee causes a diuretic effect. Apart from water, your body also loses some essential vitamins and minerals.