How to Improve Memory by Following a Nutritious and Healthy Diet

Wild salmon contains omega-3 fatty acids and vitamin D, both of which may improve memory.
Wild salmon contains omega-3 fatty acids and vitamin D, both of which may improve memory. | Source

Memory loss is a worrying or even frightening situation, but it doesn't necessarily mean that a person is suffering from dementia or Alzheimer's disease. There are many causes of memory loss, including following a diet that lacks essential nutrients and eating harmful foods. There are also some great ways to boost memory. One of these is eating a healthy diet containing specific foods and nutrients.

Anyone that has noticeable memory loss should visit a doctor. Following a healthy diet and lifestyle can often be a big help in improving memory and in reducing memory loss, however. Nutritious foods, regular physical and mental exercise, getting sufficient sleep and avoiding unhealthy habits such as smoking and excessive alcohol consumption can all be beneficial.

Egg white contains vitamin B12, egg yolk contains vitamin D and strawberries contain anthocyanins. All of these substances are beneficial for memory.
Egg white contains vitamin B12, egg yolk contains vitamin D and strawberries contain anthocyanins. All of these substances are beneficial for memory. | Source

Vitamins B12 and B6, Folate and Memory Loss

A vitamin B12 deficiency can interfere with nerve function and cause confusion and memory loss that resemble Alzheimer’s disease. A person with serious memory loss should be under the care of a doctor, but the doctor may discover that the solution to the patient’s problem is to take vitamin B12 supplements.

Older people (those over sixty years of age) are most like to develop a low vitamin B12 level in their bodies. In order to be absorbed through the lining of the small intestine, vitamin B12 must first be separated from food. The stomach must be sufficiently acidic for this separation to happen. Older people may have low stomach acid, which hinders the extraction of vitamin B12 from food. Once the vitamin is removed from the food, it must bind with intrinsic factor, a substance made by the stomach lining, in order to be absorbed. Older people may not make enough intrinsic factor.

Inadequate vitamin B12 absorption can lead to other problems, such as anemia. If a person's diet contains insufficient amounts of vitamin B12, folate (or folic acid) and vitamin B6, a substance called homocysteine may build up in the body. Homocysteine has been shown to impair memory. It also raises the risk of a heart attack or stroke.

Kale is a good source of folate and other nutrients.
Kale is a good source of folate and other nutrients. | Source

Vitamin B12 in Food and Supplements

In supplements, vitamin B12 is not attached to food and is therefore unaffected by insufficient stomach acid. If a large enough dose of vitamin B12 is taken, some can be absorbed even without intrinsic factor. A person shouldn't take massive doses of the vitamin without a doctor’s advice, however.

A doctor may choose to give vitamin B12 shots or may prescribe sublingual vitamin B12 tablets. These tablets are placed under the tongue. As the tablet dissolves, some of the vitamin can be absorbed through the lining of the mouth, bypassing the digestive tract.

Boosting the intake of vitamin B12 from the diet may also be helpful. Only foods from animals contains the vitamin. These foods include meats, fish, dairy products and eggs. Vegans eat no food from animal sources. However, lots of vegan foods are fortified with vitamin B12. These include many non-dairy milks, vegan meat substitutes and fortified cereals. It's not a good idea to eat massive amounts of one type of food in order to obtain a particular nutrient, though. A diet needs to be balanced.

Bacteria are used to produce the vitamin B12 in supplements and fortified foods. Some of the bacteria living in our large intestine make vitamin B12, too, but it's unclear how much of this nutrient we absorb. Most vitamin absorption takes place in the small intestine.

Correcting a vitamin B12, vitamin B6 or folate deficiency may solve a memory problem. There is no evidence that supplements containing these vitamins improve memory in people who already have adequate levels of each nutrient, however.

Food Sources of Folate (Folic Acid) and Vitamin B6

Leafy green vegetables are a good source of folate, which is a member of the vitamin B family. Synthetic folate is sold as folic acid. All of the B vitamins dissolve in water. Foods containing B vitamins shouldn't be cooked by a method that involves a lot of water, such as boiling, since some of the nutrients will be lost.

Vitamin B6 is present in a wide variety of foods. These include meat, beans, cereals, fruits such as bananas, avocados and prunes (or dried plums) and vegetables such as potatoes and sweet potatoes that still have their skin.

Some Memory-Boosting Foods

Vitamin D Deficiency and Memory Problems

Vitamin D is very important for cognitive functions such as thinking, reasoning and remembering. The vitamin is made by our skin when ultraviolet light strikes it. However, due to the valid concern about getting cancer from the sun’s rays, many people are wearing sunscreen on sunny days and are therefore making an inadequate amount of vitamin D. People living at higher latitudes may have a problem with obtaining vitamin D in winter. At this time of year sunlight is too weak to stimulate much vitamin D formation. In addition, older people and people who cover their skin due to religious beliefs often make an insufficient amount of vitamin D.

The skin makes vitamin D when ultraviolet light from the sun strikes it.
The skin makes vitamin D when ultraviolet light from the sun strikes it. | Source

Vitamin D in Food and Supplements

Health experts are increasingly recommending that we take a vitamin D supplement. The vitamin seems to be very important in many body processes in addition to memory and is not present at high levels in most foods. One type of food that does contain significant quantities of the vitamin is oily fish. Salmon and sardines are example of oily and healthy fish. Eggs yolks also contain vitamin D. The vitamin is added to dairy milk. Mushrooms contain a fungal form of vitamin D.

There are two types of vitamin D in food. Cholecalciferol or vitamin D3 is found in animals and is also made by the human skin. Ergosterol is made by fungi and is found in their cell membranes. It's changed into ergocalciferol, or vitamin D2, by ultraviolet light. This process happens naturally. In order to increase the level of vitamin D2 produced by fungi, however, supplement manufacturers irradiate the fungi.

Both vitamin D3 and Vitamin D2 can be used by the human body and both are found in supplements and fortified foods. Vitamin D3 seems to be more potent, though.

A Dietitian Talks about Food and Memory

Potential Problems with Vitamin Supplements

There are some important points to keep in mind when taking Vitamin D supplements. Vitamins are classified as either water soluble or fat soluble. Vitamin C and members of the vitamin B family are water soluble. If these nutrients become too concentrated inside the body, the excess vitamins are excreted in the urine. Vitamins A, D, E and K are fat soluble. If these vitamins become too concentrated, excess amounts are stored in body fat and could be dangerous.

Another problem with supplementation is that vitamins don't act on their own in the body. They require the help of other nutrients These helper nutrients are often present in food but may be lacking in supplements.

For these reasons, taking megadoses of vitamins isn't recommended unless prescribed by a doctor to treat a diagnosed nutrient deficiency.

Phytochemicals or Phytonutrients for Memory

Benefits of Berries, Fruits and Vegetables

Researchers are discovering that in addition to their other benefits, plants contain beneficial compounds called phytochemicals or phytonutrients. These chemicals aren't necessary to keep us alive but have important health benefits. Some phytochemicals seem to help memory.

There is evidence that blueberries are useful for boosting memory. The beneficial phytochemicals in the berries are believed to be their anthocyanins. Anthocyanins are red, purple or blue pigments in plants. Other foods containing anthocyanins include berries, cherries, dark colored grapes, plums, red apples with skin, red cabbage, beets and red onions.

Foods containing quercetin may also be beneficial for memory. Quercetin is found in onions, apples, blackcurrants, many berries, apples, broccoli, cherries and dark grapes.

Anthocyanins and quercetin are members of the flavonoid family of plant chemicals, which seems to offer many benefits for humans. It's a good idea to eat flavonoids even if we don't have memory problems.

Nutritional terms can sometimes be confusing. Flavonoids are a family of chemicals made by plants. Anthocyanins and flavonols are smaller groups within the flavonoid family. Quercetin is a type of flavonol.

Berries can boost memory.
Berries can boost memory. | Source

Cruciferous Vegetables and Memory

Research has shown that people who regularly eat cruciferous vegetables maintain their memory better as they age compared to people who don't eat the vegetables.

Cruciferous vegetables belong to the family known as the Brassicaceae. Familiar vegetables in this family include broccoli, cabbage, brussels sprouts, cauliflower and kale. They contain folate, but cruciferous vegetables seem to be more beneficial for memory than other folate-containing vegetables.

Cruciferous vegetables are interesting plants. In addition to folate, they contain chemicals called glucosinolates. These may reduce the risk of some types of cancer. It's definitely worth incorporating the vegetables into a diet.

Brussels sprouts and other cruciferous vegetables are good for memory and health.
Brussels sprouts and other cruciferous vegetables are good for memory and health. | Source

Tumeric and Curcumin

Another valuable nutrient for memory is curcumin, which is a chemical present in turmeric. This yellow spice is used in curry and deserves a regular place in a diet. The brains of people with Alzheimer’s disease contain deposits called plaques. These plaques are made of a protein called beta-amyloid. Curcumin has been found to reduce the level of beta-amyloid in the brain and also to reduce inflammation. Curcumin is even more effective at reducing inflammation when used with vitamin D.

The subject of curcumin and its potential health benefits is related to an important topic in nutrition science. Just because we eat a nutrient doesn't necessarily mean that it will get to where it's needed in the body. First, the nutrient must be absorbed through the lining of the small intestine into the bloodstream. Secondly, it must stay intact long enough to do its job, or the active product of its metabolism must stay intact. If these requirements aren't met, the nutrient won't help us. The term "bioavailability" refers to the amount of a nutrient that is able to have an effect in the body.

Curcumin on its own has low bioavailability. Eating turmeric or curcumin with a fat (preferably a healthy oil) increases the bioavailability of curcumin. This is true for fat soluble vitamins, too. Eating curcumin with black pepper or a substance called piperine in black pepper also increases its bioavailability. Some people find that black pepper irritates their stomach, however.

Turmeric root is ground to make a spice.
Turmeric root is ground to make a spice. | Source

Omega-3 Fatty Acids, DHA and Memory

A high fat diet should be avoided, but including some fat in the diet is important. The fat that is eaten should include monounsaturated oils, such as extra virgin olive oil (unheated) and a type of polyunsaturated fat known as omega-3.

The specific omega-3 fat that has been shown to improve memory is called docosahexaenoic acid, or DHA. It’s found in oily fish such as sardines, wild salmon and mackerel. DHA is an important nutrient for the developing brain in a fetus and also reduces inflammation in the body.

Plant foods don't contain DHA. They do contain other forms of omega-3 fatty acids, which can be converted into DHA. This conversion process doesn't seem to be very efficient, however. Luckily, algal supplements containing DHA are now available. These could be helpful for vegans, vegetarians or other people who don't want to eat fish.

Sardine, grapefruit and fennel salad; sardines contain omega-3 fatty acids and vitamin D.
Sardine, grapefruit and fennel salad; sardines contain omega-3 fatty acids and vitamin D. | Source

Foods That Harm Memory

A high fat diet and weight gain have been shown to impair memory, especially in post-menopausal women. High blood cholesterol and high blood pressure also damage memory and often accompany weight gain. Even without these additional health problems, weight gain is detrimental to memory.

Excessive alcohol use also impairs memory. Alcohol kills brain cells. It interferes with short-term memories and prevents them from being converted into long-term memories.

Eating lots of high fat foods can hinder memory.
Eating lots of high fat foods can hinder memory. | Source

Other Factors That Affect Memory

Some non-dietary factors are known to improve memory. One of these is obtaining regular exercise, which has been show to significantly reduce the risk of dementia and Alzheimer’s disease. Avoiding smoking is important, too, since smoking harms memory by decreasing blood flow and oxygen supply to the brain. Mental exercise may help our ability to remember. Research suggests that we need to challenge our brain, especially as we age. Learning new things and solving reasonably difficult puzzles are two ways to do this.

Regular exercise such as walking or hiking can be beneficial for our memory.
Regular exercise such as walking or hiking can be beneficial for our memory. | Source

Memory is a complex phenomenon and isn't completely understood. It does seem to become harder for the brain to memorize as we age, but this should never be accepted or assumed to be normal. Anything other than very minor memory problems should be investigated by a doctor. Everyone can benefit from a healthy lifestyle, however, whether or not they are under the care of a doctor. This lifestyle has many health benefits beyond the possible correction of memory problems.

There are probably many undiscovered dietary factors that affect our ability to remember things. The best steps that we can take to improve or preserve memory are to eat a nutritious diet, exercise regularly, get enough good-quality sleep and avoid foods and habits known to cause memory loss. Making sure that we eat nutrients that may improve our memory or reduce memory loss also seems like a good idea.

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fundamentallife profile image

fundamentallife 5 years ago

I am going to get some blue berries this morning, thanks for great info.


AliciaC profile image

AliciaC 5 years ago from British Columbia, Canada Author

Thanks for the comment, fundamentallife. I make blueberries a regular part of my diet and make sure that my father, who’s eighty three, eats them too.

europewalker profile image

europewalker 5 years ago

Very informative hub. My mom passed away earlier this year. She Had alzheimers. Everytime I forget something, I think I am heading down that same road. I need to start eating some of the foods you mentioned.

AliciaC profile image

AliciaC 5 years ago from British Columbia, Canada Author

I’m sorry about your mom’s disease and death, europewalker. I have an aunt that suffers from dementia. Disorders like this really do make us think about ways to protect memory.

adrienne2 profile image

adrienne2 4 years ago from Atlanta

Alicia, Very easy to follow your style of writing here. Really enjoyed your hub on improved memory, for me it was a reminder, and brush up course to get my B12, which I have slacked up on of late. Voted up, and thank you.

AliciaC profile image

AliciaC 4 years ago from British Columbia, Canada Author

Thanks a lot for the comment and the vote, adrienne2. It's so sad when memory starts to fail. I'm making sure that my family and I are eating good food and nutrients to help maintain our ability to remember, too!

Manoj Kumar sirsa profile image

Manoj Kumar sirsa 4 years ago from Greater Noida

thanks for your suggestion

AliciaC profile image

AliciaC 4 years ago from British Columbia, Canada Author

Thanks for the visit and the comment, Manoj.

pringoooals profile image

pringoooals 4 years ago from Edinburgh

Alicia, Thank you for very useful advice. To be honest I was looking for something like it. Sometimes it is hard for me to remember some things maybe because I'm to focused on my inner world:) It's really good to know how to keep the mind fit. Voted up!

AliciaC profile image

AliciaC 4 years ago from British Columbia, Canada Author

Thanks for the comment and the vote, pringoooals. I'm very glad that you find the advice useful!

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    Linda Crampton (AliciaC)1,244 Followers
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    Linda Crampton is a teacher with an honours degree in biology. She enjoys exploring nutrition as well as the culture and history of food.

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