What sweets are useful to a brain and allow it to work better

At a human brain the unique structure containing neurons and glias. On glias active cages the neurons consisting of a cell membrane and shoots on which there is a transfer of nervous impulses also keep. The brain consumes 30% of oxygen, because exchange processes in it too intensive. Brain of people at whom brainwork, consumes to 50% of oxygen. That the brain continuously received energy, it needs to be "fed" with glucose. It can be received from a slice of sugar, a chocolate, a pie, or even from porridge. But, sweets — a source of pure glucose, while, for example, that...