Bob Tait, of Drug Education UK, has issued a warning that consuming energy drinks like Red Bull may cause pupils to have headaches, chest pain and can make them hyperactive as well.
The Nursing Standard magazine reported that Mr Tait, who delivers drug awareness classes in schools, had talked to many pupils who consumed energy drinks in excess of recommended levels.
"I came across one boy who was having eight a day. That is too much," Tait said. "It is hard to say in how many schools it is a problem, but it is certainly beginning to cause concern."