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 B12, Cobalamin
B12 is vital for blood and nervious system health. B12 is not found in fungi, plants and animals. It is manufactured by bacteria and can be found in guts of animals, especially ruminants and would be stored especially in liver tissues. Man has to obtain his B12 from eating meat!
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Health Myths about Vegetarianism: The B12 Factor
There have been claims that vegetarian diet is more healthy than meat eating. Well, Wikipedia (Wikipedia 2017. Vegetarianism. en.wikipedia.org.) also shows vegetarianism offers no health benefits, but have some serious adverse health effects:
- Studies on the health effects of vegetarian diets observe heterogeneous effects on mortality. One review found a decreased overall risk of all cause mortality, cancer (except breast) and cardiovascular disease; however, a meta-analysis found lower risk for ischemic heart disease and cancer but no effect on overall mortality or cerebrovascular disease. Possible limitations include varying definitions used of vegetarianism, and the observation of increased risk of lung cancer mortality in those on a vegetarian diet for less than five years. An analysis pooling two large studies found vegetarians in the UK have similar all cause mortality as meat eaters. An older meta analysis found similar results, only finding decreased mortality in vegetarians, pescatarians, and irregular meat eaters in ischemic heart disease, but not from any other cause..... The American Dietetic Association has presented evidence that vegetarian diets may be more common among adolescents with eating disorders.
However, in contrast to the ambiguity about whether a meat or vegetarian diet is more healthy, a key medical factor is that Man requires B12 vitamin.
- Vitamin B12 is essential for the manufacture of red blood cells; a deficiency leads to a characteristic kind of anemia
Vitamin B12 is needed to support the normal function of nerve cells, and to manufacture myelin, the insulating material that surrounds some of our nerve cells and speeds neural transmission
Vitamin B12 is required for the replication of DNA (David L. Katz,1/10/2012. Vitamin B12: The Most Important Nutrient You Aren't Thinking About. www.doctoroz.com/.../vitamin-b12-most-important-nutrient-you-arent-thinking-about.)
Vegans may not realise that Man can only get the vital B12 from animal meat products!
- Food. Vitamin B12 is naturally found in animal products, including fish, meat, poultry, eggs, milk, and milk products. Vitamin B12 is generally not present in plant foods
, but fortified breakfast cereals are a readily available source of vitamin B12 with high bioavailability for vegetarians (Health Professional. 5,13-15].Feb 11, 2016. Dietary Supplement Fact Sheet: Vitamin B12
https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/)
No fungi, plants, or animals (including humans) are capable of producing vitamin B12. Only bacteria and archaea have the enzymes needed for its synthesis.... B12 is produced in nature only by some prokaryotes (certain bacteria and archaea); it is not made by any multicellular or single-celled eukaryotes. It is synthesized by some gut bacteria in humans and other animals, but humans cannot absorb the B12 made in their guts, as it is made in the colon which is too far from the small intestine, where absorption of B12 occurs. Ruminants, such as cows and sheep, absorb B12 produced by bacteria in their guts . For gut bacteria of ruminants to produce B12 the animal must consume sufficient amounts of cobalt. (Wikipedia. 2017. Vitamin B12. en.wikipedia.org).
Much recent research, of almost up to date, which vegetarians are trying to ignore or contest, consistently show that significant numbers of vegetarians can suffer from B12 deficiency:
- June 18, 2003 -- Researchers have long known that a strict vegetarian diet -- one that excludes all animal products -- can lead to vitamin B-12 deficiency, and possibly heart disease. Now, new research suggests that even those who follow a more lenient vegetarian diet are also at risk. ... They found that 92% of the vegans they studied -- those who ate the strictest vegetarian diet, which shuns all animal products, including milk and eggs -- had vitamin B12 deficiency. But two in three people who followed a vegetarian diet that included milk and eggs as their only animal foods also were deficient. Only 5% of those who consumed meats had vitamin B12 deficiency(Sid Kirchheimer. 2003. Vegetarian Diet and B12 Deficiency. Vitamin B12 Deficiency Seen in All Types of Vegetarians. www.webmd.com › Food & Recipes › News)
Vegetarian diets have been associated with atherosclerosis protection, with healthier atherosclerosis risk profiles, as well as lower prevalence of, and mortality from, ischemic heart disease and stroke. However, there are few data concerning the possible cardiovascular effects of a vegan diet (with no meat, dairy or egg products). Vitamin B-12 deficiency is highly prevalent in vegetarians; this can be partially alleviated by taking dairy/egg products in lact-ovo-vegetarians. However, metabolic vitamin B-12 deficiency is highly prevalent in vegetarians in Australia, Germany, Italy and Austria, and in vegans (80%) in Hong Kong and India, where vegans rarely take vitamin B-12 fortified food or vitamin B-12 supplements. Similar deficiencies exist in northern Chinese rural communities consuming inadequate meat, egg or dairy products due to poverty or dietary habits. Vascular studies have demonstrated impaired arterial endothelial function and increased carotid intima-media thickness as atherosclerosis surrogates in such metabolic vitamin B-12 deficient populations, but not in lactovegetarians in China. Vitamin B-12 supplementation has a favourable impact on these vascular surrogates in Hong Kong vegans and in underprivileged communities in northern rural China. Regular monitoring of vitamin B-12 status is thus potentially beneficial for early detection and treatment of metabolic vitamin B-12 deficiency in vegans, and possibly for prevention of atherosclerosis-related diseases. (Kam S. Woo,1,* Timothy C.Y. Kwok,2 and David S. Celermajer3. August 19, 2014. Vegan Diet, Subnormal Vitamin B-12 Status and Cardiovascular Health. https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC))
Animal foods are the only sources of vitamin B12 in the human diet, outside of supplements. The absorption of vitamin B12 is determined by a number of our genes, therefore must have been there over the evolution of humanity. Does this mean that people have to eat animal foods? Does the need for vitamin B12 mean that a 100% plant-based diet is unhealthy? No! The presence or absence of animal-based foods does not affect whether a diet is healthy. The healthiness of a diet is determined by whether it nourishes us, i.e. its actual nutrient content. Advances in nutrition science and industrial production of small, complex molecules have allowed us to produce vitamin B12 without the need for eating animals. Eat meat or avoid it, it's your choice.
Even so, vegans are at greater risk of vitamin B12 deficiency than ovo-lactovegetarians or omnivores (see review from Pawlak and co-workers), and this is logical as they do not obtain vitamin B12 from their food. Vegans should be aware of the lack of a source of vitamin B12 in their diet and either undergo regular testing for deficiency, or take a vitamin B12 supplement. (Julia Bird. Tue Mar 15 2016. The Other Vitamin B12 Controversy: Must We Eat Meat? https://www.dsm.com/campaigns/.../vitamin_B12_controversy_meat_vegan.html)
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