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Matti Narkia

The Bioavailability of Vitamin D from Fortified Cheeses and Supplements Is Equivalent i... - 0 views

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    The bioavailability of vitamin D from fortified cheeses and supplements is equivalent in adults.
    Wagner D, Sidhom G, Whiting SJ, Rousseau D, Vieth R.
    J Nutr. 2008 Jul;138(7):1365-71.
    PMID: 18567762

    Compared with baseline, serum parathyroid hormone decreased with both fortification (P = 0.003) and supplementation (P = 0.012). These data demonstrate that vitamin D is equally bioavailable from fortified hard cheeses and supplements, making cheese suitable for vitamin D fortification.
Matti Narkia

A Prospective Nested Case-Control Study of Vitamin D Status and Pancreatic Cancer Risk ... - 0 views

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    A prospective nested case-control study of vitamin D status and pancreatic cancer risk in male smokers.
    Stolzenberg-Solomon RZ, Vieth R, Azad A, Pietinen P, Taylor PR, Virtamo J, Albanes D.
    Cancer Res. 2006 Oct 15;66(20):10213-9.
    PMID: 17047087

    Higher vitamin D concentrations were associated with a 3-fold increased risk for pancreatic cancer (highest versus lowest quintile, >65.5 versus <32.0 nmol/L: OR, 2.92; 95% CI, 1.56-5.48, Ptrend = 0.001) that remained after excluding cases diagnosed early during follow-up. Contrary to expectations, subjects with higher prediagnostic vitamin D status had an increased pancreatic cancer risk compared with those with lower status. Our findings need to be replicated in other populations and caution is warranted in their interpretation and implication. Our results are intriguing and may provide clues that further the understanding of the etiology of this highly fatal cancer.

    In conclusion, contrary to expectation, subjects with higher 25(OH)D concentrations were at greater risk for pancreatic cancer compared with those with lower concentrations in our prospective study with long-term follow-up. Caution is warranted in the interpretation and implication of our findings, however, as vitamin D inadequacy is an important public health problem and adequate status is desirable to prevent bone and other diseases (5). Our results, however, are intriguing and may provide clues that further the understanding of the etiology of this highly fatal cancer.
Matti Narkia

How to Optimize Vitamin D Supplementation to Prevent Cancer, Based on Cellular Adaptati... - 0 views

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    How to optimize vitamin D supplementation to prevent cancer, based on cellular adaptation and hydroxylase enzymology.
    Vieth R.
    Anticancer Res. 2009 Sep;29(9):3675-84. Review.
    PMID: 19667164
Matti Narkia

Vitamin D association with estradiol and progesterone in young women - Cancer Causes Co... - 0 views

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    Vitamin D association with estradiol and progesterone in young women.
    Knight JA, Wong J, Blackmore KM, Raboud JM, Vieth R.
    Cancer Causes Control. 2009 Nov 15. [Epub ahead of print]
    PMID: 19916051

    Conclusions Higher levels of vitamin D may reduce progesterone and estradiol, providing a potential mechanism for reduction in breast cancer risk from increased vitamin D exposure in young women
Matti Narkia

Safety of vitamin D3 in adults with multiple sclerosis -- Kimball et al. 86 (3): 645 --... - 0 views

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    Safety of vitamin D3 in adults with multiple sclerosis.
    Kimball SM, Ursell MR, O'Connor P, Vieth R.
    Am J Clin Nutr. 2007 Sep;86(3):645-51.
    PMID: 17823429

    Conclusions: Patients' serum 25(OH)D concentrations reached twice the top of the physiologic range without eliciting hypercalcemia or hypercalciuria. The data support the feasibility of pharmacologic doses of vitamin D3 for clinical research, and they provide objective evidence that vitamin D intake beyond the current upper limit is safe by a large margin.
Matti Narkia

Vitamin D association with estradiol and progesterone in young women. - [Cancer Causes ... - 0 views

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    Vitamin D association with estradiol and progesterone in young women.
    Knight JA, Wong J, Blackmore KM, Raboud JM, Vieth R.
    Cancer Causes Control. 2009 Nov 15. [Epub ahead of print]
    PMID: 19916051

    CONCLUSIONS: Higher levels of vitamin D may reduce progesterone and estradiol, providing a potential mechanism for reduction in breast cancer risk from increased vitamin D exposure in young women.
Matti Narkia

How to Optimize Vitamin D Supplementation to Prevent Cancer, Based on Cellular Adaptati... - 0 views

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    How to optimize vitamin D supplementation to prevent cancer, based on cellular adaptation and hydroxylase enzymology.
    Vieth R.
    Anticancer Res. 2009 Sep;29(9):3675-84. Review.
    PMID: 19667164
Matti Narkia

Vitamin D From Dietary Intake and Sunlight Exposure and the Risk of Hormone-Receptor-De... - 0 views

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    Vitamin D from dietary intake and sunlight exposure and the risk of hormone-receptor-defined breast cancer.
    Blackmore KM, Lesosky M, Barnett H, Raboud JM, Vieth R, Knight JA.
    Am J Epidemiol. 2008 Oct 15;168(8):915-24. Epub 2008 Aug 27.
    PMID: 18756015
    doi:10.1093/aje/kwn198

    This study suggests that vitamin D is associated with a reduced risk of breast cancer regardless of ER/PR status of the tumor. Future studies with a larger number of receptor-negative and mixed tumors are required.
Matti Narkia

Estimates of optimal vitamin D status. - Osteoporos Int. 2005 Jul;16(7):713-6. - Spring... - 0 views

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    Estimates of optimal vitamin D status.
    Dawson-Hughes B, Heaney RP, Holick MF, Lips P, Meunier PJ, Vieth R.
    Osteoporos Int. 2005 Jul;16(7):713-6. Epub 2005 Mar 18.
    PMID: 15776217
Matti Narkia

Epidemic influenza and vitamin D. - Epidemiol Infect. 2006 Dec;134(6):1129-40. (full t... - 0 views

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    Epidemic influenza and vitamin D.
    Cannell JJ, Vieth R, Umhau JC, Holick MF, Grant WB, Madronich S, Garland CF, Giovannucci E.
    Epidemiol Infect. 2006 Dec;134(6):1129-40. Epub 2006 Sep 7. Review.
    PMID: 16959053
Matti Narkia

Cod liver oil, vitamin A toxicity, frequent respiratory infections, and the vitamin D d... - 0 views

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    Cod liver oil, vitamin A toxicity, frequent respiratory infections, and the vitamin D deficiency epidemic.
    Cannell JJ, Vieth R, Willett W, Zasloff M, Hathcock JN, White JH, Tanumihardjo SA, Larson-Meyer DE, Bischoff-Ferrari HA, Lamberg-Allardt CJ, Lappe JM, Norman AW, Zittermann A, Whiting SJ, Grant WB, Hollis BW, Giovannucci E.
    Ann Otol Rhinol Laryngol. 2008 Nov;117(11):864-70. Review.
    PMID: 19102134

    Until we have better information on doses of vitamin D that will reliably provide adequate blood levels of
    25(OH)D without toxicity, treatment of vitamin D deficiency in otherwise healthy children should be individualized
    according to the numerous factors that affect 25(OH)D levels, such as body weight, percent body fat,
    skin melanin, latitude, season of the year, and sun exposure.2 The doses of sunshine or oral vitamin D3 used
    in healthy children should be designed to maintain 25(OH)D levels above 50 ng/mL. As a rule, in the absence
    of significant sun exposure, we believe that most healthy children need about 1,000 IU of vitamin D3 daily
    per 11 kg (25 lb) of body weight to obtain levels greater than 50 ng/mL. Some will need more, and others less.
    In our opinion, children with chronic illnesses such as autism, diabetes, and/or frequent infections should be
    supplemented with higher doses of sunshine or vitamin D3, doses adequate to maintain their 25(OH)D levels
    in the mid-normal of the reference range (65 ng/mL) - and should be so supplemented year round. Otolaryngologists
    treating children are in a good position to both diagnose and treat vitamin D deficiency.
Matti Narkia

Randomized comparison of the effects of the vitamin D3 adequate intake versus 100 mcg (... - 0 views

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    Randomized comparison of the effects of the vitamin D3 adequate intake versus 100 mcg (4000 IU) per day on biochemical responses and the wellbeing of patients.
    Vieth R, Kimball S, Hu A, Walfish PG.
    Nutr J. 2004 Jul 19;3:8.
    PMID: 15260882
    doi:10.1186/1475-2891-3-8

    CONCLUSION: The highest AI for vitamin D brought summertime 25(OH)D to >40 nmol/L, lowered PTH, and its use was associated with improved wellbeing. The 100 mcg/day dose produced greater responses. Since it was ethically necessary to provide a meaningful dose of vitamin D to these insufficient patients, we cannot rule out a placebo wellbeing response, particularly for those on the lower dose. This work confirms the safety and efficacy of both 15 and 100 mcg/day vitamin D3 in patients who needed additional vitamin D.
Matti Narkia

Improved Cholecalciferol Nutrition in Rats Is Noncalcemic, Suppresses Parathyroid Hormo... - 0 views

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    Improved cholecalciferol nutrition in rats is noncalcemic, suppresses parathyroid hormone and increases responsiveness to 1, 25-dihydroxycholecalciferol.
    Vieth R, Milojevic S, Peltekova V.
    J Nutr. 2000 Mar;130(3):578-84.
    PMID: 10702588

    We conclude suppression of 1,25(OH)(2)D and PTH, and higher renal VDR mRNA and 24-hydroxylase did not involve higher free 1,25(OH)(2)D concentration or a first pass effect at the gut. Thus, 25(OH)D or a metabolite other than 1,25(OH)(2)D is a physiological, transcriptionally and biochemically active, noncalcemic vitamin D metabolite.

    When viewed from a perspective that starts with higher vitamin D nutrition, the results indicate that low vitamin D nutrition may bring about a form of resistance to 1,25(OH)2D. This situation would explain why, in humans, nutritional rickets and osteomalacia are commonly associated with normal or increased levels of 1,25(OH)2D (Chesney et al. 1981Citation , Eastwood et al. 1979Citation , Garabedian et al. 1983Citation ,Rasmussen et al. 1980Citation )-these are not like the low hormone levels associated with any other endocrine-deficiency disorder. A connection between lower vitamin D nutrition and vitamin D resistance helps to explain why the supposedly inactive compound 25(OH)D is more relevant in diagnosing nutritional rickets than is the active hormone 1,25(OH)2D.

    If the features of improved vitamin D nutrition shown here were demonstrated for any newly synthesized compound, the compound would be classified as a noncalcemic 1,25(OH)2D analogue (Brown et al. 1989Citation , Finch et al. 1999Citation , Goff et al. 1993Citation , Koshizuka et al. 1999Citation ). Thus, we contend that 25(OH)D or a metabolite of it other than 1,25(OH)2D exists as a physiological and biologically-active noncalcemic vitamin D metabolite whose effects require further examination, particularly in relationship to studies involving the synthetic analogs of 1,25(OH)2D.
Matti Narkia

A Prospective Nested Case-Control Study of Vitamin D Status and Pancreatic Cancer Risk ... - 0 views

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    A prospective nested case-control study of vitamin D status and pancreatic cancer risk in male smokers.
    Stolzenberg-Solomon RZ, Vieth R, Azad A, Pietinen P, Taylor PR, Virtamo J, Albanes D.
    Cancer Res. 2006 Oct 15;66(20):10213-9.
    PMID: 17047087
    doi: 10.1158/0008-5472.CAN-06-1876

    Contrary to expectations, subjects with higher prediagnostic vitamin D status had an increased pancreatic cancer risk compared with those with lower status. Our findings need to be replicated in other populations and caution is warranted in their interpretation and implication. Our results are intriguing and may provide clues that further the understanding of the etiology of this highly fatal cancer.
Matti Narkia

Vitamin K Supplementation in Postmenopausal Women with Osteopenia (ECKO Trial): A Rando... - 0 views

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    Vitamin K supplementation in postmenopausal women with osteopenia (ECKO trial): a randomized controlled trial.
    Cheung AM, Tile L, Lee Y, Tomlinson G, Hawker G, Scher J, Hu H, Vieth R, Thompson L, Jamal S, Josse R.
    PLoS Med. 2008 Oct 14;5(10):e196. Erratum in: PLoS Med. 2008 Dec;5(12):e247.
    PMID: 18922041

    CONCLUSIONS: Daily 5 mg of vitamin K1 supplementation for 2 to 4 y does not protect against age-related decline in BMD, but may protect against fractures and cancers in postmenopausal women with osteopenia. More studies are needed to further examine the effect of vitamin K on fractures and cancers. Trial registration: ClinicalTrials.gov (#NCT00150969) and Current Controlled Trials (#ISRCTN61708241)
Matti Narkia

Vitamin D toxicity, policy, and science. - JBMR Online - Journal of Bone and Mineral Re... - 0 views

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    Vitamin D toxicity, policy, and science.
    Vieth R.
    J Bone Miner Res. 2007 Dec;22 Suppl 2:V64-8. Review.
    PMID: 18290725
    doi: 10.1359/jbmr.07s221
Matti Narkia

Unusually prolonged vitamin D intoxication after discontinuation of vitamin D: possible... - 0 views

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    Unusually prolonged vitamin D intoxication after discontinuation of vitamin D: possible role of primary hyperparathyroidism.
    Taskapan H, Vieth R, Oreopoulos DG.
    Int Urol Nephrol. 2008;40(3):801-5. Epub 2008 Jun 5.
    PMID: 18528779
    DOI: 10.1007/s11255-008-9404-1
Matti Narkia

Vitamin D poisoning by table sugar : The Lancet - 0 views

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    Vitamin D poisoning by table sugar.
    Vieth R, Pinto TR, Reen BS, Wong MM.
    Lancet. 2002 Feb 23;359(9307):672.
    PMID: 11879864
    doi:10.1016/S0140-6736(02)07814-5
Matti Narkia

Vitamin D and Cancer Mini-Symposium: The Risk of Additional Vitamin D - 0 views

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    Vitamin D and cancer mini-symposium: the risk of additional vitamin D.
    Vieth R.
    Ann Epidemiol. 2009 Jul;19(7):441-5. Epub 2009 Apr 11. Review.
    PMID: 19364661

    Conclusion

    The results of well-conducted trials of vitamin D lead to the conclusion that the current U.S. National Academy of Sciences-Institute of Medicine upper limit for vitamin D intake of 2000IU per day 1, 37 is excessively conservative. That intake would raise serum 25(OH)D by an average of about 50 nmol/L (20 ng/mL), well within the safe range of serum 25(OH)D concentrations that extends to 500 nmol/L (200 ng/mL). Intake of 4,000IU per day would raise serum 25(OH)D by an average of about 100 nmol/L (40 ng/mL). Even prolonged physiologic-replacement intake of 10,000IU per day of vitamin D3 would pose no known risk of adverse effects in virtually all adults.
Matti Narkia

Age-Related Changes in the 25-Hydroxyvitamin D Versus Parathyroid Hormone Relationship ... - 0 views

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    Age-related changes in the 25-hydroxyvitamin D versus parathyroid hormone relationship suggest a different reason why older adults require more vitamin D.
    Vieth R, Ladak Y, Walfish PG.
    J Clin Endocrinol Metab. 2003 Jan;88(1):185-91.
    PMID: 12519850

    This study shows that all age groups exhibit a high prevalence of 25(OH)D insufficiency and secondary hyperparathyroidism. Older adults are just as efficient in maintaining 25(OH)D, but they need more vitamin D to produce the higher 25(OH)D concentrations required to overcome the hyperparathyroidism associated with their diminishing renal function
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