【保健知多D】維生素知多D:維生素E
〈維生素E關維生素C咩事?〉
說到維生素E,坊間總是大多離不開「抗氧化」。
實際上,維生素E到底又有什麼功效呢?
首先維生素E的確是一種抗氧化劑(Antioxidant),主要用來KO體內的自由基(Free Radicals)。
一般相信自由基可能會加速人體老化,甚至致癌,所以理論上,維生素E或許能夠減慢老化、預防癌症。
實際上,維生素E往往又可能會搭配維生素C同服。
為什麼?
其實說到抗氧化劑,大家還可能會聽過維生素C吧?
對,維生素C同是一種抗氧化劑。
因為維生素E是一種脂溶性維生素,而維生素C則是一種水溶性維生素,所以彼此便能夠互補對方的不足,一個水裡水裡來,一個火裡火裡去……不,不,不,應該是油裡油裡去,從而達到全方位的抗氧化效果。
實際上,一些研究指出這種組合多少能夠預防曬傷。[1][2][3][4][5]
除此之外,維生素E還可能會預防前列腺癌。[6]
不過維生素E其實都有很多種形態,例如Alpha-tocopherol(α-tocopherol)、Beta-tocopherol(β-tocopherol)、Gamma-tocopherol(γ-tocopherol)、Delta-tocopherol(δ-tocopherol)。
其中一些研究顯示Gamma-tocopherol可能較適合用來預防前列腺癌。[7][8]
至於Alpha-tocopherol還可以分為天然、人工兩種,一般分別稱為d-alpha-tocopherol、dl-alpha-tocopherol。
相較而言,因為部分dl-alpha-tocopherol不含活性,所以攝取量一般較大。
在副作用上,因為維生素E可能會抗凝血,所以較可能會加強一些抗凝血藥、抗血小板藥的功效,例如華法林(Warfarin)、肝素(Heparin)、亞士匹靈(Aspirin)、Clopidogrel,從而可能會增加出血的風險。
當然,除此之外,其他中藥例如當歸、丹參同樣可能會跟維生素E產生這種相互作用,從而可能會增加出血的風險。
所以如果正在服用這些中、西藥的話,一般建議服用維生素E前首先應該諮詢醫生的專業意見。
實際上,一項研究指出每天服用大約50 IU的人工維生素E便可能會增加出現出血性中風(Hemorrhagic Stroke)的風險[9],不過詭異的是這卻可能會減少出現缺血性中風(Ischemic Stroke)的風險。[10]
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Reference:
1. Fuchs J, Kern H. Modulation of UV-light-induced skin inflammation by d-alpha-tocopherol and l-ascorbic acid: a clinical study using solar simulated radiation. Free Radic Biol Med. 1998;25:1006-1012.
2. Eberlein-Konig B, Placzek M, and Przybilla B. Protective effect against sunburn of combined systemic ascorbic acid (vitamin C) and d-alpha-tocopherol (vitamin E). J Am Acad Dermatol. 1998;38:45-48.
3. Darr D, Dunston S, Faust H, et al. Effectiveness of antioxidants (vitamin C and E) with and without sunscreens as topical photoprotectants. Acta Derm Venereol. 1996;76:264-268.
4. Trevithick JR, Shum DT, Redae S, et al. Reduction of sunburn damage to skin by topical application of vitamin E acetate following exposure to ultraviolet B radiation: effect of delaying application or of reducing concentration of vitamin E acetate applied. Scanning Microsc. 1993;7:1269-1281.
5. Trevithick JR, Xiong H, Lee S, et al. Topical tocopherol acetate reduces post-UVB, sunburn-associated erythema, edema, and skin sensitivity in hairless mice. Arch Biochem Biophys. 1992;296:575-582.
6. Heinonen OP, Albanes D, Virtamo J, et al. Prostate cancer and supplementation with alpha-tocopherol and beta-carotene: incidence and mortality in a controlled trial. J Natl Cancer Inst. 1998;90:440-446.
7. Helzlsouer KJ, Huang HY, Alberg AJ, et al. Association between alpha-tocopherol, gamma-tocopherol, selenium, and subsequent prostate cancer. J Natl Cancer Inst. 2000;92:2018-2023.
8. Wright ME, Weinstein SJ, Lawson KA, et al. Supplemental and dietary vitamin E intakes and risk of prostate cancer in a large prospective study. Cancer Epidemiol Biomarkers Prev. 2007;16:1128-1135.
9. Leppala JM, Virtamo J, Fogelholm R, et al. Controlled trial of alpha-tocopherol and beta-carotene supplements on stroke incidence and mortality in male smokers. Arterioscler Thromb Vasc Biol. 2000;20:230-235.
10. Leppala JM, Virtamo J, Fogelholm R, et al. Vitamin E and beta carotene supplementation in high risk for stroke. A subgroup analysis of the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study. Arch Neurol. 2000;57:1503-1509.
delta male 在 傅志遠 Peter Fu Facebook 的最佳貼文
這篇學到一個重要的單字:
blatant discrimination 明目張膽毫不掩飾的歧視
我佩服他在飛機上挺身而出的勇氣,也同情他因為種族膚色而遭到的歧視
如果在飛機上聽到類似的廣播,我其實不確定自己會不會站起來,也不確定自己會不會也被當做沒牌的醫生...
(呼應前陣子履次被鄰居誤認為學生的梗~~)
I'm sure many of my fellow young, corporate America working women of color can all understand my frustration when I say I'm sick of being disrespected.
Was on Delta flight DL945 and someone 2 rows in front of me was screaming for help. Her husband was unresponsive. I naturally jumped into Doctor mode as no one else was getting up. Unbuckle my seatbelt and throw my tray table up and as I'm about to stand up, flight attendant says "everyone stay calm, it's just a night terror, he is alright". I continue to watch the scene closely.
A couple mins later he is unresponsive again and the flight attendant yells "call overhead for a physician on board". I raised my hand to grab her attention. She said to me "oh no sweetie put ur hand down, we are looking for actual physicians or nurses or some type of medical personnel, we don't have time to talk to you" I tried to inform her that I was a physician but I was continually cut off by condescending remarks.
Then overhead they paged "any physician on board please press your button". I stare at her as I go to press my button. She said "oh wow you're an actual physician?" I reply yes. She said "let me see your credentials. What type of Doctor are you? Where do you work? Why were you in Detroit?" (Please remember this man is still in need of help and she is blocking my row from even standing up while
Bombarding me with questions).
I respond "OBGYN, work in Houston, in Detroit for a wedding, but believe it or not they DO HAVE doctors in Detroit. Now excuse me so I can help the man in need". Another "seasoned" white male approaches the row and says he is a physician as well. She says to me "thanks for your help but he can help us, and he has his credentials". (Mind you he hasn't shown anything to her. Just showed up and fit the "description of a doctor") I stay seated. Mind blown. Blood boiling. (Man is responding the his questions and is seemingly better now Thank God)
Then this heifer has the nerve to ask for my input on what to do next about 10 mins later. I tell her we need vitals and blood sugar. She comes back to report to me a BP of 80/50 (super low, to my non medical peeps) and they can't find a glucometer. We continue down that pathway of medical work up, but the point is she needed my help and I continued to help despite the choice words I had saved up for her. The patient and his wife weren't the problem, they needed help and we were mid flight.
She came and apologized to me several times and offering me skymiles. I kindly refused. This is going higher than her. I don't want skymiles in exchange for blatant discrimination. Whether this was race, age, gender discrimination, it's not right. She will not get away with this....and I will still get my skymiles....