Side Effects of Caffeine Ingestion Caffeine is widely used as a stimulant, but like any other drug it carries risks and side effects. While moderate caffeine consumption of three or fewer eight ounce cups of coffee each day can have stimulating effects and isn't considered harmful, excessive caffeine intake can cause symptoms including: Increased heart rate Vomiting Nausea Excessive urination Anxiety Restlessness Depression Tremors Difficulty sleeping Caffeine is a diuretic, so excessive caffeine consumption can contribute to dehydration, especially when coupled with low fluid intake. Care should be taken when coupling caffeine consumption with high levels of physical activity or when consuming caffeine during hot weather, as it causes your body to lose more fluids than normal. source:http://www.fitday.com/fitness-articles/nutrition/healthy-eating/the-side-effects-of-caffeine.html#b
