Vitamine D voorkomt het ontstaan van kanker met wel 77%!!*
Wat sommige onderzoekers al dachten blijkt nu in een clinical trial bewezen te zijn: voldoende vitamine D kan het ontstaan van kanker voor een groot gedeelte voorkomen. Voldoende vitamine D betekent wel drie keer de aanbevolen dagelijkse hoeveelheid. In de studie kregen bijna 1.200 vrouwen van 55 jaar en ouder vier jaar lang of een 1.500 mg calcium supplement of een 1.500 mg calcium + 27,5 mcg vitamine D supplement of een placebo. Na 4 jaar bleek dat vrouwen met het vitamine D supplement fors minder kans hadden op kanker dan vrouwen die geen vitamine D gekregen hadden. Omdat het mogelijk was dat bij het begin van de studie sommige vrouwen al een niet vastgestelde kanker hadden werd voor de uiteindelijke resultaten het eerste jaar weggelaten. Na die drie jaar bleek dat vrouwen in de vitamine D groep 77% minder kans hadden op het krijgen van borst, long, darm of andere vorm van kanker. Er waren nauwelijks verschillen in de kans op kanker tussen de alleen calcium groep of placebo groep.
Alhoewel het lichaam onder invloed van zonlicht zelf vitamine D kan aanmaken is voeding rijk aan vitamine D en supplementering vereist. Normaal is er een half jaar niet voldoende zon en teveel zon kan weer zorgen voor het ontstaan van huidkanker, terwijl zonnecrèmes de aanmaak van vitamine D weer tegengaan.
New
research shows vitamin D slashes risk of cancers by 77 percent
Most Americans and others are not taking enough vitamin
D, a fact that may put them at significant risk for developing cancer, according
to a landmark study conducted by Creighton University School of Medicine.
The four-year, randomized study followed 1,179 healthy, postmenopausal women
from rural eastern Nebraska.* Participants taking calcium, as well as a quantity
of vitamin D3 nearly three times the U.S. government's Recommended Daily Amount
(RDA) for middle-age adults, showed a dramatic 60 percent or greater reduction
in cancer risk than women who did not get the vitamin.
The results of the study, conducted between 2000 and 2005, were reported in the
June online edition of the American
Journal of Clinical Nutrition.
"The findings are very exciting. They confirm what a number of vitamin D
proponents have suspected for some time but that, until now, have not been
substantiated through clinical trial," said principal investigator Joan
Lappe, Ph.D., R.N., Creighton professor of medicine and holder of the Criss/Beirne
Endowed Chair in the School of Nursing. "Vitamin D is a critical tool in
fighting cancer as well as many other diseases."
Other Creighton researchers involved in the study included Robert Recker, M.D.;
Robert Heaney, M.D.; Dianne Travers-Gustafson, M.S.; and K. Michael Davies, Ph.D.
Research participants were all 55 years and older and free of known cancers for
at least 10 years prior to entering the Creighton study. Subjects were randomly
assigned to take daily dosages of 1,400-1,500 mg supplemental calcium,
1,400-1,500 mg supplemental calcium plus 1,100 IU of vitamin D3, or placebos.
National Institutes of Health funded the study.
Over the course of four years, women in the calcium/vitamin D3 group experienced
a 60 percent decrease in their cancer risk than the group taking placebos.
On the premise that some women entered the study with undiagnosed cancers,
researchers then eliminated the first-year results and looked at the last three
years of the study. When they did that, the results became even more dramatic
with the calcium/vitamin D3 group showing a startling 77 percent cancer-risk
reduction.
In the three-year analysis, there was no statistically significant difference in
cancer incidence between participants taking placebos and those taking just
calcium supplements.
Through the course of the study, 50 participants developed nonskin cancers,
including breast, colon, lung and other cancers.
Lappe said further studies are needed to determine whether the Creighton
research results apply to other populations, including men, women of all ages,
and different ethnic groups. While the study was open to all ethnic groups, all
participants were Caucasian, she noted.
There is a growing body of evidence that a higher intake of vitamin D may be
helpful in the prevention and treatment of cancer, high blood pressure,
fibromyalgia, diabetes mellitus, multiple sclerosis, and rheumatoid arthritis
and other diseases.
Humans make their own vitamin D3 when they are exposed to sunlight. In fact,
only 10-15 minutes a day in a bright summer sun creates large amounts of the
vitamin, Lappe said. However, people need to exercise caution since the sun's
ultraviolet B rays also can cause skin cancer; sunscreen blocks most vitamin D
production.
In addition, the latitude at which you live and your ancestry also influence
your body's ability to convert sunlight into vitamin D. People with dark skin
have more difficulty making the vitamin. Persons living at latitudes north of
the 37th parallel -- Omaha is near the 41st parallel -- cannot get their vitamin
D naturally during the winter months because of the sun's angle. Experts
generally agree that the RDA** for vitamin D needs to be increased substantially,
however there is debate about the amount. Supplements are available in two forms
-- vitamin D2 and vitamin D3. Creighton researchers recommend vitamin D3,
because it is more active and thus more effective in humans.
* Study participants came from the Nebraska counties of Douglas, Colfax, Cuming,
Dodge, Saunders, Washington, Sarpy, Burt and Butler. ** RDA recommendations for
vitamin D are 200 IU/d, birth-age 50; 400 IU/d, 50-70 years; and 600 IU/d, 70
years and older. (Juni 2007) (Opm.
Al veel onderzoeken laten de grote voordelen van vitamine D zien in het
voorkomen en behandelen van kanker en andere ziektes waaronder hoge bloeddruk,
diabetes, MS en RA. Toch heeft het merendeel van de bevolking te lage
bloedwaarden vitamine D en zijn de aanbevolen dagelijkse hoeveelheid nog altijd
te laag. Vitamine D zal wel te goedkoop zijn zo lijkt het althans in Amerika
waar men zeker niet afwil van de zeer lage aanbevolen dagelijkse hoeveelheden
dit in tegenstelling tot Canada waar inmiddels voorstellen liggen om die
hoeveelheden flink te verhogen en waar de overheid al overweegt voeding extra
met vitamine D te verrijken. Het zal de vraag zijn wie de strijd hier wint, de
overheid of de farmaceutische industrie. U hoeft daar niet op te wachten en kunt
vandaag met extra vitamine D beginnen.)