The slim-lined cans promise an energy hit that will have you flying through your day of study, work or play. Energy drinks are now a popular choice for teenagers and young adults as opposed to a good old cup of coffee. One study found energy drinks are consumed by 30-50% of adolescents and young adults (Seifert SM, Schaechter JL, Hershorin ER and Lipshultz SE). But do these fizzy, sugary and caffeine-loaded “supplements