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Conversion of dietary phylloquinone to tissue menaquinone-4 in rats is not dependent on gut bacteria. Davidson RT, Foley AL, Engelke JA, Suttie JW. J Nutr. 1998 Feb;128(2):220-3. PMID: 9446847 These data offer conclusive proof that the tissue-specific formation of MK-4 from K is a metabolic transformation that does not require bacterial transformation to menadione as an intermediate in the process

The Author The author of this site is the British writer, John Davidson. Please note that the author is neither a doctor, nor a qualified health practitioner. Every cancer patient should always consult his or her medical practitioner with regard to the use of complementary remedies or treatments, and nothing on this site should be construed in any way as medical or therapeutic advice. It is simply the result of one person's search for solutions. Please read our disclaimer. About This Site Internet searches trawl up vast amounts of information about cancer, from a broad spectrum of viewpoints. The information and internet links on this site are for those seeking to augment the treatment offered by their hospital oncology (cancer) unit. Of course, a great many other internet sites concerning cancer can be found by keying the requisite search words into any of the major search engines. The content of this site was initially prepared, at the request of medical and nursing staff and others, some weeks after I had had an emergency operation for the removal of a colon cancer, and while undergoing chemotherapy in case any cancer cells had gone AWOL. There had been some escape of cancer cells into associated lymph nodes (3 out of 17, including the most distal), but no other tumours had been picked up by a CT scan. When I returned home from hospital in September 2005, with the help of friends, I started doing some research on cancer. I was amazed to discover that despite the billions of pounds/euros/dollars etc. spent on cancer research, and the many advances in understanding the numerous variants of the disease, the standard treatment for my stage of colon cancer is still a drug (fluorouracil, also called 5FU) that has been in use for more than forty years, has uncomfortable side effects, and which only increases the chances of survival after five years by 5 to 10%.

Martineau AR, Wilkinson RJ, Wilkinson KA, Newton SM, Kampmann B, Hall BM, Packe GE, Davidson RN, Eldridge SM, Maunsell ZJ, Rainbow SJ, Berry JL, Griffiths CJ. A single dose of vitamin D enhances immunity to mycobacteria. Am J Respir Crit Care Med. 2007

Immunomodulatory effects of (n-3) fatty acids: putative link to inflammation and colon cancer. Chapkin RS, Davidson LA, Ly L, Weeks BR, Lupton JR, McMurray DN. J Nutr. 2007 Jan;137(1 Suppl):200S-204S. PMID: 17182826

Tissue phylloquinone and menaquinones in rats are affected by age and gender. Huber AM, Davidson KW, O'Brien-Morse ME, Sadowski JA. J Nutr. 1999 May;129(5):1039-44. PMID: 10222397 The results suggest that in extrahepatic tissues, certain menaquinones may be the predominant form of vitamin K. The specific tissue distribution and the general decline of MK-4 and MK-6 in extrahepatic tissues during aging suggest a vitamin K tissue dynamic that is affected not only by diet, but also by gender, age and the specific roles of phylloquinone, MK-4 and MK-6 in metabolism. All of these factors must be taken into account in establishing the nutrient requirement for vitamin K.

Cholesterol, coconuts, and diet on Polynesian atolls: a natural experiment: the Pukapuka and Tokelau island studies. Prior IA, Davidson F, Salmond CE, Czochanska Z. Am J Clin Nutr. 1981 Aug;34(8):1552-61. PMID: 7270479 Two populations of Polynesians living on atolls near the equator provide an opportunity to investigate the relative effects of saturated fat and dietary cholesterol in determining serum cholesterol levels. The habitual diets of the toll dwellers from both Pukapuka and Tokelau are high in saturated fat but low in dietary cholesterol and sucrose. Coconut is the chief source of energy for both groups. Tokelauans obtain a much higher percentage of energy from coconut than the Pukapukans, 63% compared with 34%, so their intake of saturated fat is higher. The serum cholesterol levels are 35 to 40 mg higher in Tokelauans than in Pukapukans. These major differences in serum cholesterol levels are considered to be due to the higher saturated fat intake of the Tokelauans. Analysis of a variety of food samples, and human fat biopsies show a high lauric (12:0) and myristic (14:0) content. Vascular disease is uncommon in both populations and there is no evidence of the high saturated fat intake having a harmful effect in these populations.