What is Caffeine?

Caffeine is a chemical that works by stimulating the brain and central nervous system, helping you stay awake and alert.

Caffeine is found naturally in coffee beans, tea leaves (green, black, and white tea), cacao pods (chocolate), kola nuts (used in cola drinks), yerba mate and guarana plants. Caffeine molecule can also be created in a laboratory and added to products. This synthetic caffeine is chemically identical to natural caffeine. It is often added to energy drinks and sodas, over-the-counter pain relievers, weight-loss supplements and pre-workout fitness powders.

How Caffeine Works in Your Body?

While you’re doing especially hard jobs, a chemical called adenosine will build up in your brain, binding to special receptors and making you feel tired. Caffeine molecule has a similar shape to adenosine and it sneaks into those same receptors and blocks them. Because adenosine can’t bind those receptores anymore, you don’t feel sleepy. At the same time, caffeine increases the release of other brain chemicals like dopamine and adrenaline, which make you feel more energized and focused.

For most healthy adults, a moderate caffeine intake (about 400 mg per day, roughly 4 cups of coffee) can provide increased alertness and concentration, improved physical performance and endurance and enhanced short-term memory. Especially in coffee and tea contain antioxidants that may protect against some diseases.

How Long the Effects of the Caffeine Lasts?

Caffeine is absorbed into your bloodstream quickly, usually peaking in your blood within 30 to 60 minutes after consumption. Caffeine effects generally last for 3 to 5 hours, but it has a “half-life” of about 5 to 6 hours (meaning half of the caffeine is still in your system after that time). Caffeine can stay in your system for up to 10 hours, which is why drinking coffee late in the afternoon can disrupt your sleep.

Individual Sensitivity of the Caffeine

People process caffeine at different speeds based on genetics, age, weight, liver health, and whether they are pregnant. Some people have a genetic variant that makes them process caffeine very quickly, while others break it down very slowly. Pregnant women are generally advised to limit caffeine to under 200 mg per day.

Side Effects and Risks of the Caffeine

Because caffeine is a chemically psychoactive drug, consuming too much caffeine can cause negative side effects. Side effects of caffeine are like that; slepplessnes (insomnia) and restlessness, rapid heart rate (tachycardia), jitters, anxiety, and nervousness, stomach upset or acid reflux, headaches (often from withdrawal). Because of the caffeine dependence your body can build a tolerance, meaning you need more to get the same effect.

While caffeine is generally considered safe, it is a psychoactive drug. In extremely high doses (over 1,200 mg quickly), it can become toxic and cause seizures or cardiac arrest, which is why concentrated pure caffeine powders are heavily regulated.