Moderate caffeine intake can increase alertness and improve sports performance, though excessive consumption may cause heart palpitations and jitteriness [1].

Understanding the balance of caffeine intake is critical for athletes and casual users because the stimulant affects both physical output and mental focus. While it can reduce the perception of effort, overconsumption can lead to adverse physiological reactions that hinder performance.

Approximately 80% of the world's population consumes caffeine daily [2]. The average daily intake for an individual is about 200 mg [2]. These effects are typically observed during athletic activity within 30 to 60 minutes after ingestion [2].

Lindsay Honaker, a sports psychiatrist and bodybuilder, said caffeine acts as an ergogenic aid. The substance works by antagonizing adenosine receptors, which increases dopaminergic and noradrenergic activity [1, 3]. This process heightens arousal and can enhance muscular contraction and reaction time [1, 3].

These benefits extend across various environments, from traditional gyms to eSports arenas. In professional gaming, caffeine has been linked to enhanced shooting skills and faster reaction times [4].

However, the benefits of the stimulant have a ceiling. Excessive intake can lead to stomach issues, and overstimulation of the cardiovascular and nervous systems [1]. When the nervous system is overstimulated, the resulting jitteriness can negate the focus and precision required for high-level athletic or cognitive tasks [1].

Because the substance is so widely available, users often overlook the narrow window between a performance boost and a systemic crash. The impact varies based on the individual's tolerance and the dosage consumed prior to activity [1, 2].

“Approximately 80% of the world's population consumes caffeine daily”

The widespread use of caffeine as a performance enhancer highlights a tension between cognitive arousal and physiological stability. While the antagonism of adenosine receptors provides a measurable edge in reaction time and muscle contraction, the risk of cardiovascular strain suggests that caffeine is a tool with a strict threshold for efficacy. For athletes and eSports competitors, the utility of the substance depends entirely on dosage precision.