The brain is best fuelled by a steady supply of glucose

Beans on toast is a far better combination,

Eggs are rich in choline, which your body uses to produce the neurotransmitter acetylcholine.

A salad packed full of antioxidants, including beta-carotene and vitamins C and E, should also help keep an ageing brain in tip-top condition by helping to mop up damaging free radicals.

yogurt contains the amino acid tyrosine, needed for the production of the neurotransmitters dopamine and noradrenalin,

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.

Finally, you could do worse than finish off your evening meal with strawberries and blueberries.