What to Put on Your Plate Every Day to Protect Your Memory: A Specialist's Eight Foods, from Fish to Green Tea
As people age, the brain changes along with the body. Many accept fading memory, difficulty holding attention, or taking longer to recall familiar things as natural signs of growing old. But memory decline is not always an inevitable result of age. Diet, physical activity, sleep, mental health and various lifestyle habits all play an important role in keeping the brain healthy.
Dementia is now a major public health problem worldwide. It is not a single disease, but an umbrella of conditions in which memory, thinking, language, judgement and the ability to carry out daily tasks steadily decline. Alzheimer's disease is the best-known cause of dementia.
In Bangladesh, too, as average life expectancy rises and the elderly population grows, preventing dementia and protecting brain health are becoming ever more important. Diabetes, high blood pressure, obesity, physical inactivity and unhealthy eating habits can all harm the brain's long-term health.
Research shows that a significant share of dementia risk is linked to modifiable lifestyle and health factors. Yet no single food can guarantee prevention. Alongside a balanced diet, regular exercise, adequate sleep, social contact and control of blood pressure and blood glucose are essential. Professor Jeremy Spencer, a nutritional biochemistry specialist at the University of Reading in the United Kingdom, has highlighted eight types of food for brain health — and many of them are available in everyday markets in Bangladesh.
One: fish, an important source of omega-3 fatty acids for the brain. Bangladesh is a riverine country; fish is a central part of its food culture and a key source of animal protein. Its special value lies in omega-3 fatty acids, especially docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). DHA is an important component of the membranes of brain nerve cells and helps maintain their structure and normal function, while EPA takes part in physiological processes linked to controlling inflammation.
Hilsa, pangas, rui, katla, tilapia and various small fish are eaten regularly in Bangladesh, but the omega-3 content is not equal in all fish; hilsa is comparatively rich in it. Small fish such as mola, puti and kachki, eaten with their bones, provide calcium and other minerals, though not all of them should be considered high-DHA fish. Building a habit of eating fish at least two days a week is a practical step, and cooking in light curries or steamed, rather than deep-fried in excess oil, makes the diet healthier still.
Two: colourful fruits, a source of anthocyanins and antioxidants. Berry fruits such as blueberries, blackberries and strawberries have received special attention in brain-health research. They contain a type of flavonoid called anthocyanin, which gives fruit its red, blue and purple colours. Anthocyanins and other polyphenols can act as antioxidants and help maintain normal blood-vessel function, and some studies link flavonoid-rich diets with better memory and a lower risk of age-related cognitive decline.
Blueberries are generally expensive and not easily available in Bangladesh, but local options include jamun, black jamun, guava, amla, pomegranate and various seasonal fruits. Black jamun contains anthocyanins, while guava and amla are sources of vitamin C and plant antioxidants. It cannot be claimed, however, that all these local fruits have proven memory benefits at the same level as blueberries. Eating seasonal fruit daily matters, and eating whole fruit rather than sugary juice also provides dietary fibre.
Three: cocoa, a possible benefit for blood flow to the brain. Cocoa contains plant compounds called flavanols, which can positively affect blood-vessel function and circulation. Some human studies have found indications of benefit for vessel function and certain cognitive tests from consuming cocoa flavanols. But there is still no reliable evidence that regularly eating cocoa or chocolate can prevent Alzheimer's disease. Most milk chocolate on the market can be high in sugar and fat, so the idea that simply eating chocolate helps the brain is wrong; unsweetened cocoa powder can be taken in small amounts with milk, oats or other foods.
Four: eggs, an important source of choline and vitamin B12. Eggs are a comparatively accessible nutritious food in Bangladesh. Egg yolk contains choline, an important nutrient that plays a role in normal brain function; acetylcholine, a neurotransmitter linked to memory, learning and attention, is made from choline. Eggs also provide high-quality protein, vitamin B12, riboflavin, selenium and other nutrients. Some observational studies have found a positive association between eating eggs and cognitive health, but it is not conclusively proven that eggs directly reduce dementia risk — and discarding the yolk entirely can mean missing choline and several other important nutrients.
Five: red rice, wholemeal flour and oats — steady energy for the brain. The brain is one of the body's most energy-hungry organs, and glucose is its main fuel under normal conditions. But if blood glucose stays uncontrolled for a long time, it can harm blood vessels and the nervous system. Wholegrain foods such as red rice, wholemeal flour, oats and less-processed grains provide fibre, B vitamins and minerals. White rice is the staple in Bangladesh, and over-polishing removes part of the outer layer and germ, reducing fibre and some vitamins and minerals. Studies link wholegrain consumption with lower risk of heart disease, type-2 diabetes and, in some cases, cognitive decline — but red rice or oats alone will not prevent dementia, and for people with diabetes, total quantity and glucose control matter alongside the type of rice.
Six: green leafy vegetables, a source of folate, nitrates and antioxidants. Spinach, red amaranth, jute spinach, water spinach, stem amaranth and various seasonal greens are easily available in Bangladesh. They contain folate, vitamin K, carotenoids, fibre and minerals, and some contain natural nitrates, from which the body's nitric-oxide process can support vessel dilation and normal blood flow. Some observational studies of older people link regular green-leafy-vegetable consumption with comparatively slower cognitive decline. Boiling greens for a long time and throwing away the water can destroy water-soluble vitamins and minerals, so washing them well and cooking in little water is better; including at least one kind of green in the daily meal is a simple habit to adopt.
Seven: lentils and chickpeas, and the important relationship between the gut and the brain. Masoor, mung, urad, chickpeas and various beans are common in Bangladesh. They provide plant protein, fibre, folate and complex carbohydrates. Part of their fibre and resistant starch reaches the large intestine, where beneficial gut bacteria ferment it, producing short-chain fatty acids such as acetate, propionate and butyrate, which may play a role in gut health, inflammation control and gut-brain communication. Even so, the evidence is not yet sufficient to conclude that eating lentils directly prevents dementia. A moderate daily portion of lentils is easy and affordable, and a meal combining rice, lentils, greens and fish can be nutritionally balanced.
Eight: green tea and ordinary tea, a source of polyphenols and L-theanine. Tea is one of Bangladesh's most popular drinks; milk tea is the norm, but the use of green tea is also growing. Tea contains polyphenols including catechins, and green tea in particular features a compound called epigallocatechin gallate (EGCG) that draws researchers' interest. Taken together, the specialist's message is simple: no single food, but rather a varied balanced diet, regular physical activity, adequate sleep, and controlled blood pressure and glucose, is the most reliable path to holding on to memory.
