If you’re like me, you rely on a cup of coffee to help you get started first thing in the morning. A warm, steamy brew with an aroma that whiffs by gently as you take your first sip — just imagining it is enough to awaken the senses.

For centuries, we’ve been enchanted by this drug for its miracle effects on our bodies. Since the early discovery of caffeine’s stimulant effect, studies have since linked the drug to reduced risk of heart disease, type 2 diabetes, and cancer.

But that caffeine also has a dark side. Drinking numerous cups in a day can leave you feeling jittery during the day and restless at night. Of course, caffeine tolerance varies by person, but four cups of coffee seems to be within the safe zone for healthy adults.

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