Do You Know How Much Vitamin D Your Body Needs?
Two thirds of the world’s population, including about half the people in North America and Western Europe, get an insufficient supply of vitamin D, according to vitamin D expert Anthony Norman, PhD.
His article appeared in the July, 2010 issue of Endocrine Today, a monthly newspaper about diabetes and endocrine disorders. Several studies have reported reduced risks of breast cancer, colon cancer and type 1 diabetes with adequate levels of vitamin D, the positive effect generally occurring within five years of beginning to get an adequate vitamin D intake, writes Norman.
It was Norman’s lab that discovered, in 1967, that vitamin D is converted by the body into a steroid hormone; and later discovered that 37 body organs respond to it biologically.
Vitamin D is found in very few foods naturally – fish, eggs and cod liver oil – which is why some other foods such as milk, orange juice, some yogurts and some breakfast foods are fortified with it.
Currently, the recommended daily intake of vitamin D is:
- 200 international units (IU) for people up to 50 years old;
- 400 IU for people 51 to 70 years old; and
- 600 IU for people over 70 years old.
But many scientists suggest that amounts as high as 2,000 to 4,000 IU are required for optimal health, levels which cannot be achieved through food alone; a combination of food, sunshine and supplements may be needed to achieve these levels.
Can Fish Oil Reduce Risk of Breast Cancer?
A study of 35,016 postmenopausal women with no history of breast cancer has found fish oil supplements may reduce the risk of this disease by 32 percent.
The study looked only at “specialty” supplements taken by each subject, those that did not fall into the category of vitamins or minerals.
The risk of invasive ductal breast cancer – the most common type of the disease – was shown to be reduced in those taking fish oil supplements, which contain high levels of the omega-3 fatty acids, EPA and DHA. None of the other “specialty” supplements, commonly taken for menopausal symptoms, showed any association to breast cancer. Previous studies of dietary omega-3 oils or fish provided conflicting results. This study’s researchers speculate fish oil supplements may contain much higher amounts of omega-3 fatty acids than are normally consumed in even an omega-3-rich diet and this could explain the difference in findings between supplements and diet.
A brief summary was released (12:05am ET, July 8, 2010) by the journal, Cancer Epidemiology, Biomarkers & Prevention; but the full study will not be published until a future issue of the journal.