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大豆異黃酮的保健功效

作者:yuxin_9605  於 2011-1-24 01:16 發表於 最熱鬧的華人社交網路--貝殼村

通用分類:健康生活|已有1評論

 大多數人認為,黃豆的異黃酮是強力的抗氧化物,能夠降低自由基對於低密度脂蛋白的氧化,降低低密度脂蛋白膽固醇在動脈中沉積而演變為動脈硬化的情況。據自治區食品藥品監督管理局工作人員介紹,大豆異黃酮還有很多保健功能。

  在每100克大豆樣品中,含異黃酮128毫克,傳統方法生產的分離蛋白含異黃酮102毫克,而豆乳中含9.65毫克,因為豆乳含水93.27%,相當於干物質中每100克也含異黃酮100毫克以上。豆腐中含異黃酮27.74毫克,其干物質含異黃酮200毫克以上。

  異黃酮是一種弱的植物雌激素,大豆是人類獲得異黃酮的惟一有效來源。在雌激素生理活性強的情況下,異黃酮能起抗雌激素作用,降低受雌激素激活的癌症如乳腺癌的風險,而當婦女絕經時期雌激素水平降低,異黃酮能起到替代作用,避免潮熱等停經期癥狀發生。另外,異黃酮的抗癌特性十分突出,能阻礙癌細胞的生長和擴散,而且只對癌細胞有作用,對正常細胞並無影響。

  異黃酮還是一種有效的抗氧化劑,能阻止氧自由基的生成,而氧自由基是一種強致癌因素。可見異黃酮的抗癌作用有多種方式和途徑。ZT


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回復 在美一方 2011-1-24 03:58
全面了解一下比較好,最好不要片面只介紹好的作用,忽視可能的不好的作用,根據wiki
There are conflicting studies, and it is unclear if phytoestrogens have any effect on the cause or prevention of cancer in females.[25][26] Epidemiological studies showed a protective effect against breast cancer.[27] In vitro studies concluded that females with current or past breast cancer should be aware of the risks of potential tumor growth when taking soy products, as they can stimulate the growth of estrogen receptor-positive cells in vitro. The potential for tumor growth was found related only with small concentration of genistein, and protective effects were found with larger concentrations of the same phytoestrogen.[28] A 2006 review article stated the opinion that not enough information is available, and that even if isoflavones have mechanisms to inhibit tumor growth, in vitro results justify the need to evaluate, at cellular level, the impact of isoflavones on breast tissue in females at high risk for breast cancer.[29] Recent epidemiologic studies suggest that consumption of soy estrogens is safe for patients with breast cancer, and may decrease mortality and recurrence rates.[30] A Cochrane Review of the use of phytoestrogens to relieve the vasomotor symptoms of menopause (hot flashes) demonstrated that there was no evidence to suggest any benefit to their use.[6]

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