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Need for moving from geo-politics to geo-economics

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Speech made by Ajith Nivard Cabraal, State Minister of Money, Capital Markets and State Enterprise Reforms at the Trade and Investment Forum organised by the Pakistan High Commission on 24th February 2021.

Honourable Prime Minister Imran Khan, Honourable Prime Minister Mahinda Rajapaksa, Honourable Ministers, My dear friends.

First of all, I want to thank the organizers of this Pakistan-Sri Lanka Trade and Investment Conference for inviting the Sri Lankans to commit their cooperation to you. As your Foreign Minister just mentioned, I believe this Forum would offer great opportunities for our two countries to co-operate effectively, and I am eagerly looking forward to that. At the same time, I think it’s a privilege to be able to speak at a Forum where two Prime Ministers represent their country’s economic spheres, which is also a very rare occasion.

Honourable Prime Ministers, our two countries have come a long way since we gained independence: you, in 1947, and we, in 1948. Over the last 73 odd years, we have broken free from many shackles of Colonialism. We are finally beginning to “think big” of our respective economies and focus on the next era of our respective countries. I have listened to speeches of the Pakistan Prime Minister as well as that of our own Prime Minister, and have seen a common trait. That is, they both talk about bringing the poverty levels down and making sure that the fruits of development reach every section of the country’s people. Those are very important outcomes that we all need to be focusing on.

Honourable Prime Ministers, by 1992, within 45 years of being independent, Pakistan was able to win the Cricket World Cup under your current Prime Minister, by beating England. We in Sri Lanka were very happy to watch him play Cricket, but when he played against us, we were not so happy! Nevertheless, we have been regularly delighted with the exploits of the Cricket team of Pakistan. Perhaps as a result of their successes, we also took a cue, and by 1997, 49 years since our own independence, we beat Australia to become the World Cricket champions. Since you had already beaten England to become champions by then, the two countries which started Cricket (England and Australia) were both beaten by two countries of the subcontinent, which then showed the world that we can do it!

Unfortunately, however, we have not done so well in other areas, such as cooperation in trade and investment. As your Foreign Minister just mentioned, the targets that we have set for ourselves in this sphere seem to be quite low. We should not be looking at 300 or 400 million dollars of trade and investment. We should really be looking at a lot more, given the relationships that we have, the friendships that we enjoy, and the way in which we have cooperated with each other. We should be talking about trade and investment between ourselves in the billions of dollars. Let’s therefore see whether today could be the day where we start on that target. Hopefully, today we will find ways and means by which we can co-operate to achieve those goals.

Honourable Prime Ministers, we all know that there is a resource gap in our countries, and that such resource gap has to be filled with investment. In the Colonial times, many of those countries that reached high per capita incomes, didn’t fill the resource gap with investment. They took the dubious step to conquer other countries and forcibly grab resources. By doing so, they were able to reach the prosperity levels that they are at today. But our two countries have not done it that way. We have accessed resources and investment legally and honourably. We invited and received investments. We took loans. We traded in a fair manner. We played by the rules. That is how our countries have progressed and developed.

So, let’s see how we can do even better. In my view, to do that successfully, we have to make sure that we invest in each other’s countries. I was a former Governor of the Central Bank, and my experience tells me that we have been mainly investing in the West for too long. We have invested in those countries based on the “credit ratings” given by various Western credit rating agencies. Then, we get about a 1 per cent return. But, when those countries’ investors invest in our economies, we pay about 7 per cent as interest, due to our supposedly “poor credit rating”. Have you also ever wondered as to why when we lend money to the West, it is called an “investment”, but, when they lend money to us it is a called a “loan”? Not only that. In accordance with that strange arrangement, we suffer from an interest differential of around 6 per cent on our reciprocal investments. On that basis, if we have forex reserves of 10 billion dollars and our market borrowings are higher than that, we will have a 6 per cent up-front negative carry on our total reserves. That works out to about six hundred million dollars, which is a lot of money!

Against this background, I think we need to think as to how we can co-operate with each other and in particular, as to where we can invest in each other’s economies and countries. Your State Bank of Pakistan and our Central Bank of Sri Lanka should now be looking at ways and means by which we can co-operate in our respective forex investments. These are the big tickets that can make an impact in our cooperation. That’s a very important part where we can make a significant difference in the way we do business and investment between our two countries in the future. In addition, we must also promote trade within our private sectors.

My dear friends, Prime Minister Imran Khan made a fervent plea recently for a Post-Covid moratorium to provide some real financial support to the countries that need to deal with the fall-out of the pandemic. Sadly, it has not yet been favourably responded to, by the global financial community. Our President also made a similar plea a few months ago. But unlike what happened immediately after the tsunami, the world monetary authorities have been very slow in responding to these calls. If an year’s grace was given to the emerging nations for the forex payments that had to be made in that year to the multilateral institutions, it would have made a huge difference to those nations which have had to grapple with the sudden drop in their foreign receipts as a result of the pandemic. Let’s therefore agree to work together to achieve that kind of a global outcome, which is essential for the continued growth of our countries.

Honourable Prime Ministers, Pakistan is a 300-billion-dollar economy. We are an 80-billion dollar economy. In that context, I think if we can work out a scheme where our two countries have trade relationship of at least a billion dollars very soon. That would be a great outcome for both our countries.

Let’s also make our respective countries preferred destinations. Let’s make Pakistan a preferred destination from Sri Lanka, and Sri Lanka a preferred destination from Pakistan. Let’s visit each other’s countries frequently. Let’s play a little more cricket as well. Maybe some club teams, school teams, or over-50 cricket teams (I can also participate then!), women’s teams, can play each other. We can also have exchanges of students. We already have that happening. In fact, we have to be grateful to Pakistan for providing 1000 scholarships to our kids to study in their universities. Let’s make films together. Let’s organize exhibitions. Deepening our co-operation in various ways is essential if we are to make our relationship meaningful and profitable.

Honourable Prime Ministers, I welcome the Pakistan Foreign Minister’s suggestion that we should now move from geo-politics to geo-economics, and why not? I think that’s an excellent basis for future co-operation, when we are reshaping our respective economies. We must keep that in mind, because I think it would be an important factor when we push forward our own economies. In that regard, I must also proudly mention that Sri Lanka is today emerging from economic stagnation which dragged us down over the last five years. In fact, Sri Lanka has been able to go through the recent difficult period with the Covid pandemic, even while maintaining low interest rates and protecting the value of our Rupee.

Honourable Prime Ministers, going forward, a continuous pipeline of investments would be a priority for us in much the same way that it will be for you. So, come invest with us. In the same way, Sri Lankans could invest with you. We have the Port City which is an exciting value proposition. We have the Hambantota Industrial Zone. We would like you to consider making investments there too. I also know you have some great industries in Pakistan. You have the Pharma industry. In fact, I met some of them last night and had wonderful conversations. Let’s see whether we can develop some partnerships in that field, as well.

Let’s now promote a sustainable South-South dialogue and partnership. One of the best economists of our country in the 1980s, Dr. Gamani Corea who was the Secretary General of UNCTAD, was the man who first proposed the “South-South” cooperation. Unfortunately, that laudable concept didn’t get enough traction at that time, but today would be a good day for us to take that initiative forward. That would be a tribute to that great man as well.

Prime Minister Imran Khan, we deeply appreciate the time you have spent here in Sri Lanka and the fact that you have been the first visitor to Sri Lanka after the pandemic. We greatly value your visit and we hope that today’s event would be the fore-runner for a great partnership. You have been involved in great partnerships in the field of Cricket and I think you know very well about the value of good partnerships. Let’s hope that the great partnership we are starting today would be a truly winning partnership for both Sri Lanka and Pakistan.



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Proxy wars make unsettling comeback

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Russian armed forces in Ukraine

It’s the day of the North-East proxy war all over again. Concrete proof that this is so comes in the form of the latest military aid package approved for Ukraine by the Biden administration running into $60 billion. So substantial is this injection of assistance that it has prompted Ukrainian President Volodymyr Zelenskyy to see it as pointing to a “chance of victory”.

To the extent to which the West sees some of its best interests, such as the right to self- determination, being eroded in the Ukraine, to the same degree could the latter’s efforts to protect its independence against the Russian invasion be seen as a proxy war where the West pits itself indirectly against the East, in the form of Russia.

Only time will tell whether Zelenskyy is right in seeing the emergence of a “chance of Victory”, now that the much hoped for aid has arrived from the West, but increasingly sizeable and sophisticated arms for Ukraine foreshadow a further prolongation of the wasting war in the Ukraine. While the Russian armed forces would need to brace for an escalating and more destructive confrontation in the Ukraine, the civilians on both sides of the divide should see themselves as being placed ‘on the firing line’ as never before. Overall, the human costs of war would prove staggering.

To make matters far worse for the Russian side, the UK government too has weighed in with an aid package for Ukraine to the tune of Sterling Pounds 500 million, making the prospect of bringing early relief to the relevant suffering publics by the international community a very distant one, since the war in the Ukraine would be stepped-up several fold as a result of the influx of more arms.

It would not be irrelevant, at this juncture, to take the minds of Russia’s rulers to their Cold War failure in Afghanistan. There was nothing to gain from the long-running Afghan quagmire for both sides to the conflict. The USSR’s failed military intervention left behind an Afghanistan which has wilted in the grip of big power rivalries over the decades.

However, Afghanistan was the last of a number of Cold War era proxy wars which rendered the world an increasingly dangerous place for the majority of its peoples. We are not seeing a Cold War type ideological confrontation in the Ukraine, but it is an open question whether the Russian people, for instance, are gaining anything substantial from the war right now.

The Ukraine situation, though, points to the primacy of sovereignty and issues flowing from it in these post-Cold War times. What Ukraine impresses on ambitious global powers is the impossibility of waging colonial era type military interventions in particularly the global South at present. Ukraine, under President Zalenskyy, has decided to fight back the Russian invasion tooth-and-nail and the likelihood is that there would be no clear winners from this war of attrition.

An independent country which is committed to protecting its sovereign rights has no choice but to fight back forces that are intent on destroying it and this is the task that Ukraine has set for itself right now.

On the other hand, the Russian political and military establishments are in an effort to revive the colonial project in Ukraine, which is a preposterous proposition in the present global political order which is gravitating towards political and economic liberalization. Given this backdrop it is small wonder that the West and its military arm, NATO, are firmly behind Ukraine.

Not surprisingly, the West is seeing in the Russian invasion of Ukraine a flagrant violation of all the political values that it claims to uphold and protect. There is no turning back on the moves towards political and economic liberalization that characterize the current neo-liberal age.

Moreover, by invading Ukraine it could be said that Russia is in an attempt to take the world back to some of the earliest stages in the development of modern day capitalism. Besides, if Russia’s reasons for invading Ukraine are to be accepted, any bullying big power could consider itself justified in invading its smaller neighbours, which it sees as coming under its suzerainty.

Accordingly, the world is in for a long-running East-West proxy war in the Ukraine. However, the world’s security worries would in no way end with the Ukraine because it also has other major concerns in the form of the Middle East blood-letting and the Taiwan Straits, in addition to those parts of Africa that are continuing to be weighed down by inter and intra-state turmoil.

In the Middle Eastern theatre and in the Taiwan Straits, intervention by the West is bound to continue and intensify because the latter sees some its crucial interests as being threatened in the relevant regions. Despite its keenness to extend humanitarian assistance to the war-affected populations in the Gaza, the US remains committed to protecting Israel’s best interests.

Such concern has heightened in the wake of the current hostilities between Iran and Israel. It would be in the US’ interests to keep Iran in check because the latter is a threat to Israel as well as to the West’s oil and energy supplies. Accordingly, the US would be going the extra mile to ensure Israel’s security while preventing Iran from being too great a military and political power in the Middle East.

The US could work towards the latter aims by constantly arming Israel and ensuring that the military balance in the region is constantly in favour of Israel rather than its foes’. Here too, then, is an ongoing proxy war between the West and the East; the latter taking the form of Iran which is backed by China and Russia.

Another potentially destructive proxy war between West and East is, meanwhile, working itself out in the Taiwan Straits. The US has over the years been seeing itself as a natural ally of Taiwan because the latter is a capitalist outpost in South East Asia as well as being viewed as an adversarial, break-way state by China. In its efforts to contain the power of China in Asia, the US has been seeing it to be in its interests to ensure the security of Taiwan as against China’s growing regional predominance. All this works out to more Western military aid to Taiwan, going forward.

Accordingly, proxy wars between West and East are once again surfacing unsettlingly in international politics. Military budgets of Western powers are set to grow at the expense of welfare budgets. Needless to say, the latter trend will eventually result in growing public unrest and anger towards governments.

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Artificial Intelligence: Are we getting into it with our eyes open? – Part II

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by Prof. Janendra De Costa

Senior Professor and Chair of Crop Science, Faculty of Agriculture, University of Peradeniya

How prepared is Sri Lanka for AI?

With the initiative coming from the very top, it is likely that AI will come to the fore at least in the official documents on development strategy and policy in the near future. As promised by the Minister of Education, AI is likely to make its way in to school curricula as well. Being an election year, there is a good possibility that the manifestos of all mainstream political parties in Sri Lanka will carry statements about promoting AI. Therefore, it is pertinent to ask whether Sri Lanka has the pre-requisites for successful adoption of AI in its key sectors and whether AI can be included in the school curricula from next year onwards. While confessing to be a non-expert in AI, my view, as an educator, researcher and a practitioner of Science is that Sri Lanka needs a substantial effort to first build a foundation for successful adoption of AI.

First and foremost, Sri Lanka lacks the human capital, an adequate number of trained personnel and practitioners in AI. The considerable exodus of experts in computer science and related technologies since the 2022 economic collapse and its repercussions in the aftermath have left the country significantly impoverished in terms of expertise in almost all established disciplines. The scarcity of experts would be even more acute in new, emerging disciplines such as AI. When the President and the Minister of Education talks about including AI in the school curricula, it is doubtful whether they have considered the availability adequately trained teachers to teach AI in schools or whether there has been adequate preparation in terms of computer facilities, textbooks (printed or electronic) and other learning resources.

Secondly, the past record of adopting new, emerging technologies in Sri Lanka tells us that the tendency will, most probably, be to adopt AI tools developed elsewhere with algorithms trained on data collected elsewhere. Only a small minority of the Sri Lankan experts is likely to take the considerably more difficult pathway of developing our own AI tools and training them on data collected specifically in a Sri Lankan context. As mentioned earlier in this article, the big, comprehensive data sets on which to train AI algorithms do not exist at present in most of the key areas where AI could make a significant positive contribution to national development of Sri Lanka. With the present and past levels of government investment on R & D in S & T (Sri Lanka with only 0.1% of its GDP invested in Science and Technology ranks among the lowest in the world in this index), there is little hope that there will be adequate and sustained support to develop our own AI tools to tackle the specific development needs of higher priority to Sri Lanka. The argument that why spend so much to develop our own AI tools when those already developed elsewhere are available will readily come from the government officials, especially those in the treasury, who have little understanding of how advancements in S & T take place via R & D.

Sri Lanka’s previous experiences in adopting new, emerging technologies

While we are about to embark on a journey to integrate AI into our national agenda, it is worth noting how similar initiatives in the past to integrate new, emerging technologies have fared. In this regard, the story of nanotechnology is especially relevant and offers valuable lessons. Nanotechnology in Sri Lanka was first promoted around 2005 as a technology that carried enormous promise for Sri Lanka to propel itself to the next level economic development via production of globally competitive nanoproducts. The initiative was spearheaded by the newly appointed Minister of Science and Technology, who was himself a former scientist and a former director of a state-sector research institute. The argument at the time was that Sri Lanka should invest its limited financial, infrastructural and humany resources on R & D in a few high potential areas rather than spreading it across all disciplines. Nanotechnology and biotechnology were the high-potential areas that were identified. The Sri Lanka Institute of Nanotechnology (SLINTEC) was established with state-of-the-art facilities on par with those available in developed countries and a select group of scientists from Sri Lanka and a few expatriate Sri Lankan scientists were employed on remuneration packages which were far superior to that enjoyed by the scientists in state sector R & D institutions. The initial funding came from a public-private partnership between the government and a few private sector organizations. It is worth noting that to provide its share of the venture, the National Science Foundation, the premier government organization that was funding S & T research in Sri Lanka diverted all its allocation for research from the treasury to the SLINTEC, thereby depriving research funding to all other areas of Science and Technology for a few years. To cut a long story short, today, after nearly 20 years, the expected nanotechnology boom along with the globally-competitive nanoproducts and the projected increase in the national GDP have not materialized while the SLINTEC, with all its state-of-the-art facilities barely survives, struggling to sustain itself financially, with all its expatriate Sri Lankan scientists gone back to their adopted countries and almost all Sri Lankan scientists who were employed initially having left for universities, in Sri Lanka and abroad. The most notable achievement of SLINTEC during this period was the development of a urea-based nanofertiliser, which when applied to the soil had the capability to release nitrogen slowly, thus facilitating its uptake by plant roots with minimum losses due to leaching. However, the US patent of this product, which was developed with a significant contribution of public funds of the Sri Lankan government was sold to a foreign company in a transaction, the details, and conditions of which are still not transparent to the general public. Ironically, after having spent so much on developing a nanofertiliser of its own, Sri Lanka had to spend another huge sum of public money to purchase a liquid nanofertiliser during the ill-fated 100% organic agriculture drive. Like the 100% organic agriculture project, the imported liquid nanofertilizer turned out to be largely ineffective.

The lesson that can be learnt (for those who are willing to learn) from Sri Lanka’s experience to adopt and promote nanotechnology is that successful and widespread adoption of a new technology is not possible without first establishing a broad base of R & D expertise and infrastructure in an adequately wide range of disciplines and applications. Establishing a centralised institute, however well-equipped, will not be sustainable in the long run and will not make a significant impact on national development. The adoption of biotechnology in Sri Lanka, which emerged as a discipline of high promise to Sri Lanka in the 1990s, is marginally better though nowhere near the level required to boost the national economy. When the present Minister of Education was holding the portfolio for Technology and Research under a previous administration, there was a proposal by a few academics close to him to establish a well-equipped Centre for biotechnology along the same lines as SLINTEC. The present author, as a member of the National Science and Technology Commission (NASTEC) at the time, advocated establishment of several biotechnology research groups in key areas of its applications and supporting them through equipment and other resources rather than spending on establishing one big Centre. This advice fell on deaf ears and the proposal went ahead but stalled when the Minister left his portfolio. This is illustrative of many initiatives in Sri Lanka, especially related to Science and Technology, which come from the top (i.e. the politicians). These proposals often come with a ‘sell-by-date’, which is either the next election or the period of the politician in charge of the specific Ministry. It is important to take into account all these historical facts and learn lessons from them when embarking on this new initiative to promote, develop and adopt AI.

Concluding remarks

There is no doubt that AI has the potential to bring about significant positive impacts in several key sectors of the Sri Lankan economy and many facets of the day-to-day life of the Sri Lankans. However, it is important to understand that realization of that enormous potential of AI, which is already happening in the developed world4,7, requires a substantial investment from within Sri Lanka to educate itself on the strengths and limitations of AI and develop, as much as possible, AI tools of its own or adopt those developed elsewhere only after rigorous validation within the Sri Lankan context. Adequate precautions are required to address the inherent limitations of AI, formulate and implement safeguards against the risks and illusions posed by AI and to guard against total reliance on AI once it gains the trust of its users1,5. In particular, measures are needed to prevent the loss of creativity in future generations of Sri Lankans, especially the students and other learner groups, who are highly likely to be hooked on AI tools in their learning process.

Additional Reading

1. Why scientists trust AI too much – and what to do about it. (Editorial). Nature, 627: 243. 14 March 2024. https://doi.org/10.1038/s41586-023-06221-2.

2. Alvarado, R. (2023). What kind of trust does AI deserve, if any?. AI and Ethics, 3(4): 1169-1183. https://doi.org/10.1007/s43681-022-00224-x.

3. Carroll, J. M. (2022). Why should humans trust AI?. Interactions, 29(4), 73-77. https://doi.org/10.1145/3538392.

4. Krenn, M. et al. (2022). On scientific understanding with artificial intelligence. Nature Reviews Physics, 4(12): 761-769. https://doi.org/10.1038/s42254-022-00518-3.

5. Messeri, L. & Crockett, M.J. (2024). Artificial intelligence and illusions of understanding in scientific research. Nature, 627: 49-58. https://doi.org/10.1038/s41586-024-07146-0.

6. von Eschenbach, W.J. (2021). Transparency and the Black Box problem: Why we do not trust AI. Philosophy & Technology, 34: 1607–1622. https://doi.org/10.1007/s13347-021-00477-0.

7. Wang, H. et al. (2023). Scientific discovery in the age of artificial intelligence. Nature, 620: 47-60. https://doi.org/10.1038/s41586-023-06221-2.

The writer is a Fellow of the National Academy of Sciences of Sri Lanka and has been an academic and a research scientist in Agriculture and Natural Sciences for over three decades while being based in Sri Lanka.

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Promote purple sweet potato

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By Prof. Kirthi Tennakone

The sweet potato is probably the oldest cultivated crop. Native to tropical America, Peruvians grew it 8,000 years ago. Colombus introduced sweet potatoes to Europe; later the Spanish and Portuguese dispersed the species in Asia and Africa. Today, sweet potato is one of the staple foods that alleviate starvation and malnutrition in many parts of the globe.

In the tropics, sweet potatoes produce more food per hectare than any other cultivation. Being drought – resistant and requiring minimal irrigation, fertilizer and pesticide inputs, the crop would be a promise for the world confronted by climate change.

There are highly nutritious varieties of sweet potatoes, of which sweet potato with bright purple flesh; rich in disease-fighting agents, vitamins, minerals and fiber is emerging as a superfood – chosen as the vegetable of the year 2024 by Veganuary (the organization that promotes vegetarianism by abstaining from eating animal-based food in the month of January, every year)

The sweet potato stands out as the first genetically modified vegetable people have unknowingly consumed for millennia. The modification was done not by humans, but by a bacterium found in soil. The ancestor of sweet potatoes was a creeper belonging to the Morning Glory family (Convalesce). Thousands of years ago microbe named Agrobacterium transferred a portion of its DNA (a gene) into the genome of a plant of the original kind in Ecuador, favourably altering its characteristics. In the modified plant, roots were enlarged to yield giant tubers, storing starch, proteins, minerals, water and a host of other beneficial substances. Naturally, the genetically engineered variety withstood harsh conditions and survived better. Noting the exceptional food value, South American farmers domesticated the transgenic species. The rise of Mayan and Aztec civilizations owes much to the sweet potato. Transgenic crops can do wonders!

Today, thousands of cultivars of sweet potato exist, generally described by the colour of the skin and flesh of the yam. The skin colours of white, brown, pink, yellow and purple are common, and the flesh colours vary from white, yellow and orange to purple. These colours originate from two types of pigments known as carotenes and anthocyanins.

Apart from chlorophyll, which imparts green colour to leaves, plants carry two other pigment types: carotenes yellowish orange in colour and anthocyanins displaying hues ranging from red to blue. As we all know, in leaves chlorophyll harvests sunlight and utilizes trapped energy to fix carbon dioxide synthesizing carbohydrates. Carotene and anthocyanins, present in leaves and other plant tissue play an important role in photosynthesis and other plant biochemical processes and give conspicuous colours to flowers, fruits and yams.

Nowadays, people are told to eat coloured vegetables and fruits, because carotenes and anthocyanins have numerous health benefits, including the prevention of cancer, heart disease, diabetes and dementia. What is the secret of coloured produce? A condition that greatly contributes to the above complications is oxidative stress, a side effect of the indispensable oxygen we continuously breathe. Oxygen burns carbohydrates and fat in our bodies, liberating energy and releasing water and carbon dioxide. However, this chemical reaction creates highly reactive molecular species, known as free radicals. Free radicals damage DNA and attack cellular tissue, causing disease and aging. Fortunately, there are agents called antioxidants that scavenge free radicals before they do any harm. Carotenes and anthocyanins act as superb antioxidants.

Current research reveals anthocyanins, the red and blue pigments in vegetables and fruits have a myriad of health benefits because they are water soluble and transmissible throughout the body after absorption from the gut. They effectively quench free radicals, reducing DNA and cellular damage – a primary cause of cancer and inflammatory diseases. Anthocyanins cross the blood-brain barrier and possess a protective action against neurodegenerative cognitive impairments such as Parkinsonism and Alzheimer’s disease. With the increase in human longevity, these illnesses pose a major health issue for which no curative treatments are available. Recent investigations provide evidence for the beneficial effect of consuming anthocyanins rich vegetables in reducing the risk of developing these debilitating conditions.

The brilliantly coloured purple sweet potatoes are gaining recognition as a superfood because of the exceptionally high anthocyanin content, and the remarkable stability of the pigment and its resistance to cooking. The Spanish seemed to have collected this special variety of sweet potatoes from the Aztecs in Peru and planted it in the Philippines around the 1400s and from there, it spread to China and Japan. The climate on the island of Okinawa was ideal for sweet potatoes, a staple food for the islanders, who preferred the purple variety. Okinawans obtain more than 50% of their calorie requirements from sweet potatoes. The incidence of cancer, heart disease and dementia stand remarkably low in this land and people live relatively long compared to other regions of the world. Are purple sweet potatoes the secret of Okinawan longevity and healthiness?

Of course, other factors such as lifestyle and assortments in the diet would contribute to the good health and longevity of the people of Okinawa. As more and more studies confirm the consumption of purple sweet potatoes is indeed an important cause, the world is rushing to cultivate this crop and promote its consumption.

Purple-fleshed sweet potatoes are rare in Sri Lanka. The farmers and consumers are largely unaware of its value.

The author was fascinatingly attracted to purple sweet potato, because of his interest in anthocyanin pigments, which he used to demonstrate a novel solar cell concept for the first time now pursued worldwide. He successfully grew this plant in his home garden, Hantana, Kandy, and obtained a good yield; some tubers weighed more than a kilo. Purple sweet prefers colder night temperatures. Our Central Highlands are probably best suited to cultivating this crop. He wishes Sri Lankans will cultivate this crop and promote its consumption.

(The author is a theoretical physicist, formerly working at the Institute of Fundamental Studies, Sri Lanka. He can be reached via email: ktenna@yahoo.co.uk)

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