{"id":4650,"date":"2022-10-11T07:40:04","date_gmt":"2022-10-11T11:40:04","guid":{"rendered":"https:\/\/www.chaneyhealth.com\/healthtips\/?p=4650"},"modified":"2022-09-28T23:47:54","modified_gmt":"2022-09-29T03:47:54","slug":"can-tomatoes-be-engineered-to-produce-vitamin-d3","status":"publish","type":"post","link":"https:\/\/www.chaneyhealth.com\/healthtips\/can-tomatoes-be-engineered-to-produce-vitamin-d3\/","title":{"rendered":"Can Tomatoes Be Engineered To Produce Vitamin D3?"},"content":{"rendered":"<h2 style=\"text-align: center;\"><span style=\"color: #008000;\"><strong>The Good And Bad Of Genetically Modified Foods<\/strong><\/span><\/h2>\n<p style=\"text-align: center;\"><strong>Author: Dr. Stephen Chaney<\/strong><strong>\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/?attachment_id=4651#main\" rel=\"attachment wp-att-4651\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-4651\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/GM-Fruit-Depositphotos_10154874_xs-300x194.jpg\" alt=\"GM Fruits\" width=\"300\" height=\"194\" srcset=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/GM-Fruit-Depositphotos_10154874_xs-300x194.jpg 300w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/GM-Fruit-Depositphotos_10154874_xs.jpg 430w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>The Floodgates have been opened. The USDA has just approved a genetically engineered purple tomato that contains the anthocyanins found in blueberries, blackberries, and eggplant. It could be appearing in your supermarkets as early as next spring.<\/p>\n<p>And that is just the beginning. Several other genetically modified tomatoes are waiting in the wings. One example is a tomato that has been genetically engineered to produce vitamin D<sub>3<\/sub> (<a href=\"https:\/\/www.nature.com\/articles\/s41477-022-01154-6\"><span style=\"color: #0000ff;\">J Li et al, Nature Plants, 8: 611-616, 2022<\/span><\/a>).<\/p>\n<p>\u201cWhy would you want that?\u201d, you might ask. The rationale is simple:<\/p>\n<ul>\n<li>It starts with the fact that one billion people worldwide (<a href=\"https:\/\/www.nature.com\/articles\/s41477-022-01154-6\"><span style=\"color: #0000ff;\">J Li et al, Nature Plants, 8: 611-616, 2022<\/span><\/a>) and 42% of the US population have vitamin D insufficiency (<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0271531710002599\">KYZ Forrest and WL Stuhldreher, Nutrition Research 31: 48-54, 2011<\/a><\/span>), which is defined by the <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/ods.od.nih.gov\/factsheets\/VitaminD-HealthProfessional\/\">NIH<\/a><\/span> as vitamin D levels that are \u201cinadequate for bone and overall health in otherwise healthy individuals\u201d.<\/li>\n<\/ul>\n<ul>\n<li>And vitamin D insufficiency is not a trivial matter. In the words of the authors, in addition to bone health, vitamin D insufficiency \u201cimpacts immune function and inflammation and is associated with increased risk of\u2026cancer, Parkinson\u2019s disease, depression, neurocognitive decline, dementia, and the risk of coronavirus disease\u2026\u201d<\/li>\n<\/ul>\n<ul>\n<li>Add to that the fact that tomatoes are grown and consumed in more than 170 countries worldwide. The authors felt that increasing the vitamin D content of tomatoes could be a simple and effective way to improve the vitamin D status of millions of people around the world.<\/li>\n<\/ul>\n<p>In their own words, \u201cWe have developed a new dietary source of vitamin D in plants to meet the increasing demand for ways to address vitamin D insufficiency, which is of particular relevance to those adopting plant-rich, vegetarian or vegan diets.\u201d<\/p>\n<p>But is that true and is it safe? That is the topic of today\u2019s health tip. But before I cover those topics, I should give you some background on vitamin D metabolism in humans and in plants.<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>Metabolism 101: Vitamin D Metabolism In Humans &amp; Plants<\/strong><\/span><\/h2>\n<p>7-dehydrocholesterol is the precursor to vitamin D<sub>3<\/sub> in both humans and plants, but the amount of 7-dehydrocholesterol and the metabolic pathways producing it are very different.<\/p>\n<p><a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/?attachment_id=4652#main\" rel=\"attachment wp-att-4652\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-4652\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Vitamin-D-Metabolism-in-Humans-And-Tomatoes-1024x512.jpg\" alt=\"\" width=\"1024\" height=\"512\" srcset=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Vitamin-D-Metabolism-in-Humans-And-Tomatoes-1024x512.jpg 1024w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Vitamin-D-Metabolism-in-Humans-And-Tomatoes-300x150.jpg 300w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Vitamin-D-Metabolism-in-Humans-And-Tomatoes-768x384.jpg 768w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Vitamin-D-Metabolism-in-Humans-And-Tomatoes.jpg 1209w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><span style=\"color: #3366ff;\"><strong>Human Vitamin D3 Metabolism:<\/strong><\/span><\/p>\n<ul>\n<li>In humans, cholesterol is the precursor to 7-dehydrocholesterol. About 70% of cholesterol is synthesized by the liver, with the remaining 30% coming from our diet.<\/li>\n<\/ul>\n<ul>\n<li>7-dehydrocholesterol is synthesized from cholesterol in the epidermis (outer layer) of our skin. It is present in large amounts there but is present in only small amounts in the rest of the body.<\/li>\n<\/ul>\n<ul>\n<li>UVB light is a component of sunlight, and UVB light drives the conversion of 7-dehydrocholesterol into vitamin D<sub>3<\/sub> in our skin.<\/li>\n<\/ul>\n<p><span style=\"color: #3366ff;\"><strong>Plant Vitamin D3 Metabolism:<\/strong><\/span><\/p>\n<ul>\n<li>In plants, the pathway is reversed. 7-dehydrocholesterol is synthesized from other plant sterols. And 7-dehydrocholesterol is converted to cholesterol.<\/li>\n<\/ul>\n<ul>\n<li>Cholesterol, in turn, is used to synthesize glycoalkaloid compounds that protect the plants from pests.<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>The gylcoalkaloids differ from plant to plant. In tomatoes the major ones are \u03b1-tomatine and esculeoside A and B.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>\u03b1-tomatine and esculeoside A and B protect tomatoes from fungal, microbial, insect, and herbivoral attack.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Normally, 7-dehydrocholesterol and cholesterol present in very low amounts in plants because they are used to synthesize protective glycoalkaloid compounds.<\/li>\n<\/ul>\n<ul>\n<li>UVB light is still required to convert 7-dehydrocholesterol to vitamin D<sub>3<\/sub>.<\/li>\n<\/ul>\n<h2 style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>Can Tomatoes Be Engineered To Produce Vitamin D3?<\/strong><\/span><\/h2>\n<p>Using modern genetic engineering techniques, the authors knocked out (deleted) the gene coding for the protein responsible for converting 7-dehydrocholesterol to cholesterol in tomatoes (shown as the red X in the figure above).<\/p>\n<p><span style=\"color: #3366ff;\"><strong><a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/?attachment_id=4653#main\" rel=\"attachment wp-att-4653\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-4653\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Tomatoes_Depositphotos_1342563_XL-300x200.jpg\" alt=\"Tomatoes\" width=\"300\" height=\"200\" srcset=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Tomatoes_Depositphotos_1342563_XL-300x200.jpg 300w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Tomatoes_Depositphotos_1342563_XL-1024x683.jpg 1024w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Tomatoes_Depositphotos_1342563_XL-768x512.jpg 768w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Tomatoes_Depositphotos_1342563_XL-1536x1024.jpg 1536w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2022\/09\/Tomatoes_Depositphotos_1342563_XL-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>In the fruit:<\/strong><\/span><\/p>\n<ul>\n<li>7-dehydrocholesterol levels are undetectable in ripe fruit of the wild-type tomato but were substantial in fruit of mutant tomatoes lacking the gene for converting 7-dehydrocholesterol to cholesterol.<\/li>\n<\/ul>\n<ul>\n<li>As expected, levels of \u03b1-tomatine and esculeoside A and B were substantially lower in the fruit of mutant plants.<\/li>\n<\/ul>\n<ul>\n<li>7-dehydrocholesterol was evenly distributed in the skin and flesh of the fruit, which limited the ability of UVB light to convert all the 7-dehydrocholesterol to vitamin D3.<\/li>\n<\/ul>\n<ul>\n<li>Even so, a one-hour exposure of the fruit to UVB light produced about 2 \u03bcg of vitamin D<sub>3<\/sub> in a medium sized tomato.<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>That is equivalent to the vitamin D<sub>3<\/sub> found in two eggs or 6 ounces of tuna, which are both recommended sources of vitamin D3.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>The only non-fortified foods that are better sources of vitamin D<sub>3<\/sub> are salmon and trout, which provide about 15 \u03bcg of vitamin D3 in a 3-ounce serving<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>The authors further speculated that the vitamin D<sub>3<\/sub> content could be increased even more by:<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Cutting the fruit into slices and air drying them in sunlight.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Removing the gene that produces UV-protecting chalcones in the skin of the fruit, thus allowing UVB light to penetrate further into the fruit. This is typical thinking by some of my scientific colleagues. If one mutation is good, two or more would be even better.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>The authors concluded, \u201cWe have developed a new dietary source of vitamin D in plants to meet the increasing demand for ways to address vitamin D insufficiency\u201d<\/p>\n<p><span style=\"color: #3366ff;\"><strong>In the leaves:<\/strong><\/span><\/p>\n<ul>\n<li>Qualitatively, the results were similar to those seen with the fruit.<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>7-dehydrocholesterol levels were very low in the wild-type tomato but were substantially increased in the mutant tomatoes.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Levels of \u03b1-tomatine and esculeoside A and B were substantially lower in the leaves of the mutant plants.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Quantitatively, however, the results were different.<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>The amounts of 7-dehydrocholesterol were 300 to 600-fold higher in the leaves than in the ripe fruit.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>The amount of vitamin D<sub>3<\/sub> produced by a one-hour exposure to UVB light was 1,000-fold higher in the leaves than in the ripe fruit.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>While people don\u2019t eat the leaves of tomato plants, the authors visualized a different use for this material.<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>They envisioned using what would otherwise be waste vegetative material from growing tomatoes to produce vitamin D<sub>3<\/sub> for vitamin D supplements.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>This would be particularly beneficial for vegans because most vegan sources of vitamin D are vitamin D<sub>2<\/sub>, which is less effective than vitamin D<sub>3<\/sub>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>In the words of the authors, \u201cThe leaves of the mutant plants are rich sources of 7-dehydrocholesterol\u2026[and could be used] for the manufacture of vitamin D<sub>3<\/sub> supplements from plants that would be suitable for vegans\u2026\u201d<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>The Good And Bad Of Genetically Modified Foods<\/strong><\/span><\/h2>\n<p><a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/fodmap-diet-reduce-gas-and-bloating\/good-news-bad-news\/#main\" rel=\"attachment wp-att-1924\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-1924\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2016\/07\/good-news-bad-news-300x300.jpg\" alt=\"good news bad news\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2016\/07\/good-news-bad-news-300x300.jpg 300w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2016\/07\/good-news-bad-news-150x150.jpg 150w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2016\/07\/good-news-bad-news-50x50.jpg 50w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2016\/07\/good-news-bad-news-200x200.jpg 200w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2016\/07\/good-news-bad-news.jpg 332w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>Like much else in today\u2019s world of social media and online blogs and podcasts, both the benefits and risks of genetic engineering have been greatly exaggerated. I have discussed this topic at length in a previous <a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/gmo-labeling-required-food-ingredients\/\"><span style=\"color: #0000ff;\"><strong>issue<\/strong><\/span>\u00a0<\/a> of \u201cHealth Tips From The Professor\u201d.<\/p>\n<p>On the one hand, my genetic engineering colleagues tend to focus on the genetic alteration that is beneficial and ignore other changes in the genetically altered food that could pose some risk.<\/p>\n<ul>\n<li>I would be the first to admit that most of the risks are very small and unlikely to occur, but I think each potential risk should be thoroughly investigated before we release the genetically altered plant into the world.<\/li>\n<\/ul>\n<ul>\n<li>As an analogy, I will use the story of Pandora\u2019s Box. Pandora was given the box by an angry Greek God, who told her never to open it. But her curiosity got the beat of her. Once Pandora opened the box, she released sickness, death, and other evils into the world. And once they had been released, there was no way to get them back into the box. We don\u2019t want to run this kind of risk with genetically altered plants.<\/li>\n<\/ul>\n<p>On the other hand, there are the \u201cChicken Little\u2019s\u201d of the world who assume every potential risk is real and warn us that, \u201cThe sky is falling\u201d. Most of the risks are theoretical only. They may never happen. I am just saying they should be examined before we release genetically altered plants into the wild.<\/p>\n<p>In this article, I will try to avoid both extremes. I will put on my \u201csceptic\u2019s hat\u201d (Every good scientist keeps one of those in his or her closet) and carefully evaluate the benefits and the risks associated with using both the fruit and the leaves of this genetically altered tomato plant.<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>Tomato Fruit Engineered To Produce Vitamin D3<\/strong><\/span><\/h2>\n<p><span style=\"color: #3366ff;\"><strong>The Benefit:<\/strong><\/span><\/p>\n<p>The benefit is obvious. As the authors said, tomatoes are a widely consumed worldwide. The availability of an inexpensive plant source of vitamin D<sub>3<\/sub> could go a long way towards improving vitamin D status in third world countries where vitamin D<sub>3<\/sub> supplementation may not be practical.<\/p>\n<p><span style=\"color: #3366ff;\"><strong><a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/its-buyer-beware-in-the-food-and-supplement-industries\/serious-man-looking-through-magnifying-glass\/#main\" rel=\"attachment wp-att-4026\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-4026\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2020\/07\/Sceptic-Depositphotos_72232485_s-2015-200x300.jpg\" alt=\"Skeptic\" width=\"200\" height=\"300\" srcset=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2020\/07\/Sceptic-Depositphotos_72232485_s-2015-200x300.jpg 200w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2020\/07\/Sceptic-Depositphotos_72232485_s-2015.jpg 333w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a>My Concerns:<\/strong><\/span><\/p>\n<ol>\n<li>Are there health risks?<\/li>\n<\/ol>\n<ul>\n<li>Most genetically engineered foods contain a protein sequence that is not found in the non-modified food. This raises the possibility of food allergies to the novel protein. The <span style=\"color: #3366ff;\"><strong>good news<\/strong><\/span> is that a protein has been removed in this mutant plant. There is no novel protein, so the chance of these tomatoes triggering food allergies is extremely small.<\/li>\n<\/ul>\n<ul>\n<li>However, these fruits do contain altered DNA. As I said in my previous <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/www.chaneyhealth.com\/healthtips\/gmo-labeling-required-food-ingredients\/\"><strong>article<\/strong><\/a><\/span>, one could imagine scenarios in which this could pose a health risk. I also pointed out that this is a theoretical concern, not one that has been proven to occur.<\/li>\n<\/ul>\n<ul>\n<li>In addition, these fruits have been irradiated with high-intensity UVB light for an hour. This converts some of the 7-dehydrocholesterol to vitamin D<sub>3<\/sub>. But what else does it do to the fruit? Are some of the changes harmful? The authors didn\u2019t ask.<\/li>\n<\/ul>\n<ul>\n<li>Finally, these fruits don\u2019t just have higher levels of vitamin D<sub>3<\/sub>. They also have much higher levels of 7-dehydrocholesterol than normal tomatoes. In humans, 7-dehydrocholesterol is made in the skin epidermis and there is very little in other tissues.<\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\">Is dietary 7-dehydrocholesterol a problem? We don\u2019t know. One recent <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6123222\/\"><strong><span style=\"color: #0000ff;\">study<\/span><\/strong><\/a> speculated that dietary 7-dehydrocholesterol may increase the risk of atherosclerotic cardiovascular disease more than dietary cholesterol. Perhaps more study is required before we assume that this genetic modification is only beneficial.<\/p>\n<p>\u00a0\u00a0 2) Are there environmental risks?<\/p>\n<ul>\n<li>The same genetic change that increases the 7-dehydrocholesterol content of the fruit decreases \u03b1-tomatine and esculeoside A and B levels. As I stated above, \u03b1-tomatine and esculeoside A and B protect tomatoes from fungal, microbial, insect, and herbivoral attack (In my yard, herbivoral attack would be deer).<\/li>\n<\/ul>\n<ul>\n<li>The authors did not describe how these tomatoes were grown, but I would assume it was in a hothouse. That is customary for studies of newly genetically engineered foods.<\/li>\n<\/ul>\n<ul>\n<li>This raises the question of how pest susceptible these tomatoes would be when cultivated outdoors. Would increased amounts of pesticides and fungicides be needed to raise them? If so, what would the environmental impact be? The authors gave no indication that they had thought about the environmental impact if, in fact, these modified tomatoes were widely grown to solve the vitamin D insufficiency, as they proposed.<\/li>\n<\/ul>\n<p>3) Is there a risk of cross-pollination?<\/p>\n<ul>\n<li>This is a major concern for any genetically modified crop. If the modified gene were easily spread to nearby fields by cross-pollination, it could decease crop diversity and create major problems for organic farmers. Again, the authors gave no indication that they had even thought about this issue.<\/li>\n<\/ul>\n<p>4) Would these tomatoes be accepted in developed countries?<\/p>\n<ul>\n<li>I ask this question because the genetically modified Flavr Savr tomato was introduced in the US in 1996 <a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/what-is-nutrigenomics\/thumbs-down-symbol\/#main\" rel=\"attachment wp-att-3554\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-3554\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2019\/08\/thumbs-down-symbol.jpg\" alt=\"thumbs down symbol\" width=\"202\" height=\"208\" srcset=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2019\/08\/thumbs-down-symbol.jpg 202w, https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2019\/08\/thumbs-down-symbol-50x50.jpg 50w\" sizes=\"auto, (max-width: 202px) 100vw, 202px\" \/><\/a>with much fanfare, only to be withdrawn from the market in 1999 due to lack of consumer demand.<\/li>\n<\/ul>\n<ul>\n<li>And this tomato is both genetically engineered and irradiated. I am guessing most consumers would simply prefer to take a vitamin D<sub>3<\/sub><\/li>\n<\/ul>\n<p><strong><span style=\"color: #3366ff;\">My overall evaluation<\/span>.<\/strong> Despite what you may hear from genetic engineering gurus, I would give these genetically engineered tomato fruits a thumbs down. There are too many unresolved questions and concerns to consider them to be a beneficial addition to our food supply.<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>Tomato Leaves Engineered To Produce Vitamin D3<\/strong><\/span><\/h2>\n<p><span style=\"color: #3366ff;\"><strong>The Benefit:<\/strong><\/span><\/p>\n<p>Again, the benefit is obvious. As the authors said, most experts consider vitamin D<sub>3<\/sub> superior to vitamin D<sub>2<\/sub>, and there are no plant sources of vitamin D<sub>3<\/sub> that can be used to produce vitamin D<sub>3<\/sub> supplements. Leaves from this genetically modified tomato plant could be an inexpensive vegan source of vitamin D<sub>3<\/sub>.<\/p>\n<p><span style=\"color: #3366ff;\"><strong>My Concerns:<\/strong><\/span><\/p>\n<p>1.\u00a0 Are there health risks?<\/p>\n<ul>\n<li>Despite what the \u201cChicken Little\u2019s\u201d of the world may have told you, there are no health risks when an individual food ingredient is purified from a genetically modified organism. For example, vitamin D<sub>3<\/sub> purified from these genetically modified tomato leaves will contain no genetic material (DNA), no protein, no UV-damaged molecules, and no 7-dehydrocholesterol. It will be chemically and biologically indistinguishable from vitamin D<sub>3<\/sub> obtained from any other source.<\/li>\n<\/ul>\n<p>2)\u00a0 Are there environmental risks?<\/p>\n<ul>\n<li>The environmental risks are the same as for the fruit.<\/li>\n<\/ul>\n<p>3)\u00a0 Is there a risk of cross-pollination?<\/p>\n<ul>\n<li>The risk of cross-pollination is the same as for the fruit.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.chaneyhealth.com\/healthtips\/personalized-nutrition-tests-help-gain-control-blood-sugar\/thumbs-up-2\/#main\" rel=\"attachment wp-att-3544\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-3544\" src=\"https:\/\/www.chaneyhealth.com\/healthtips\/wp-content\/uploads\/2019\/07\/thumbs-up.jpg\" alt=\"thumbs up\" width=\"197\" height=\"210\" \/><\/a>4)\u00a0 Would this source of vitamin D<sub>3<\/sub> be accepted in developed countries?<\/p>\n<ul>\n<li>This should not be a concern. Nutrients from genetically modified microorganisms are widely used in natural supplements. And UVB irradiation is already used in the production of both vitamin D2 and vitamin D<sub>3<\/sub> Any UV-damaged molecules are removed in the final purification steps.<\/li>\n<\/ul>\n<p><span style=\"color: #3366ff;\"><strong>My overall evaluation.<\/strong><\/span> I would give the tomato leaves a tentative thumbs up. If the environmental and cross-pollination concerns can be overcome, the leaves could be a valuable vegan source of vitamin D<sub>3<\/sub>.<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>The Bottom Line<\/strong><strong>\u00a0<\/strong><\/span><\/h2>\n<p>Vitamin D insufficiency is a major problem, both worldwide and in the United States. A group of scientists have attempted to solve this problem by producing a genetically modified tomato plant that produces 7-dehydrocholesterol, which can be converted to vitamin D<sub>3<\/sub> by UVB irradiation.<\/p>\n<p>Plant foods are not generally a good source of vitamin D<sub>3<\/sub>. Tomatoes are grown and consumed in over 170 countries. Therefore, the scientists proposed widespread cultivation of this genetically modified tomato plant as a solution to worldwide vitamin D insufficiency.<\/p>\n<p>In addition, the leaves of these genetically modified tomato plants contain more 7-dehydrocholesterol than the fruit. Most experts consider vitamin D<sub>3<\/sub> superior to vitamin D<sub>2<\/sub>, and there are no plant sources of vitamin D<sub>3<\/sub>. The authors of this study further proposed that the leaves from this genetically modified tomato plant could be an inexpensive vegan source of vitamin D<sub>3<\/sub>.<\/p>\n<p>As I have discussed in a previous \u201cHealth Tips From The Professor\u201d article, both the benefits and risks of genetically modified foods have been greatly overstated. In this article, I evaluated both the benefits and risks of using the fruit as a plant source of vitamin D<sub>3<\/sub> and the leaves to produce vegan vitamin D<sub>3<\/sub> supplements.<\/p>\n<p>Based on a careful evaluation of benefits and risks I give the genetically modified fruit a thumbs-down. There are simply too many unanswered questions.<\/p>\n<p>On the other hand, I give vegan vitamin D<sub>3<\/sub> supplements produced from the leaves a tentative thumbs up depending on whether environmental and cross-pollination concerns can be overcome.<\/p>\n<p>For more details on this study, read the article above.<\/p>\n<p><em>These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Good And Bad Of Genetically Modified Foods Author: Dr. Stephen Chaney\u00a0 The Floodgates have been opened. The USDA has just approved a genetically engineered purple tomato that contains the anthocyanins found in blueberries, blackberries, and eggplant. It could be appearing in your supermarkets as early as next spring. And that is just the beginning. &#8230; <a title=\"Can Tomatoes Be Engineered To Produce Vitamin D3?\" class=\"read-more\" href=\"https:\/\/www.chaneyhealth.com\/healthtips\/can-tomatoes-be-engineered-to-produce-vitamin-d3\/\" aria-label=\"Read more about Can Tomatoes Be Engineered To Produce Vitamin D3?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[651,1022,1023,1],"tags":[179,1026,1025,1024],"class_list":["post-4650","post","type-post","status-publish","format-standard","hentry","category-fruits","category-genetic-engineering","category-genetically-modified-fruit","category-uncategorized","tag-genetically-modified-foods","tag-gm-fruits","tag-vitamin-d-insufficiency","tag-vitamin-d3"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Can Tomatoes Be Engineered To Produce Vitamin D3? - Health Tips From The Professor<\/title>\n<meta name=\"description\" content=\"Tomatoes have been genetically altered to produce vitamin D3. 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