Chronic Fatigue Syndrome, also known as ME, should be treated with a form of behavioural therapy or exercise, say British scientists. Writing in The Lancet, they argue that the approach preferred by some charities, managing energy levels, is less successful. A quarter of a million people in the UK have the condition, yet its cause remains unknown. The authors say cognitive behavioural and graded exercise therapies were the most successful, both at reducing fatigue and increasing physical function. The authors suggest that poor advice, such as suggestions to just go to the gym, could be responsible for bad experiences with the exercise therapy.