In addition to a good set of genes, the long and healthy lives of the Okinawa people is attributed to consumption of locally grown vegetables and huge quantities of tofu and seaweed. Before the advent of modernisation, their diet was lean in calories, low in sugar and fat and devoid of processed or canned food.
This advantage was lost when they emigrated elsewhere or changed to a more modern lifestyle and eating habits, as practiced by the younger generations.
A similar dietary pattern is found in the exceptionally healthy and long-lived Abkhazians in Central Russia, the Vilcabambans in Ecuador, and the Hunzans in Pakistan.
Their diet is low in calories with fresh food which came from natural sources such as whole grains, vegetables, and fruits. Conversely, it is low in fat (in fact devoid of animal fats). There are no processed foods, sugar, preservatives, artificial flavours, or other chemicals.
It has been found that the modern “Western” diet has a higher proportion of omega-6 compared to omega-3 fatty acids (at around 15:1) compared to that of our ancestors, whose intake was probably in a 1:1 ratio.
Omega-3 fatty acids contained in fish, game and vegetables have been largely replaced by omega-6 fatty acids of cereal oils.
This is believed to contribute to diseases of ageing. A ratio of about 3:1 is associated with lower risk of degenerative diseases.
A study at Tufts University in Boston showed that people who ate the most fish (equivalent to three servings of oily fish per week) were nearly 50% less likely to develop dementia.
These people had higher levels of docosahexaenoic acid (DHA), the so-called “heart-healthy” omega-3 fatty acid. Higher consumption of omega-3 fatty acids is, of course, also good for heart health.
It is not known if omega-3 supplements are needed if an appropriate omega fatty acid ratio is maintained through sensible eating.
In sum, a brain healthy diet is nutritionally balanced, low in calories, fat and sugar; ideally fresh, with minimal processing; and has a favourable omega fatty acid composition.
Avoid head injury
The brain is a soft structure contained within the skull. It is easily damaged from direct and indirect impacts. Quite a number of human activities expose the brain to physical injury. Road traffic accidents, extreme sports and dangerous work may all cause the loss of valuable brain cells.
In fact, the American Association of Neurological Surgeons has debated whether to call for a ban on boxing as a sport. Do take reasonable care and wear protective head-gear to avoid injury in your daily activities.
Zero tolerance for ingested toxinsA great number of chemical and organic substances may poison our brain cells. Every day, people consume toxins without paying much attention to the consequences. The principal neuro toxins around us are alcohol and tobacco smoke. A recent European study confirmed that smoking speeds up brain decline in the elderly by a factor of five times. It was thought that smoking accelerates atherosclerosis and contributes to high blood pressure, stroke and small artery blockage in the brain.
Keep our environment safeChildren can suffer brain damage from being exposed to chemicals, such as very low levels of lead. Even adults may suffer from environmental toxins.
There have been tragic incidents of environmental neurotoxins causing epidemics of brain diseases. In Minamata, Japan, mercury poisoning was due to environmental contamination.
On the other hand, a freak accident of nature in the Chamorro Islands resulted in an epidemic of muscular weakness, parkinsonism and dementia in young people, which was eventually traced to poisoning through seeds of the cycad plant (the amyotrophic lateral sclerosis-parkinsonism-dementia complex of Guam).
As a concerned citizen, support initiatives to minimise pollution.Brain maintenance – neuroprotective foodsThe brain needs help with the removal of damaging products of its metabolism. The free radical concept of ageing holds that free radicals, (charged oxygen molecules) which are produced in the body’s metabolism of oxygen, cause the oxidation of lipids, protein and nucleic acids, a process termed oxidative stress.
Antioxidants help to protect against the effects of free radical damage. Sources of antioxidants are foods rich in vitamin C and vitamin E. A group of compounds called flavonoids have been reported to protect against brain ageing by acting as an antioxidant and reducing inflammation.
Returning to the Okinawan story, the native diet is high in flavonoid content. Foods which are rich in flavonoids are red grapes, red wine, chocolate, cocoa, white onions, ginger, garlic, turmeric, and tea (both green and black varieties).
A comprehensive list is available from the US Department of Agriculture at http://
www.ars.usda.gov/nutrientdata/flavonoid.
What about supplements?
It is now quite common for supplements to be taken in the hope of promoting healthy ageing. However, there is as yet no definitive proof of benefit from any agent, including gingko biloba, ginseng, folic acid, or Coenzyme Q10.
The same goes for drugs such as statins, aspirin, non-steroidal anti-inflammatory agents and hormone replacement therapy. Research is ongoing to identify nootropics, drugs which can maintain brain function.
A healthy mind in a healthy body
For the brain to function optimally, the body as a whole needs to be in good health.
Absence of high blood pressure, diabetes, obesity and heart disease will contribute to brain health. General good health goes a long way to preserve mental agility.
Quite apart from promoting heart and lung function, recent studies suggest that physical activity in early and mid-adult life can help prevent dementia. Exercise is associated with increase in levels of brain-derived neurotrophic factor (BDNF) which enhances brain function, as well as reduced build-up of beta-amyloid, the abnormal protein which accumulates in Alzheimer’s disease.
In this regard, aerobic exercise appears to more beneficial than anaerobic exercise. This is yet another incentive to keep physically active.
An active mind is a healthy mindExercise your mind with mental activities and problem solving. The more the mind is exercised through mental tasks, the more likely it is to stay nimble. This is most pleasurably done by staying engaged with life.
When you retire from work, do not retire from life! Being productive gives a sense of self-worth and well-being. Emotionally sustaining social networks such as family and friends keep the elderly active and make them feel valued.
Stay happy. Stress and depression during adult life has been found to be a risk factor for future development of dementia.
Finally, a February report announced that coffee drinking slows cognitive decline. So stay active and happy with friends at your neighbourhood warung kopi or other suitable coffee outlets.