Read the text again. Match the sentences (A-F) to the gaps (1-5). There is one extra sentence .. Listen and check A If that sounds a bit complicated, try chunking instead B People with these abilities are very rare, however. C They're not complicated, but it needs a lot of practice to recall them in detail D A good diet containing 'brain food' like oily fish, walnuts and green tea is very beneficial, as is regular exercise, which increases blood flow to the brain E It needs regular exercise and new challenges to stay strong F For example, if you needed to buy celery, herbs, apples, rice and muesli, you might use the acronym CHARM.