Have you eaten healthily today?

Diets high in saturated fat increase the risk of dementia. It can impair your concentration and also affect your memory. So beware of foods that are made of animal products. Ice cream, whole milk red meat and butter, cheese and sour cream should be consumed in smaller amounts if necessary for your diet and fancy.
Omega 3's very important for brain health. Fish is a great source of omega 3's but I do know some folk who are not fond of fish- I suggest looking into fish oil supplements. Some of the nuts (walnuts) and some seeds also provide non-fish omega 3's. Eating plenty of fruits and vegetables as they are packed with antioxidants, especially colourful fruits and vegetables. If your diet permits eat green leafy vegetables.
Drink grape juice and also cranberry juice and fresh grapes and berries and peanuts...Be careful of carbohydrates such as sugar and white bread. Carbs can fuel your brain for a short boost and a rapid crash.
For energy that lasts, choose whole wheat bread,oatmeal and high fiber cereal, brown rice and  lentil/beans.
Good luck-I know that you will feel brain boosted if you follow some of these hints.