She waited before pouring more. Caffeine can improve alertness, attention, and reaction time when consumed in moderate amounts (Institute of Medicine 74). For many people, a single cup supports mental focus without strain, especially when paired with food (Smith 35). She noticed the lift arrive gently, not sharply, and decided that was enough.
Warning: Excess caffeine may cause jitteriness, anxiety, rapid heartbeat, gastrointestinal upset, or disrupted sleep, particularly in sensitive individuals (Mayo Clinic Staff). Pregnant individuals and those with heart conditions, anxiety disorders, or hypertension are advised to limit intake. Stop consumption and seek medical advice if palpitations, dizziness, or severe restlessness occur (U.S. Food and Drug Administration).
She rinsed the mug and stepped away. Enjoyment worked best when it stopped short of excess.
Works Cited (MLA)
Institute of Medicine. Caffeine for the Sustainment of Mental Task Performance. National Academies Press, 2001.
Mayo Clinic Staff. “Caffeine: How Much Is Too Much?” Mayo Clinic, 2023.
Smith, Andrew. “Effects of Caffeine on Human Behavior.” Food and Chemical Toxicology, vol. 40, no. 9, 2002, pp. 1243–1255.
U.S. Food and Drug Administration. “Spilling the Beans: How Much Caffeine Is Too Much?” FDA, 2023.
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