It also depends on whether your body is used to getting regular doses of caffeine and how much you have in one serving. How you react to caffeine depends on your body mass, health and metabolism. first feeling energetic but then having an even greater feeling of tiredness.Some of the signs and symptoms of having too much caffeine include: Depending on the individual, these effects can last up to 12 hours. These effects can include increased breathing and heart rate, and increased mental alertness and physical energy. What does caffeine do to your body?Ĭaffeine is well absorbed by the body, and the short-term effects are usually experienced between 5 and 30 minutes after having it. Like many other drugs, it’s possible to develop a tolerance to caffeine, which means you need bigger and bigger doses to achieve the same effect. In large doses, caffeine can make you feel anxious and have difficulty sleeping. In small doses, caffeine can make you feel refreshed and focused. It also increases the circulation of chemicals such as cortisol and adrenaline in the body.

Guarana (a popular additive in energy drinks) is also a natural source of caffeine.Ĭaffeine is a stimulant, which means it increases activity in your brain and nervous system. It may also be in chocolate bars, energy bars and some non-prescription medications, such as cough syrup and slimming tablets. It is in coffee, black and green tea, cocoa, cola soft drinks and energy drinks. Caffeine is naturally found in the leaves and fruits of some plants.

Caffeine supplement