Shingles vaccine; Energy drinks; Liver function tests; Anorexia

Margaret McCartney reports on confusion around the new Shingles Vaccine - including how old you have to be to qualify and why there's a lack of supply in some GP surgeries.Why readymade drinks combining caffeine and alcohol have been banned in America.Are the tests GP's use to screen for liver damage falsely reassuring?And a leading authority dispels myths surrounding the causes of anorexia.