What are common signs of caffeine intoxication?

Caffeine intoxication is characterized by a range of symptoms resulting from the consumption of excessive amounts of caffeine, typically defined as consuming more than 400 mg per day for most adults. The correct answer highlights common signs such as restlessness, a flushed face, and muscle twitching.

Restlessness is a direct result of caffeine's stimulant effects on the central nervous system. It increases alertness and energy levels, often leading to an inability to relax properly. A flushed face can occur due to the increased heart rate and heightened blood circulation, which are also side effects of caffeine’s stimulating attributes. Muscle twitching may arise as a result of overstimulation of the nervous system, producing involuntary contractions in the muscles.

These symptoms align with the physiological effects of high caffeine consumption, which primarily involves heightened arousal levels and can lead to anxiety or discomfort in some individuals. This combination of physical and neurological signs effectively represents caffeine intoxication, making this option the most accurate description of its symptoms.