01-04-2020, 08:38 PM
(26-12-2018, 12:16 PM)Davi da Real Escreveu: @electro Dei uma pesquisada na net e não encontrei muita coisa referente a minha dúvida. O banho com sabonete prejudica a absorção de vitamina D logo após o banho de sol ou em qualquer horário do dia?
Achei esta informação em um site sobre... menopausa.
https://www.menopausewhisperer.com/how-t...vitamin-d/
Cholesterol-containing body oils are critical to this absorption process. Because the body needs 30-60 minutes to absorb these vitamin-D-containing oils (once it is absorbed from the suns UVB rays), it is best to delay showering or bathing for one hour after exposure. The skin oils in which vitamin D is produced can also be removed by chlorine in swimming pools.
Mas é um site "genérico".
Este outro aqui se baseia em um estudo de... 1937.
https://losethebackpain.com/taking-showe...eficiency/
The take-home message is this: if you’ve been out in the sun for an hour or two, resist the urge to take a shower right after you get home – even if you were exercising. Instead, give your body time to absorb the valuable vitamin D precursors on the surface of your skin before you wash them away with soap and water.
Este aqui baseia numa comunidade do Feice:
https://www.iamexpat.nl/lifestyle/lifest...-vitamin-d
Taking a shower using soap within 48 hours after sun exposure or washing your entire body with soap can reduce the vitamin D absorption rate, according to The Natural Society.
E finalmente, outra pessoa que perguntou a mesma coisa:
https://www.quora.com/Where-is-the-scientific-literature-that-supports-the-commonly-cited-ideas-that-Vitamin-D-from-UVB-rays-can-be-washed-off-the-skin-with-soap-and-that-it-takes-up-to-48-hours-to-absorb-through-the-skin
Where is the scientific literature that supports the commonly cited ideas that Vitamin D from UVB rays can be washed off the skin with soap, and that it takes up to 48 hours to absorb through the skin?
There is no scientific evidence to prove it. But this doesn't stop so-called experts on the internet from repeating this fable, sometimes with convincing reasoning, but without any research or experiments to confirm their claims. Instead they have reasons galore, namely the conflict of interest. that is reasons to peddle their wares. (£££££!!!)
There is not much research on this topic either. One of the leading vitamin D experts, Michael Holick, MD, PhD, suggests that vitamin D is made inside skin cells and therefore would not be washed off during a shower.
Esta pesquisa aqui diz que não:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3897598/
Photochemistry of Provitamin D3
During exposure to sunlight solar radiation with wavelengths of 290–315 nm penetrate into the skin and are absorbed by proteins, DNA and RNA as well as 7-dehydrocholesterol.1,2 Most of this UVB radiation is absorbed in the epidermis and as a result when exposed to sunlight most of the vitamin D3 that is produced in the skin is made in the living cells in the epidermis. This is the reason why after exposure to sunlight vitamin D3 remains in the skin even when the skin is washed with soap and water immediately after the exposure to sunlight.
Sou mais essa pesquisa científica. Como é que vai "metabolizar" algo fora da pele, se a epiderme é uma "casca" de células queratinizadas feita pra isolar o que tem dentro do que tem fora...
