| http://www.w3.org/ns/prov#value | - Heavy daily caffeine use - more than 500 to 600 mg a day, about four to seven cups of coffee - can cause: insomnia, nervousness, restlessness, irritability, nausea or other gastrointestinal problems, fast or irregular heartbeat, muscle tremors, headaches and anxiety.Whoa.It seems I am right on the border of too much, and I think Mark might vouch for me when I say that I can on occasion be irritabl
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