Attentiveness and ability to instantly concentrate on performing complex tasks depends on the set of factors. Partly in genetics. But if you are not so careful if you want, I would not want to despair. A lot depends on what we eat and what lifestyle we have.
In particular, the nutrition plays a major role in ensuring the proper work of the brain. For example, the normal functioning of the brain structures is impossible without the presence of fats in the diet. Moreover, it must be no fatty pork, and fish of fatty varieties and seafood, rich omega-3. This substance is rich in antioxidants.
No less useful avocado and coconut oil. These products slow down the aging processes in the brain and help the nerve impulses through the neural network.
Those who want their brain to be in excellent condition should also regularly use mushrooms, turmeric and drinking coffee from time to time.
Do not forget that the brain can also be trained as the muscles of the body. For this, intelligent games on the phone and computer, crosswords, sudoku and puzzle are useful. The optimal time of classes is 15 minutes.