I-Vitamin D iyisidlo esibalulekile esilawula izenzo eziningana zomzimba zomzimba. I-Vitamin D ikhiqizwa ezindaweni ezijulile zesikhumba besebenzisa amandla avela elangeni. Ngenxa yokuthi umzimba ungenza i-vitamin D, akubhekwa njengowomzimba "obalulekile," noma ingxenye enkulu yevithamini D edingekayo ngomzimba womuntu ivela ekudleni.
I-Vitamin D, esebenza nge-hormone ephathekayo, ngokuyinhloko ibhekene nokulawula inani le-calcium ne-phosphorus egazini. I-Vitamin D iphinde ikhuthaze ukwakhiwa kwamathambo esithambo futhi iyaziwa ukugqugquzela ukukhiqizwa kwamangqamuzana omzimba omzimba.
Ucwaningo oluthakathaka luveza ukuthi i- vitamin D ingase idale indima ekulawulweni komfutho wegazi kanye nempilo yenhliziyo . Kuyaziwa, isibonelo, ukuthi amacala egazi eliphezulu akhula ngesikhathi sasebusika nasezindaweni eziqhubekayo ukusuka e-equator - zombili izimo lapho ukwehla kwelanga kutholakala ekukhiqizeni okuncane kwe-vitamin D.
I-Vitamin D Ingavimbela Ukucindezeleka Kwegazi Eliphakeme?
Mhlawumbe - ubufakazi abucaci ngokuphelele. Nakuba indima ye-vitamin D ekucindezelweni kwegazi kanye nempilo ye-heart bekuyihloko yokuphenywa okukhulu kusukela okungenani maphakathi nawo-1980, iziphetho zocwaningo zocwaningo zinzima ukuzihumusha.
Nakuba kuyaziwa ukuthi kokubili imithambo yegazi nenhliziyo inamanani amaningi kavithamini D receptors - okusho ukuthi i-vitamin D inikeza umsebenzi othile ekulawuleni lezi zinkinga - ukuhlola ukuthi yini lezi zitholampilo ezenzayo kube nzima. Izifundo ezenzweni zika vithamini D ngezinye izikhathi zibonakala ziphikisana, futhi ngezinye izikhathi ziveza idatha engakwazi ukuhunyushwa ngokunembile.
Ucwaningo olulodwa lwathola ukuthi ukuphatha i-vitamin D kubantu abadala asebekhulile benomshanguzo wegazi ophezulu okwenzeke kokubili kubangele ukucindezeleka kwegazi kanye ne- diastolic yegazi ukunciphisa. Isifundo esifanayo sathola nokuthi ukunikeza kokubili i-vitamin D ne-calcium ndawonye kubangele ngisho nokwehla okukhudlwana kokubili kwegazi kanye ne-diastolic yegazi . Le datha ibonisa ukuthi ngandlela-thile i-vitamin D ne-calcium basebenzisana ndawonye ukuze kubangele ukuncipha kwengcindezi yegazi nokuthi amazinga aphezulu e-calcium akhuthaza isenzo sokunciphisa i-vitamin D. isenzo segazi. Kodwa-ke, ngokudabukisayo, lapho abahlanganyeli becwaningo behlolwe ngokucophelela, itholakala ukuthi lokhu kuphela kwasebenza kubantu abanamazinga aphakeme kakhulu e-calcium ukuqala. Kubantu ababenamazinga aphansi e-calcium ekuqaleni, noma i-vitamin D noma i-vitamin D kanye ne-calcium yayisebenza kahle ekunciphiseni ukucindezelwa kwegazi.
Lezi zithole zenziwe ngisho nokudideka ngokwengeziwe ngesifundo esilandelayo esibonakala sengathi sibonisa ukuthi amazinga aphezulu e-calcium ahlobene nengozi yokuthuthukisa izinkinga zenhliziyo, kuhlanganise nokucindezelwa kwegazi eliphezulu. Lolu cwaningo luhlolisise iqembu elilinganiselwe leziguli futhi lithola ukuthi amazinga e-calcium, ama- glucose namazinga e- cholesterol ayebonakala ephakama ndawonye.
Okusho ukuthi, abantu abane-cholesterol ephakeme -ebalulekile engozini ye-cardiovascular factor - nabo babonakala benamazinga aphezulu e-calcium. Ukutadisha okufanayo kwabonisa futhi ukuxhumana phakathi kwe-calcium ephezulu ne-high blood pressure. Njengoba amazinga e-calcium aphakama, ukucindezeleka kwegazi kwavame ukuphakama.
Ukucabanga ngalezi zifundo ezimbili ndawonye kuyisibonelo esihle sokuba kungani isithombe se-vitamin D singacacile. Uma amazinga aphezulu e-calcium ahlotshaniswa nengcindezi ephezulu yegazi , kungani-ke ukunikeza abanye abantu abanegazi eliphezulu, ngisho nangaphezulu, i-calcium (kanye ne-vitamin D) kubangele ukucindezeleka kwegazi?
Muva nje, abacwaningi baye bakwazi ukuhlanganisa izimpendulo ezithile kule mibuzo ephazamisayo.
Idatha ebonakalayo ephikisanayo etholakala ezifundweni eziningi zika vithamini D ingase ibe ngumphumela wokusebenza kwezinso zezinso. Esinye isifundo esibalulekile sibonise ukuthi isenzo se-vitamin D sibonakala sishintsha ngokusekelwe emsebenzini wezinso nesenzo se- renin-angiotensin system . Njengoba abantu abanomfutho wegazi ophezulu bangase bahlakulele ukusebenza kwezinso, futhi kungenzeka ukuthi banesimiso sokungasebenzi kahle kwe-renin-angiotensin, ukucwaninga kwangaphambilini kungase kungaphikisani nhlobo.
Nakuba kucacile ukuthi i-vitamin D idlala indima ethile ekulawuleni ukucindezelwa kwegazi, nokuthi abantu abanezinga eliphansi levithamini D banamathuba amaningi okuthuthukisa izinkinga zenhliziyo, isimo esiqondile salobudlelwane obuyinkimbinkimbi kufanele sisebenze ngaphambi kokuba isithombe ukuqedela.
Kufanele Ngithathe Izithako Zamavithamini D Omlomo?
Cha. Akekho ubufakazi obusikisela ukuthi isilwane se-vitamin D somlomo sinikeza noma yimuphi umphumela wokuzivikela ekubhekaneni negazi eliphezulu noma isifo senhliziyo. Ubufakazi kuze kube manje bukhomba ukuthi imithombo yokudla ye-vitamin D yanele ukugwema izimo "eziphansi" ezihambisana nalesi sifo. Kubantu abadala, abanempilo enhle, ukudla okulinganiselayo kunganikeza uvithamini D. okwanele Abantu abanokuntuleka kwevithamini D okubhaliwe bangadinga ukwesekwa komlomo, kodwa lokhu akusizathu sezizathu zenhliziyo.
Isabelo samanje se-vitamin D esiphakanyisiwe siyi:
- Intsha kunama-50: 5 ama-micrograms / 200IU
- 50-70 ubudala: 10 micrograms / 400IU
- Iminyaka engaphezu kwengu-70 ubudala: ama-micrograms angu-15 / 600IU
Yiziphi Imithombo Engcono Yokudliwa Kwe-Vitamin D?
I-Vitamin D itholakala ekudleni okuningi, futhi imikhiqizo eminingi ejwayelekile yokudla "iyaphumelelwa" nge-vitamin D. Ubisi, uketshezi nokupaka ufulawa yiwona wonke imikhiqizo equkethe "i-vitamin D." enezinye izinto ezinhle.
- I-Salmon 4oz: 400IU
- Ubisi 1cup: 50-75IU
- I-3oz ye-3: 200IU
- Amaqanda: 20UU ngamunye
- Amakhowe 3oz (inkomishi yesiqingatha): 2700IU (i-organic, i-UV ephathwayo)
Lokhu kudla konke kuyingxenye yokudla okunempilo nokulinganisela.
Imithombo
Lind, L, Wengle, B, Wide, L, et al. Ukunciphisa Ukucindezelwa Kwegazi Ngesikhathi Sokulashwa Kwesikhathi Eside Nge-vitamin D esebenzayo (i-Alphacalcidol) Ingabe ixhomeke emsebenzini we-Plasma Renin Isimo nesimo se-calcium. Isifundo esilawulwa ngokuPhepha, esiphansi kwe-Placebo. Am J Hypertens 1989; 2:20.
Pfeifer, M, Begerow, B, Minne, HW, et al. Imiphumela ye-Vitamin D 3 Yesikhathi esifushane ne-Calcium Supplementation nge-Blood Pressure kanye namazinga e-Hormone e-Parathyroid kumama asebekhulile. J Clin Endocrinol Metab 2001; 86: 1633.
UThomas J. Wang, et al. I-Vitamin D Ukuntuleka Neengozi Yezifo Zezinhliziyo. Ukujikeleza uJan 2008; i-doi: 10.1161 / i-CIRCULATIONAHA.107.706127