Via Scoop.itHealthcare Continuing Education

Dependency on caffeine can start at 100 milligrams a day, resulting in side effects like headache, nausea, fatigue, moodiness or fuzziness if you stop drinking it. Side effects like dehydration, headaches, anxiety and insomnia can occur in those drinking more than 500 milligrams of caffeine a day. The overall issue is how it affects people. You know whether you are getting too much if it bothers you.
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