First, go to the top of the class by eating breakfast. The brain is best fuelled by a steady supply of glucose, and many studies have shown that skipping breakfast reduces people's performance at school and at work.
Brains are around 60 per cent fat, so if trans-fats clog up the system, what should you eat to keep it well oiled? Evidence is mounting in favour of omega-3 fatty acids, in particular docosahexaenoic acid or DHA. In other words, your granny was right: fish is the best brain food. Not only will it feed and lubricate a developing brain, DHA also seems to help stave off dementia. Studies published last year reveal that older mice from a strain genetically altered to develop Alzheimer's had 70 per cent less of the amyloid plaques associated with the disease when fed on a high-DHA diet.
Who doesn't want a better, longer-lasting, brain? Personally, I just don't want to go senile. If I can go the whole rest of my life without forgetting to put on pants, i'll be happy.