Try not to have a big meal within 2 hours of your appointment, as the process of digestion will alter your pulse. Also avoid alcohol and drinks containing caffeine (coffee, Coke etc,) and other stimulants. Also avoid eating or drinking anything that could temporally change the natural colour of your tongue e.g. beetroot, chocolate etc.
Since the practitioner may need to insert needles in your back, abdomen etc., wear easily removable casual clothing, your practitioner will be mindful of your right to privacy and modesty.