The hidden danger of energy drinks. A doctor explains

(CNN) — It is possible to drink too much caffeine, as actor Dakota Johnson recently found out after she had lots of caffeine-infused energy drinks while directing her first movie and found herself feeling jittery and having trouble sleeping. Johnson, who was making her directorial debut in the short film “Loser Baby,” thought her energy drink was a “natural drink.” She told Variety she didn’t realize that “I was basically overdosing on caffeine.

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