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Caffeine metabolism has to do with your genetic makeup. The slower you metabolize caffeine, the more effect it will have on you. The cause for the differences that people have in how fast they metabolize caffeine has to depend on the CYP1A2 gene. Variants of this gene can cause you to metabolize faster or slower. The C allele variant in the AHR gene, which ...


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All caffeinated beverages like coffee (even decaffeinated) and soft drinks give short bursts of energy, temporarily raise blood pressure, and reduces blood flow to inactive limbs. Soon after you drink coffee (containing caffeine), it’s absorbed through the small intestine and dissolved into the bloodstream and it’s able to penetrate the blood-brain barrier ...


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Stress and excitement both activate the sympathetic nervous system, so they can feel very physically similar (high heart rates, etc.) The main difference is in higher-level brain processing, where stress is subjectively perceived as negative and excitement as positive. Interestingly, there is a study that proposes "anxiety reappraisal" in which you tell ...


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It is safest to be evaluated by a medical professional. The rules of HealthSE don't permit personal health advice questions. If you are still experiencing symptoms - as above, get seen urgently or phone for help.


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