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It's fine in moderation, but excessive amounts of caffeine can cause anxiety, panic attacks, and problems sleeping. Now there are concerns that young people are having too much of the stimulant. England is considering banning the sale of energy drinks to under-18s, while South Korea is suggesting a ban on coffee in schools. Â鶹Éç health reporter Alex Therrien explains what you need to know about caffeine consumption. (Image: Two cups of latte coffee, credit: Mark Ralston/AFP/Getty Images)