Benefits of vitamin D: weight control and protection against tumors
It has been frequent news for the benefits it brings to the body. Vitamin D is the staple of scientific studies, suggesting its power to fight blood pressure, control weight and ward off the risk of tumors. "Vitamin D can be found in milk, salmon, sardines, fish liver oil, mushrooms, eggs and some cereals that are fortified with this vitamin," explains nutritionist Cristiane Mara Cedro.
However, a good way maintaining adequate levels of this vitamin is sunbathing 10 to 15 minutes twice a day as sunlight is a major source of nutrient absorption. The person responsible for this stimulus is none other than the UVB ray. In other words, although dangerous in exaggerated doses, UVB is indeed necessary for health. "At some times the exposure to sunlight is less, which is detrimental to vitamin D synthesis," says dermatologist Daniela Taniguchi. Thus, it is important for people with limited exposure to the sun to include good sources of Vitamin D in the diet.
The intake recommended by U.S. Dietary Reference Intake for children and adults up to 50 years old is five micrograms per day (200 IU / day). The recommendation increases to 10 micrograms / day (400 IU / day) for people between 50-71 years of age and 15 micrograms / day for the elderly over 70 years.
In addition to being vital for regulating blood pressure, keeping the nervous system on the rails, vitamin D works to absorb calcium and phosphorus. "It is essential for the maintenance of calcium metabolism, which acts on bone development," explains nutritionist Roberta Stella, about her indirect contribution to fighting osteoporosis. So much that, in lack, it can lead to infantile rickets, deformity in the bones and the short stature. Adults with vitamin deficiency suffer from osteomalacia, a disease characterized by softening of the bones and deformity. This vitamin still participates in cell differentiation and inhibits the proliferation of cells. Together with the mutation, cell proliferation can lead to diseases such as cancer.
Vitamin D also strengthens our autoimmune system and acts on the secretion of insulin. Some studies suggest that vitamin deficiency may lead to impairment in the secretion of this hormone, which could cause glucose intolerance. Vitamin D is produced in the skin but is activated by the kidneys. "Patients with kidney failure need supplements of this vitamin," according to nutritionist Cristiane Mara Cedro.
The importance of vitamin
Vitamin D - Photo: Getty Images
Vitamin D is also important in the fight against blood pressure , according to researchers at the University of Michigan in the United States, this is because Vitamin D is primarily responsible for controlling the stiffening of arteries that elevates the pressure in women. With the lack of the vitamin, the female organism makes a three times greater effort to maintain its circulatory balance and ends up overloading some functions like the irrigation of the arteries, which generates an increase in the pressure and discomforts, like dizziness and excessive perspiration. Nutrient deficiency is also associated with depression. Researchers at Vrije University in the Netherlands studied 1,282 people between the ages of 65 and 95, of whom 169 had mild depression. The rate of vitamin D in depressed people was 14% lower than that observed in other elderly people, according to the study. Unifesp endocrinologist Pedro Saddi explains that lack of vitamin D increases the level of the parathyroid hormone called PTH. "This hormone has an indirect link with changes in mood and apathy, which are symptoms associated with depression," says the doctor.Another study, published in the scientific publication
Archives of Internal Medicine
, indicates that people with low vitamin D levels appear to be at greater risk of dying. Several diseases were identified as causing the deaths. The authors suggest that low levels of vitamin D are associated with death because of their effect on blood pressure and the body's ability to respond to insulin. They also associate vitamin deficiency with obesity and diabetes. In a November 2008 article in the
The Journal of Clinical Endocrinology & Metabolism , researchers reported that girls in the post-pubertal stage, who have low levels of Vitamin D, gained weight and had atrophied growth. Ninety girls aged 16 to 22 years were evaluated for height, weight, body fat, bone density and vitamin D levels. In 59% of the girls, vitamin deficiency was detected. These demonstrated weight gain, body mass and body fat, and tended to be lower than girls with sufficient levels of vitamin. Risks of disability
Another research conducted by the Rochester University Medical Center in the United States United States, suggests that the lack of Vitamin D in the body may harm the treatment of patients with breast cancer. The study involved approximately 200 women undergoing chemotherapy. After a few tests, the scientists found that 70% of volunteers whose treatment results were compromised had low vitamin content in the blood. Vitamin D deficiency can cause problems of urinary and fecal incontinence in women. A recent study by the National Health and Nutrition Examination Survey in the United States found the link between vitamin D levels and pelvic disorders, analyzing more than 1,800 women over the age of 20. The results showed that 82% of the women had levels of Vitamin D considered insufficient by the doctors. At least one of the pelvic disorders was reported by 23% of women and mean levels of vitamin D were significantly lower among those with disorders such as urinary incontinence, genital prolapse (known as "fallen bladder"), and fecal incontinence. In older women, the risk of urinary incontinence was 45% lower among those with satisfactory levels of vitamin D.
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