There hasn't been a medically proven or magical Elixir that can prevent Dementia or Alzheimer’s disease completely, but the diet we take play a great role in the brain's health likewise genetics and exercise. There are certain nutrients that can help improve memory and/or cognitive function, so keeping your diet full of such nutrients can help protect your brain.

MAGNESIUM

Scientists believe that a magnesium deficiency may play a role in cognitive decline, brain aging, and ultimately, dementia. So taking magnesium supplements — or eating foods that contain magnesium, like chard, spinach, pumpkin seeds, yogurt, almonds, black beans, avocados, figs, dark chocolate, or bananas — can help you fight off the effects of the aging brain.

BLUEBERRIES

Blueberries are delicious, but they also help in boosting your memory. Blueberries were shown to have antioxidant and anti-inflammatory effects. They also contain anthocyanins, compounds that are associated with increased neuronal signaling in the brain’s memory areas. Researchers found that participants who drank wild blueberry juice on a daily basis had improvements in paired associate learning and word list recall; they also found lower depressive symptoms and glucose levels.

CRUCIFEROUS VEGETABLES

According to the National Institute on Aging , eating a lot of fruits, vegetables, and whole grains can help stave off cognitive decline as well as other chronic diseases, like heart disease and type 2 diabetes. Green, leafy, cruciferous vegetables in particular (like broccoli and spinach) have been shown to reduce the rate of cognitive decline. The Mediterranean diet, in particular (vegetables, legumes, fruits, cereals, fish, olive oil, mild amounts of alcohol — as well as low consumption of saturated fats, dairy, meat, and poultry) has shown in studies to be beneficial for cognitive health compared to more “Western” diets that are high in fats, carbs, and meat.

GREEN TEA

Green tea is good for a lot of things — but it’s also going to help you protect your brain. Researchers found that green tea extract enhances your thinking process and working memory. Participants scored higher for working memory tasks after they received the green tea extract, and an MRI showed a boost in connectivity between the parietal and frontal cortex of the brain, meaning that green tea might increase the short-term synaptic plasticity of the brain

OMEGA-3 FATTY ACIDS

Fish that are rich in omega-3 fatty acids, like salmon, mackerel, and tuna, are going to not only help your heart health, but they’ll also give you a boost in brainpower. According to a 2014 study , mice that were given supplements of omega-3 polyunsaturated fatty acid showed improved cognitive function while they aged — showing better object recognition memory, spatial and localized memory, and aversive response retention.

NUTS

Nuts contain omega-3 fatty acids like fish, so adding nuts to your diet in addition to fish will provide you with solid amounts. Walnuts , in particular, have been shown to fight memory loss. In one recent large-scale analysis, researchers found that a diet supplemented with walnuts — which are high in omega-3 fatty acids, vitamin E, folate, antioxidants, and melatonin — improved adults’ performances on a series of six cognitive tests.