Which of the following is NOT a symptom of caffeine intoxication?

Caffeine intoxication is characterized by various physiological and psychological symptoms that arise from excessive consumption of caffeine. Common symptoms include muscle twitching, increased urinary output (diuresis), and feelings of restlessness or nervousness.

Muscle twitching can occur due to the stimulatory effects of caffeine on the central nervous system, where increased neural activity might result in involuntary muscle contractions. Increased diuresis is a known effect of caffeine as it acts as a diuretic, promoting the elimination of water from the body. Additionally, restlessness and heightened energy levels are typical experiences for individuals consuming high amounts of caffeine, reflecting its stimulating properties.

Weight gain, however, is not associated with caffeine intoxication. In fact, caffeine is often linked to temporary weight loss or reduced appetite due to its stimulating effects and role in increasing metabolic rate. Thus, it stands out as the symptom that does not conform to the manifestations of caffeine intoxication.