Jump to content

Talk:Vitamin D

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia


Production from sunlight

[edit]

I What to add this two sections Production from sunlight and Absorption in the body from the sun. I have tried after best ability to follow WP:MEDRS.

To convey the difficulties, with getting vitamin D from the sun. And that getting vitamin D from sun/previtamin D is a different from supplement.


Production from sunlight

[edit]
Finse: 60°N and 1220 m AMSL
Oslo, Bergen 60°N and 0 m AMSL,
Tromsø 69°N and 0 m AMSL,
Ny-Ålesund 78°N and 0 m AMSL.
Maximum UV index and how it varies throughout the year in Norway.

To produce Vitamin D, UVB light is required. To have sufficient light containing UVB, the UV index needs to be 3 or higher (≥45 solar zenith angle at sea level).[1] Vitamin D production is maximal at one-third of the minimal erythemal dose. When UV exposure increases to a minimal erythemal dose, vitamin D synthesis stops.[2] One must be south of latitude 50°N to produce vitamin D around the Winter solstice.[3]

Number of minutes at different UV levels to achieve sufficient monthly needs[4][5]
SKIN REACTION TO SUNLIGHT UV INDEX
0-2 3-5 6-7 8-10 11+
Skin type I:

Always burn, never tan

56-∞ 10-15 5-10 2-8 1-5
Skin type II:

Burn easily, rarely tan

80-∞ 15-20 10-15 5-10 2-8
Skin type III:

Occasionally burn, slowly tan

90-∞ 20-30 15-20 10-15 5-10
Skin type IV:

Rarely burn, rapidly tan

140-∞ 30-40 20-30 15-20 10-15
Skin type V & VI:

Very rarely burn, always dark

180-∞ 40-60 30-40 20-30 15-20

The table assumes that one is outdoors in sunlight for more than 3 times a week, wearing only swim trunks and a t-shirt or swimsuit, and has not applied sunscreen. Such exposure to the entire skin surface corresponds to receiving between 250–1250 μg of vitamin D (10k to 50k IU) per session[6], or a similar amount as obtained by consuming 125–500 ml of cod liver oil (200μg/100ml[7]).

The "summer level" decreases to "winter level" within 6 to 8 weeks after insufficient sun exposure, without supplementation.[8]

Barriers to UVB absorption:

[edit]
  • Sunscreen
  • Clothing covering a larger area
  • Overcast skies
  • Staying in the shade
  • Insufficient UV index.

Secondary sources

[edit]

@EidenNor:, per WP:MEDRS, secondary sources (review articles) and preferably recent reviews (less than five years old) are needed to support medical claims. Unfortunately most of the sources provided above are primary. The following are secondary, but more than ten years old.[9][10][11] Please refer to the banner on this talk page ("Ideal sources for Wikipedia's health content") for a link that will identify such sources. For the subject of vitamin D, there are thousands of such recent review articles. Thank you. Boghog (talk) 05:51, 30 April 2024 (UTC)[reply]

Hi @Boghog, it looks like you care a lot about the vitamin D article, and wants to make it best you can. That is something we both are aiming to do.
I agree secondary sources (review articles) and recent review are preferred. I agree that the sources are old, and agree there is many review articles.
Does the source being old make them bad? no. Does it being primary sources make them wrong? no.
Basted on what i read, the subject is undisputed, and taken for grated, and therefor not not part of review articles, like Vitamin D: The “sunshine” vitamin.
I have been unable to fined a review articles focusing on the timeline of vitamin D absorbing, in the 0-8 weeks from 1-5 MED, in high resolution.
Other that not be WP:MEDRS what is preferred, do you have any other objections? EidenNor (talk) 17:26, 1 May 2024 (UTC)[reply]

References

  1. ^ Kallioğlu, Mehmet Ali; Sharma, Ashutosh; Kallioğlu, Ayşan; Kumar, Sunil; Khargotra, Rohit; Singh, Tej (2024-02-12). "UV index-based model for predicting synthesis of (pre-)vitamin D3 in the mediterranean basin". Scientific Reports. 14 (1): 3541. doi:10.1038/s41598-024-54188-5. ISSN 2045-2322. PMID 38347060.
  2. ^ "Benefits and Risks of Sun Exposure to Maintain Adequate Vitamin D Levels". PubMed Central. 2023-05-05. {{cite journal}}: Unknown parameter |authors= ignored (help)
  3. ^ "Vitamin D and UV". Science Learning Hub. Retrieved 2024-04-05.
  4. ^ "Get Vitamin D from Sun Exposure". www.gbhealthwatch.com. Retrieved 2024-04-23.
  5. ^ "Calculated Ultraviolet Exposure Levels for a Healthy Vitamin D Status and no sunburn". fastrt.nilu.no. Retrieved 2024-04-23.
  6. ^ "Benefits of Sunlight: A Bright Spot for Human Health". PubMed Center. March 2008. Retrieved 2024-03-24. {{cite web}}: Unknown parameter |authors= ignored (help)
  7. ^ stok (2017-10-11). "Tran og Vitamin D - Kilder og tilskudd - Möller's". Møllers (in Norwegian Bokmål). Retrieved 2024-03-09.
  8. ^ Cicarma, Emanuela; Porojnicu, Alina Carmen; Lagunova, Zoya; Dahlback, Arne; Juzeniene, Asta; Moan, Johan (2009-09-01). "Sun and sun beds: inducers of vitamin D and skin cancer". Anticancer Research. 29 (9): 3495–3500. ISSN 1791-7530. PMID 19667143.
  9. ^ Holick MF (March 2004). "Vitamin D: importance in the prevention of cancers, type 1 diabetes, heart disease, and osteoporosis". The American Journal of Clinical Nutrition. 79 (3): 362–371. PMID 14985208.
  10. ^ Holick MF (2009). "Vitamin D and Health: Evolution, Biologic Functions, and Recommended Dietary Intakes for Vitamin D.". Clinical Reviews in Bone and Mineral Metabolism. 1 (7): 2–19. doi:10.1007/s12018-009-9026-x.
  11. ^ Holick MF (August 2011). "Vitamin D: a d-lightful solution for health". Journal of Investigative Medicine. 59 (6): 872–880. PMID 21415774.

Add A Fact: "Vitamin D requirement for infants"

[edit]

I found a fact that might belong in this article. See the quote below

Babies up to the age of 1 year need 8.5 to 10 micrograms of vitamin D a day.

The fact comes from the following source:

https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/

Here is a wikitext snippet to use as a reference: 

 {{Cite web |title=Vitamin D |url=https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/ |website=nhs.uk |date=2017-10-23 |access-date=2024-09-27 |language=en |quote=Babies up to the age of 1 year need 8.5 to 10 micrograms of vitamin D a day.}}

This post was generated using the Add A Fact browser extension.

Icairns 2 (talk) 13:47, 27 September 2024 (UTC)[reply]

The information is provided under Dietary intake. Zefr (talk) 16:47, 27 September 2024 (UTC)[reply]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Talk:Vitamin_D&oldid=1248245363"