Brain is the most complex organ of the human body, so it's essential that we take great care of it for long term brain health. This requires proper nutrition for healthy functioning just like is the case for the heart and other organs. Here are the 7 best foods for your brain that can help you in keeping your brain functioning optimally for a long time.

Nuts: Vitamin E is one of the major nutrients required by the brain as it protects your brain from free radical damage which is associated with memory loss with old age. Vitamin E even delays progression of Alzheimer's disease. Nuts are not only a good source of vitamin E, they even have high magnesium content, which delays age-related memory loss.

Fish: Omega-3 fatty acids are major nutrients that manage the oxidative stress in older people with mild cognitive decline. Fish and fish oil are rich sources of omega-3 fatty acid.

Dark Green Leafy Vegetable: These vegetables are filled with magnesium and folate. Getting adequate folate makes you more alert and it also improves your memory and focus. It helps in lowering blood levels of the amino acid homocysteine that is known to damage brain cells. Also, Magnesium delays age-related memory loss.

Berries: Research suggests that flavonoids in berries may cut your risk for Parkinson’s disease because of their anti-inflammatory powers. Berries also help in protecting the brain from oxidative stress and may reduce the effects of age-related conditions such as Alzheimer's disease or dementia.

Whole Grains: Whole grains like oatmeal or brown rice are rich sources of dietary fiber which reduce inflammation, oxidative stress, and other vascular risk factors such as high blood pressure - all of which might affect the brain.

Dark Chocolate: Dark chocolate is rich in powerful antioxidant properties. It also contains several natural stimulants including caffeine, which enhance focus and concentration and stimulates the production of endorphins which helps in improving your mood. However, in spite of these benefits, it is also high in calories, so its advisable to consume them in moderation.

Oils: Olive oil, nuts oils, fish oils, flaxseed oil, etc. contain heart-healthy mono-unsaturated omega-3 and omega-9 fats. These fatty acids and polyphenols help to reduce inflammation in your joints and cells. Oils are also a rich source of vitamin E which protects neurons or nerve cells.

Include these foods in your diet to makes your more alert, increases immunity to fight age related brain diseases and helps in improving your focus and concentration.