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Nuts contain protein, high amounts of fiber, and they are rich in beneficial fats. They also contain plenty of vitamin B, E, and magnesium which are essential to cognitive function.  They can clear up that brain fog and enable you to think more clearly and are positive mood enhancers. Filberts, hazelnuts, cashews, and walnuts are great choices, with almonds being the king of nuts.
For those avoiding carbohydrates, macadamia nuts are much higher in fat than most nuts. Peanuts are not a good choice as many people are allergic to peanuts and they have less healthy fat than many other types of nuts.
Try seeds like sunflower seeds, sesame seeds, flax seeds, and tahini (a tangy, nutty sesame butter that tastes great in replacement of mayo and salad dressing). Seeds contain a lot of protein, beneficial fat, and vitamin E, as well as stress-fighting antioxidants and important brain-boosting minerals like magnesium.
Seeds boost your mood and brainpower. Sunflower seeds contain tryptophan, an important amino acid that the brain converts to serotonin, which is a natural way to relieve mild depression and insomnia.  Additionally, sunflower seeds are high in thiamine, an important B vitamin, which increases memory and cognitive function.
Eggs are a precious source of high-quality proteins and rich in vitamins and minerals. The selenium in organic eggs is proven to help boost your mood. A nutrient called choline, found in eggs, can help boost the memory center in the brain.  Choline increases the size of neurons, which helps them fire electrical signals more strongly and rebound faster between firings.
Two antioxidants found in egg yolk, called lutein and zeaxanthin, help prevent the risk of age-related cataracts and macular degeneration, two of the most prevalent age-related eye conditions.
Berries contain antioxidants that help boost cognition, coordination, and memory.  Blueberries are high in fiber and low on the glycemic index, thus they are safe for diabetics and they do not spike blood sugar. Blueberries are possibly the best brain food on earth as they boost the potency of neuron signals. They are also known as the "brain berry", and are considered a super food when eaten in their natural form. They are also known to protect the brain from oxidative stress and may reduce the effects of age-related conditions such as Alzheimer’s disease and dementia.
Antioxidant-rich strawberries can prevent age-related neurological declines by improving brain cell abilities to send and receive the ’signaling’ molecules. The brain uses these signaling molecules to communicate. Blackberries are rich in nutrients called anthocyanins that help protect our brain from oxidation stress, which in turn fights degenerative brain diseases.
Pomegranates contain blueberry-like levels of antioxidants, offering brain and memory protection. It carries a lot of vitamin C, A and E, as well as fiber, iron and potassium and anti-inflammatory attributes help in strengthening the immune system. Studies prove that pomegranate juice helps memory and FMRI activity in middle-aged and older adults with mild memory complaints. 
Coffee is good for your brain. You can safely enjoy 2 cups daily. Coffee is rich in antioxidants, amino acids, vitamins, and minerals. Recent findings show it to be one of the best brain foods, reducing the risks of mental decline including diseases like dementia and Alzheimer's.
Green tea enhances memory and focus and fights mental fatigue. It contains catechines, which help you relax mentally and maintain your focus as well.
Green tea also helps maintain positive mood states and fights against many brain disorders. Polyphenols are powerful antioxidants found in green tea that can boost the availability of the important signaling brain substance dopamine in brain circuits. A study also proved that green tea extract 'boosts mental ability' in people with Down's syndrome. 
Whole grains like brown rice are essential for maintaining concentration throughout the day and improving memory. That's because they contain the perfect mix of carbohydrates and fiber to fuel your brain while keeping you full. The low-glycemic complex carbohydrate present in brown rice is excellent for people sensitive to gluten who still want to maintain cardiovascular health.  Wholegrain breads and cereals are also rich in folate and Vitamin B6, important brain vitamins.
Dark chocolate has brain-boosting compounds; it’s rich in antioxidants and contains several natural stimulants that increase the production of endorphins while enhancing focus and concentration. It also releases dopamine, to enhance cognition and mood. It is also rich in fiber. It has a high content of flavonol epicatechin that facilitates blood supply to the brain and enhances cognitive skills.
Milk chocolate jump starts impulse control and reaction time. It has also been known to improve visual and verbal memory.
Garlic is one of the most potent nutritious foods. It is fabulous for reducing bad cholesterol and strengthening your cardiovascular system, and it exerts a protective antioxidant effect on the brain. It can potentially help against stroke, dementia and Alzheimer’s disease. 
Green Leafy Vegetables
Spinach, kale, chard, romaine, arugula, lolla rossa and other green vegetables should be consumed on a daily basis. These vegetables are high in iron (slightly less "green" iron sources include beef, pork, and lamb). Folate and vitamin B6, found in broccoli and kale, help convert tryptophan into serotonin, a brain chemical that boosts mood alertness. 
Tomatoes are a fantastic brain food as their high content of lycopene makes them an ideal source of unique of antioxidants. Lycopene is particularly good for the brain — it helps protect against free-radical damage to cells, which prevents the brain from aging and is believed to be a primary factor in cases of dementia, and particularly, Alzheimer’s disease.
Broccoli is a super food with high overall nutrient content. High levels of chemicals called homocysteines are linked with cognitive decline and Alzheimer's disease. In order to break themselves down, homocysteines require folate and B12 or B6, vitamins found in vegetables like broccoli. It is a great source of vitamin K, which enhances cognitive function and improves brainpower.
Vitamins B6, B12, and folic acid are essential in protecting your memory. Whole-grain foods, such as whole-grain bread and wheat germ are part of the best brain foods. Whole grain bread, cereals, barley, popcorn boost blood flow to the brain.
Wild SalmonHigher levels of omega-3 fatty acids in the blood go hand in hand with higher levels of serotonin, a mood-enhancing brain chemical. Thus, these fatty acids are responsible for improved cognition and alertness, reduced risk of degenerative mental disease (such as dementia), improved memory, improved mood, and reduced depression, anxiety and hyperactivity. Wild salmon is a premium source of these beneficial fats. Salmon is also rich in protein, calcium, and vitamins A, D, and B group. 
TunaIn addition to being another rich source of DHA (docosahexanoic acid), a type of omega-3s; tuna, particularly yellow fin, has the highest level of vitamin B6 of any food. Generally, the B vitamins are among the most important for balancing your mood. B6 in particular influences dopamine receptors, the "feel good" hormones along with serotonin.
A diet rich in healthy fats is essential to clear thinking, good memory, and a balanced mood. Extra virgin olive oil is rich in antioxidants for healthy brain function.  The extra virgin organic variety is best because the oil is produced naturally without chemical treatment. Raw unprocessed organic olive oil also contains fibers and proteins.
Avoid processed fats as eating the wrong fat can literally alter your brain’s communication pathways. Avoid processed fats as eating the wrong fat can literally alter your brain’s communication pathways.
Things That Drain Your Brain
There are some foods that will cause a brain drain and work against your efforts.
It is advised to stay away from foods with high-fructose corn syrup; sugary drinks, colas, and juices; refined white sugars; items with trans fats and partially-hydrogenated oils, and other processed foods. Alcohol and nicotine are also known to cause reduced brain function.
A High Carbohydrate Meal
A high carbohydrate lunch makes you feel sleepy and sluggish. It is advised to opt for a light meal with some quality protein, such as a salad with grilled chicken breast or vegetables and hummus or wild American shrimp and avocado.
Corn Syrup And Sugar
Corn syrup and sugar lead to health problems like diabetes and obesity and are terrible for your brain. Don’t eat sugar except on special occasions or as an infrequent treat. Sugary fruit drinks, colas, and juices are among the worst offenders.
Nicotine constricts blood flow to the brain, so while it may soothe jittery nerves, smoking can actually reduce your brain function severely and the effects are cumulative.
Alcohol interferes with dopamine production. Moderate amounts of alcohol, particularly resveratrol-rich red wine, can help improve your health, but any alcoholic drink beyond a glass or two of wine daily is a recipe for reduced brain function and energy loss.