<human>:  What are the effects of caffeine on the human body?
<bot>: The effects of caffeine on the human body can vary depending on the individual. Generally, caffeine acts as a stimulant to the body and can have positive effects such as increased alertness, improved concentration, increased energy, improved mood and reduced fatigue. However, consuming too much caffeine can have negative effects such as increased anxiety, restlessness, insomnia, increased heart rate and increased blood pressure. It is important to be mindful of the amount of caffeine consumed in order to avoid any negative or unpleasant effects.