The importance of vitamin: d
You may have heard people talking about taking vitamin D supplements and wondered whether you should do the same or whether it was just another vitamin.
During the past couple of years, vitamin D research has increased, thus increasing our knowledge of this important nutrient, which is actually a hormone and not a vitamin. The research has found that a large percentage of our population is deficient in vitamin D, and at Pee Dee Family Practice we have found upwards of 90 percent of our population is deficient.
So what does this deficiency mean for you? How do you find out what your level is? And how is it corrected?
This hormone interacts with more than 2,000 genes affecting the brain, skin, heart, prostate, mammary glands, digestive tract, parathyroid gland, immune regulation, bone health, diabetes, fibromyalgia, depression, cognitive impairment and cancer. Low levels of vitamin D are related to a higher incidence of atherosclerosis, coronary artery calcification, cardiovascular events, hypertension and mortality. Vitamin D levels below 40 are associated with upper respiratory infections and the flu.
Studies indicate that vitamin D can lead to a 50 percent reduction in colon cancer and 30 percent reduction in breast cancer, to name a few. It may also relieve unexplained body aches, manage osteopenia and osteoporosis, and make it easier to loose weight. Vitamin D also increases muscle strength, making it important to help prevent falls, while some use it for athletic enhancement.
If you are pregnant, vitamin D may prevent your infant from having asthma, allergies, autism, juvenile diabetes, infectious diseases and low birth weight. If you have any of these conditions, your health-care provider can order a blood test to determine your vitamin D level.
A simple blood test is the only way to determine your vitamin D levels. There are two types of vitamin D levels, but the correct test is called 1, 25-dihydroxyvitamin D. You are more likely to be vitamin D deficient if you have kidney failure or liver failure, use sunscreen, have dark skin, or stay inside.
According to the new research, your vitamin D level should be above 40 for bone health and 45 to obtain cardiovascular benefits, and still others say over 50 for cancer prevention. If your levels are below these levels, you will need to discuss with your provider whether to naturally correct it or supplement with vitamin D.
Naturally, we convert UVB sun rays into vitamin D through our skin. UVB rays are easily reflected, making it difficult for them to reach the Earth and your skin. This conversion of UVB to vitamin D is subject to many factors including latitude, season, time of day, pollution, weather conditions, skin pigmentation, age, sunscreen, shade and clothing.
For those of us in South Carolina, adequate exposure to UVB occurs between 11 a.m. and 2 p.m. in late spring through early fall while arms and legs are exposed to the sun without shade, clothing, windows and pollution. With just 15 minutes of exposure, you get about 20,000 IU (international units) of vitamin D.
If you remain outside and your skin becomes pink or the time of day is beyond the UVB range, however, you will decrease your vitamin D levels by exposing yourself to UVA rays. Therefore, you must apply sunscreen after the initial 15 minutes in the sun to keep your vitamin D levels optimal and prevent sunburns.
Another way to obtain vitamin D is through food and supplementation. Naturally, vitamin D is found in cod liver oil, sardines and dairy products. The Food and Drug Administration states that you need only 400 IU daily, but by following this recommendation, our population has become deficient, the research shows.
If you are vitamin D deficient, you would have to drink over 50 glasses of milk a day. Since this amount of milk would be expensive and cause other uncomfortable problems, your provider may prescribe vitamin D at 50,000 IU. While taking supplementation to correct your levels, your blood levels should be monitored to ensure they stay in the optimal range. Then, once your levels are corrected, you can take over-the-counter vitamin D3 (cholecalciferol) ranging between 2,000 and 5,000 IU daily. The American Academy of Pediatrics recommends for infants to receive 400 IU daily and for breastfeeding mothers to take 2,000 IU daily.
As the research continues, I am sure that more medical conditions will be related to vitamin D and that the proper vitamin D blood levels will also become more well defined. Please consult and work with your health-care provider as you learn and seek to correct your vitamin D levels.