‘Well, what diets have you tried so far?’ asked the GP, flicking through the patient’s notes. I was an innocent trainee doctor on my general practice placement at the time and watched the interaction carefully, sensing a row was about to ensue. ‘Look, I don’t want to go on a diet, I want you to prescribe me these,’ snapped the patient, bringing out a neatly folded page she had torn out of a magazine.