A well balanced diet, lots of fresh fruit and vegetables, pasteurised dairy products, well cooked red meat, chicken and fish. Avoid soft cheeses, raw or lightly cooked eggs, raw meat, shellfish. No liver, game or cured meats.

Try not to have more than 200mgs of caffeine a day (2 cups of instant coffee or four small bars of dark chocolate). Herbal teas are similar, no more than 2 a day. No alcohol or illegal drugs.