May...
Not ‘has been proven’?
The same google search gives me that one article, one more below and a bunch of stuff on astronomy?
https://jandonline.org/article/S2212-2672(16)30005-3/fulltext
As an omnivore, it is likely I get enough Vit K and the article states lots more research is needed
Anyhow thanks (esp for the sarcasm) but work beckons
That was the 3 second search. I will give links to (say) 10 academic articles later to help you or anybody else who values their health to learn more about the subject.
Vitamin K comes in 2 forms - K1 and K2. As an omnivore (or any other 'vore') you ARE very likely to get enough K1 in your diet. (If you were not getting it then your blood would not clot so you would effectively become a haemophiliac.)
We are talking about K2, which has a different role in the body. There used to be a theory (by doctors, scientists, researchers, people who actually work in the field, NOT people selling supplements) that there was not a problem with humans getting enough K2 because there is a mechanism in the body for K1 (which, as stated above, there is plenty of) to be converted to K2. Further research has now shown that in humans this is an inefficient process and most of the K2 thus produced is not bio-available. Animals such as cows with very different digestive systems to us are very good at producing bio-available K2, given the right diet themselves.
Humans need to get it as K2 in their diet and not rely on their K1->K2 process. As an omnivore in 1900 you definitely WOULD have been getting enough in your diet because the animals that you ate (or which produced the dairy products and eggs that you ate) were feeding on high quality grass outdoors. These days, however, most people get animal products from animals that are fed a poorer diet which means that their K2 production is way down on what it would have been in past centuries. That in turn means that humans are often not getting enough K2.
K2 deficiency has repeatedly been shown to lead to poor quality bones and calcification in soft tissues. Osteoporosis and vascular disease have increased as K2 consumption has decreased.
As I mentioned previously, fermented products do contain more vitamin K2 and certain foreign cheeses are still made from milk of a high enough quality that they contain appreciable amounts of K2. So, it is POSSIBLE to get K2 from diet alone (that is the natural way!) but you need a natural diet to do so. That doesn't mean meat, milk, cheese, and eggs - it means HIGH QUALITY meat, milk, cheese, and eggs from animals not stuffed with corn pellets and spending most of their lives indoors. Most meat products, dairy and eggs now are NOT high quality.
The fermented soya product natto is a delicacy in certain parts of Japan. Where they eat it, they eat a LOT of it. It contains massive amounts of K2. Research has shown that it is rare for women in those parts of Japan to suffer from osteoporosis and the rates of heart disease and stroke are also lower. In the parts of Japan where they do not eat natto, osteoporosis is much more common. Japanese researchers have investigated that.
Anyway, I have things to do too. I'll put up links to 10 examples of interesting research later.