Caffeine is the only drug that is present naturally or added to widely consumed foods. Heavy daily caffeine use (more than 500 mg/day) may cause side effects such as insomnia, irritability, restlessness, stomach upset, and/or muscle tremors. Check out this link for for a list of the caffeine content of beverages and foods and see if you need to curb your consumption. http://ow.ly/Sx5Hk
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