Research progress on preventive and therapeutic effect of dietary polyphenols for type 2 diabetes mellitus
NIU Lubin1, HAN Shifan1,2,3*, ZHAO Yiwen4, ZHU Ruifang1
1.Nursing College of Shanxi Medical University, Shanxi 030001 China; 2.Shanxi Medical University Dietary Therapy Technology Research Center; 3.First Hospital of Shanxi Medical University; 4.Shanxi Medical Periodical Press Co., Ltd
*Corresponding Author" HAN Shifan, E?mail: shifan.han@sxmu.edu.cn
Abstract" To search the clinical trials of dietary polyphenols for the prevention and treatment of type 2 diabetes and its complications over the past 5 years,and explore the effect of dietary polyphenols for the prevention and treatment of type 2 diabetes and its complications based on the \"multi?targeted multi?component principle\".It's amied at providing a reference for the design of diabetes management diet formula and improvement of overall quality of life of patients with type 2 diabetes mellitus.
Keywords" " dietary polyphenols; type 2 diabetes mellitus; complication; preventive and therapeutic; dietary therapy; review
摘要" 通過(guò)檢索近5年膳食多酚防治2型糖尿病及其并發(fā)癥的臨床試驗(yàn)研究,基于針對(duì)多靶點(diǎn)的多種成分原則探討膳食多酚防治2型糖尿病及其并發(fā)癥的作用,以期為設(shè)計(jì)糖尿病管理飲食配方,改善2型糖尿病病人整體生活質(zhì)量提供參考。
關(guān)鍵詞" 膳食多酚;2型糖尿??;并發(fā)癥;防治;食療;綜述
doi:10.12102/j.issn.1009-6493.2024.22.013
2型糖尿?。╰ype 2 diabetes mellitus,T2DM)是一種以胰島素抵抗和β細(xì)胞功能障礙為特征的慢性代謝性疾病,占全球糖尿病病人的90%以上[1]。持續(xù)升高的血糖濃度使得大多數(shù)T2DM病人至少有1種并發(fā)癥,心血管并發(fā)癥是病人發(fā)病和死亡的主要原因之一[2]。T2DM發(fā)病逐漸呈年輕化趨勢(shì),早發(fā)型T2DM病人β細(xì)胞功能惡化速度比晚發(fā)型病人快[3],其并發(fā)癥發(fā)生風(fēng)險(xiǎn)也更高。然而,目前尚無(wú)根治T2DM及其并發(fā)癥的特效藥物[4],而臨床常采用的抗糖尿病藥物和胰島素注射等措施的潛在副作用和耐藥性相關(guān)問(wèn)題尚未解決[5],有必要尋求替代治療方法。近年來(lái),許多來(lái)自天然植物的非營(yíng)養(yǎng)物質(zhì)因具有良好的療效和較小的副作用引起了研究者關(guān)注[6]。非營(yíng)養(yǎng)素是不屬于營(yíng)養(yǎng)素類(lèi)別的物質(zhì),但在調(diào)節(jié)身體功能和預(yù)防疾病方面發(fā)揮著重要作用,其中的多酚是飲食中的主要非營(yíng)養(yǎng)素[7?8]。流行病學(xué)證據(jù)表明,多酚可以降低T2DM患病風(fēng)險(xiǎn),有利于T2DM的管理[9?10]。實(shí)驗(yàn)結(jié)果表明,多酚具有多種治療功能活性,可以通過(guò)多種不同的途徑表現(xiàn)出抗糖尿病特性,在調(diào)節(jié)胰島素抵抗和葡萄糖穩(wěn)態(tài)方面發(fā)揮著至關(guān)重要的作用[11]。廣泛的糖尿病嚙齒動(dòng)物模型研究表明,膳食多酚在T2DM及其并發(fā)癥發(fā)生和進(jìn)展方面扮演著重要角色[12]。目前,已有部分研究者對(duì)膳食多酚在人體中的安全性及有效性進(jìn)行了驗(yàn)證[13]?!吨袊?guó)糖尿病醫(yī)學(xué)營(yíng)養(yǎng)治療指南(2022版)》[14]指出,植物化學(xué)物多酚可能通過(guò)其較強(qiáng)的抗炎、抗氧化等作用對(duì)T2DM及其并發(fā)癥起到一定的防治作用。越來(lái)越多的證據(jù)表明,多酚在T2DM及其并發(fā)癥的治療中具有相應(yīng)效果[15]。鑒于此,有必要總結(jié)最新的臨床研究闡明其具體作用?,F(xiàn)重點(diǎn)總結(jié)近5年膳食多酚管理和治療T2DM及其并發(fā)癥的臨床試驗(yàn)進(jìn)展,并提出可能的干預(yù)策略,以實(shí)現(xiàn)最佳的血糖控制,提高T2DM治療效果。
1" 膳食多酚的概述
1.1 多酚的定義
多酚最早可追溯至遠(yuǎn)古時(shí)代,當(dāng)時(shí)人類(lèi)已經(jīng)有意識(shí)地將植物多酚用于鞣制皮革,直至1981年,Haslam將其定義為“植物多酚”[16]。多酚是指含有芳香環(huán)和至少2個(gè)羥基的化學(xué)物質(zhì),是植物生長(zhǎng)發(fā)育過(guò)程中產(chǎn)生并廣泛存在于植物體內(nèi)的次級(jí)代謝產(chǎn)物,有利于植物防御非生物脅迫條件(如紫外線輻射和降水)、食草動(dòng)物的攻擊及植物病原體的侵襲[17]。
1.2 膳食多酚的分類(lèi)
植物性食物中有數(shù)百種多酚類(lèi)化合物[18],其結(jié)構(gòu)多樣,分布廣泛,分類(lèi)方法多樣[19]。1)依據(jù)食物來(lái)源,膳食多酚可分為蔬果多酚、谷物多酚、豆類(lèi)多酚和其他酚類(lèi)等。蔬果多酚中目前研究較多的有蓮藕多酚、柑橘多酚及葡萄多酚等;谷物多酚尤其是彩色谷物如大米、大麥、燕麥和高粱中發(fā)現(xiàn)的多酚類(lèi)化合物研究較為廣泛[20];豆類(lèi)多酚中如豌豆、蕓豆、赤小豆生物學(xué)潛力較大,如何更好地促進(jìn)開(kāi)發(fā)和利用是研究熱點(diǎn)[21?23];其他酚類(lèi)如茶、咖啡、可可、生姜等[24?27]對(duì)慢性病作用的分子機(jī)制和生物學(xué)標(biāo)志物研究也被逐步探索。2)根據(jù)化學(xué)結(jié)構(gòu),國(guó)內(nèi)外天然多酚有不同的分類(lèi),但大體相似。同時(shí),膳食多酚類(lèi)化合物也可分為酚類(lèi)單體和聚合多酚,酚類(lèi)單體包括黃酮類(lèi)和非黃酮類(lèi)化合物,而聚合多酚是由單體聚合的低聚或多聚物,統(tǒng)稱為單寧[28]。酚類(lèi)單體中黃酮類(lèi)化合物包括黃酮醇、黃酮、黃烷醇、黃烷酮、異黃酮和花青素,黃酮醇是最常見(jiàn)的黃酮類(lèi)化合物[7]。非黃酮類(lèi)化合物包括酚酸、二苯乙烯和木脂素類(lèi)[29?30],酚酸又分為羥基苯甲酸和羥基肉桂酸2種類(lèi)型[31],羥基肉桂酸比羥基苯甲酸更常見(jiàn)。二苯乙烯類(lèi)化合物中白藜蘆醇是研究最多的天然化合物,紅葡萄和葡萄酒是最常見(jiàn)的白藜蘆醇來(lái)源[32],詳見(jiàn)表1。
1.3 膳食多酚的代謝和生理作用
多酚是植物在生長(zhǎng)過(guò)程中及應(yīng)對(duì)環(huán)境脅迫效應(yīng)產(chǎn)生,日光、土壤類(lèi)型、降水等條件均會(huì)對(duì)食物多酚含量產(chǎn)生影響[33]。當(dāng)食用植物性食物時(shí),部分酚類(lèi)生物活性物質(zhì)可能溶解在胃和小腸中,部分酚類(lèi)生物活性物質(zhì)通過(guò)小腸黏膜吸收,其余在大腸中由腸道菌群轉(zhuǎn)化為其他酚類(lèi)衍生物吸收,從而產(chǎn)生代謝和全身效應(yīng)[34]。據(jù)估計(jì),90%~95%的膳食酚類(lèi)物質(zhì)不是在小腸中吸收,而是積聚在大腸腔中,腸道微生物群將其轉(zhuǎn)化為活性代謝物,從而產(chǎn)生健康保護(hù)的功能[35]。此外,食物中多種膳食因子也會(huì)影響多酚在體內(nèi)的吸收、分布、代謝和排泄[36]。如上所述,膳食多酚的生物功效取決于原始食物基質(zhì)、特定的食品加工及消化吸收過(guò)程[37]。多酚類(lèi)物質(zhì)進(jìn)入細(xì)胞會(huì)引發(fā)全身性和組織特異性效應(yīng),產(chǎn)生多個(gè)治療靶點(diǎn)的作用。目前研究較多的多酚生物活性包括5類(lèi)。1)強(qiáng)大的抗氧化活性:通過(guò)清除自由基、調(diào)節(jié)核因子E2相關(guān)因子2(Nrf2)/抗氧化反應(yīng)元件(ARE)信號(hào)通路及調(diào)節(jié)超氧化物歧化酶(SOD)、谷胱甘肽?S轉(zhuǎn)移酶(GST)等酶實(shí)現(xiàn);2)抗炎作用:通過(guò)各種機(jī)制,如調(diào)節(jié)核因子κB(NF?κB)、絲裂原活化蛋白激酶(MAPK)和磷脂酰肌醇3激酶/蛋白激酶B(PI3K/Akt)細(xì)胞信號(hào)通路或抑制炎癥反應(yīng)的關(guān)鍵調(diào)節(jié)因子腫瘤壞死因子?α(TNF?α)、白細(xì)胞介素?6(IL?6)以及滅活促炎酶脂氧合酶(LOX)和環(huán)氧合酶(COX)等實(shí)現(xiàn);3)抗增殖作用:通過(guò)改變氧化還原狀態(tài)影響基本細(xì)胞功能,即細(xì)胞周期、細(xì)胞凋亡、血管生成、炎癥、侵襲和轉(zhuǎn)移;4)表觀遺傳調(diào)節(jié);5)抗菌及抗病毒等[30,38?40]。膳食多酚通過(guò)抗氧化、抗炎癥、調(diào)節(jié)代謝發(fā)揮對(duì)T2DM的預(yù)防控制作用,與韓世范教授提出的非營(yíng)養(yǎng)素防治慢性病的食療理論模型——家庭護(hù)士食療理論[41]一致。
2" 膳食多酚對(duì)T2DM的緩解作用
異常的蛋白質(zhì)加工、氧化應(yīng)激和促炎細(xì)胞因子引發(fā)炎癥級(jí)聯(lián)反應(yīng)共同導(dǎo)致了外周低度慢性炎癥和胰島素抵抗(IR),引發(fā)T2DM[42]。膳食多酚可以通過(guò)靶向多種途徑調(diào)節(jié)代謝,Shahwan等[43]綜述了膳食多酚對(duì)抗T2DM及IR的作用機(jī)制。Rienks等[44]分析了18項(xiàng)關(guān)于多酚與T2DM間關(guān)聯(lián)的前瞻性流行病學(xué)研究,進(jìn)一步證明富含多酚(尤其是黃酮類(lèi)化合物)的飲食在預(yù)防T2DM方面發(fā)揮著巨大作用。Kosmalski等[45]評(píng)估了129例T2DM病人膳食多酚攝入與選定代謝及炎癥標(biāo)志物間的關(guān)系,采用食物頻率問(wèn)卷估計(jì)食物中多酚含量,利用中值劃分多酚攝入的高低,低多酚含量攝入平均為958 mg/d時(shí),類(lèi)黃酮含量為406 mg/d;高多酚含量攝入平均為2 076 mg/d時(shí),類(lèi)黃酮含量為1 101 mg/d,結(jié)果表明,多酚類(lèi)物質(zhì)的攝入可能會(huì)調(diào)節(jié)空腹血糖(FBS)水平,并對(duì)糖化血紅蛋白(HbA1c)產(chǎn)生影響;與類(lèi)黃酮攝入較低的組別相比,高類(lèi)黃酮攝入組病人FBS水平顯著降低,且FBS與總多酚、類(lèi)黃酮、黃烷?3?醇和二苯乙烯的攝入量呈負(fù)相關(guān)。食物多酚的攝取情況主要受攝入食物的種類(lèi)、頻率和數(shù)量影響,近年來(lái)使用多酚在T2DM病人中進(jìn)行干預(yù)的隨機(jī)對(duì)照試驗(yàn)相關(guān)信息見(jiàn)表2。
來(lái)自蜂膠、石榴、樹(shù)莓(覆盆子)、蒔蘿(土茴香)、小麥胚芽、藍(lán)莓、椰棗、越橘、特級(jí)初榨橄欖油的多酚及姜黃素、白藜蘆醇、染料木黃酮、鞣花酸可以通過(guò)減輕氧化損傷、減少炎癥因子的產(chǎn)生、提高脂聯(lián)素水平、增加葡萄糖向組織的轉(zhuǎn)移、抑制糖類(lèi)消化酶活性、降低胰島素抵抗發(fā)揮抗T2DM的作用。盡管已有干預(yù)研究持續(xù)時(shí)間不等,樣本量不一,但均評(píng)估了氧化應(yīng)激、炎癥、胰島素敏感性相關(guān)結(jié)局指標(biāo),并證實(shí)了多酚在T2DM臨床試驗(yàn)中的多種生理活性且未表現(xiàn)出明顯的副作用。
從種類(lèi)來(lái)看,水果是近年來(lái)干預(yù)研究中應(yīng)用于T2DM病人較多的膳食多酚來(lái)源,水果中的漿果因含有高濃度的多酚而備受關(guān)注[60],如石榴、樹(shù)莓、藍(lán)莓等。石榴不同部位的成分顯示出治療包括T2DM在內(nèi)的多種疾病和病癥的潛力[58],在石榴皮和石榴果實(shí)的其他部位檢測(cè)到近48種酚類(lèi)成分[61]。石榴汁含大量的可溶性多酚,主要包括花青素和單寧。Sohrab等[47]研究表明,每日飲用200 mL石榴汁(含有2 125 mg/L總多酚和3 851 g/mL的總黃酮),持續(xù)6周,可降低T2DM病人血壓。Nemati等[62]評(píng)估了石榴汁攝入和有氧訓(xùn)練對(duì)中年男性T2DM病人胰島素抵抗、血清肝酶的單獨(dú)和聯(lián)合影響,結(jié)果顯示,連續(xù)8周、每日飲用240 mL石榴汁可以降低T2DM病人體重、體質(zhì)指數(shù)(BMI)、體脂、腰臀比、胰島素抵抗及ALT、AST、γ?谷氨酰氨基轉(zhuǎn)移酶,有益于T2DM病人血糖水平改善及并發(fā)癥預(yù)防。表明石榴汁有利于改善T2DM參數(shù),其占石榴果實(shí)總質(zhì)量的40%且常被認(rèn)為是廢物的石榴皮也是多酚的豐富來(lái)源[63]。已有研究表明,石榴皮提取物具有減輕T2DM病人炎癥、氧化應(yīng)激以及降低血糖、血脂、血壓的潛力,其在降低T2DM病人心血管并發(fā)癥風(fēng)險(xiǎn)方面發(fā)揮著潛在作用。石榴富含強(qiáng)大的生物活性成分,可能是飲食中抗氧化劑的重要來(lái)源[64]。與其他漿果相比,樹(shù)莓提取物在抑制α淀粉酶方面最有效,其不僅纖維素含量高,花青素和鞣花單寧含量也較高[60]。原花青素是α淀粉酶活性的重要抑制劑,是降低餐后血糖的假定機(jī)制之一。Schell等[48]以肥胖的T2DM成年病人為研究對(duì)象,每日在其飲食中添加樹(shù)莓,對(duì)其餐后和干預(yù)4周時(shí)的血糖、血脂和炎癥生物標(biāo)志物進(jìn)行檢驗(yàn),結(jié)果顯示,與不添加樹(shù)莓的病人相比,添加樹(shù)莓的T2DM病人餐后2 h和4 h的血糖水平降低,餐后4 h的IL?6和TNF?α血清生物標(biāo)志物水平較低,補(bǔ)充250 g紅樹(shù)莓(343 mg多酚)4周后檢驗(yàn)結(jié)果顯示,病人IL?6和TNF?α水平仍受到影響且收縮壓呈下降趨勢(shì),但病人血糖、血脂和CRP受影響不明顯??梢?jiàn),樹(shù)莓可以降低餐后高血糖和炎癥,并對(duì)T2DM成年病人具有特定的抗炎作用[65]。
已有研究中多種食物來(lái)源的白藜蘆醇對(duì)T2DM血糖和脂質(zhì)代謝的影響研究結(jié)果不一。Gu等[66]對(duì)2021年8月以前白藜蘆醇對(duì)T2DM病人代謝指標(biāo)影響的隨機(jī)對(duì)照試驗(yàn)進(jìn)行系統(tǒng)評(píng)價(jià),涉及1 151例T2DM病人,結(jié)果表明白藜蘆醇可以降低SBP、DBP,大劑量白藜蘆醇(≥1 000 mg)可以降低T2DM病人的空腹血糖。鑒于不同劑量的白藜蘆醇具有不同效應(yīng),García?Martínez等[67]對(duì)2022年1月以前的17項(xiàng)臨床試驗(yàn)進(jìn)行系統(tǒng)評(píng)價(jià),結(jié)果顯示,lt;250 mg/d、250~500 mg/d和gt;500~1 000 mg/d的白藜蘆醇均可降低45~59歲病人的血糖水平,而僅有250~500 mg/d的白藜蘆醇可以降低60歲以上病人的血糖水平。2023年,García?Martínez等[59]又對(duì)97例老年T2DM病人進(jìn)行隨機(jī)臨床試驗(yàn),觀察到高劑量(1 000 mg/d)白藜蘆醇的抗氧化作用高于中劑量(500 mg/d)白藜蘆醇,且高劑量白藜蘆醇的SIRT1水平增高。高劑量白藜蘆醇激活SIRT1的能力更強(qiáng),而SIRT1可刺激AMP依賴的蛋白激酶(AMPK),負(fù)向調(diào)節(jié)煙酰胺腺嘌呤二核苷酸磷酸(NADPH)氧化酶,并誘導(dǎo)SOD表達(dá)增加,從而減輕氧化損傷,改善胰島素抵抗并調(diào)節(jié)代謝穩(wěn)態(tài)。
3" 膳食多酚對(duì)T2DM慢性并發(fā)癥的緩解作用
T2DM病人長(zhǎng)期持續(xù)的慢性高血糖水平會(huì)導(dǎo)致其活性氧升高進(jìn)而激活信號(hào)通路,如晚期糖基化終產(chǎn)物(AGE)、蛋白激酶C(PKC)、多元醇和己糖胺通路,激活的信號(hào)通路觸發(fā)氧化應(yīng)激、炎癥和細(xì)胞凋亡導(dǎo)致慢性并發(fā)癥發(fā)生,如微血管并發(fā)癥和大血管并發(fā)癥[68]。微血管并發(fā)癥如T2DM病人的腎臟、神經(jīng)和視網(wǎng)膜中的小動(dòng)脈受損,可能導(dǎo)致腎臟、神經(jīng)病變和視網(wǎng)膜病變。大血管并發(fā)癥會(huì)導(dǎo)致大動(dòng)脈和心臟功能的損傷和破壞,器官受損。血糖控制不佳及糖尿病病程較長(zhǎng)等是發(fā)生T2DM慢性并發(fā)癥的重要危險(xiǎn)因素,嚴(yán)格控制以上危險(xiǎn)因素有利于延緩或預(yù)防T2DM相關(guān)并發(fā)癥的發(fā)生。目前,關(guān)于多酚對(duì)T2DM的直接預(yù)防作用研究較多,對(duì)T2DM并發(fā)癥的臨床保護(hù)作用研究有限[69]。多酚對(duì)T2DM的病理生理機(jī)制有顯著調(diào)節(jié)作用,提示其對(duì)慢性病并發(fā)癥的預(yù)防和治療具有潛力。目前針對(duì)糖尿病慢性并發(fā)癥治療的膳食多酚類(lèi)物質(zhì)主要有白藜蘆醇、姜黃素和綠茶多酚等。
糖尿病腎?。―KD)是糖尿病最嚴(yán)重和最常見(jiàn)的并發(fā)癥之一。微量白蛋白尿是進(jìn)行性糖尿病腎病的早期標(biāo)志物,任何預(yù)防或治療微量白蛋白尿的干預(yù)均可以延緩終末期腎病。一項(xiàng)雙盲、隨機(jī)、安慰劑對(duì)照臨床試驗(yàn)發(fā)現(xiàn),T2DM蛋白尿病人在服用氯沙坦的基礎(chǔ)上每日攝入500 mg的白藜蘆醇,3個(gè)月后尿白蛋白/肌酐比率降低,血清抗氧化酶活性顯著提高,在考慮人體測(cè)量學(xué)、血糖指標(biāo)等混雜變量后,白藜蘆醇在減少尿白蛋白排泄方面的作用仍然顯著[70],這可能與其抗氧化、抗炎活性有關(guān)。此外,補(bǔ)充姜黃素也有利于改善糖尿病腎病病人的腎功能、血脂、血壓和空腹血糖。Zhao等[71]就姜黃素對(duì)糖尿病腎病影響的隨機(jī)對(duì)照試驗(yàn)進(jìn)行系統(tǒng)評(píng)價(jià),結(jié)果顯示,補(bǔ)充姜黃素可改善血清肌酐、TC、SBP、FBS水平,可能對(duì)糖尿病腎病有巨大的潛在作用。
姜黃素的血糖管理作用不僅有利于糖尿病腎病病人的護(hù)理,還對(duì)T2DM病人糖尿病感覺(jué)運(yùn)動(dòng)性多發(fā)性神經(jīng)?。―SPN)具有積極影響。DSPN是糖尿病最常見(jiàn)的并發(fā)癥之一,可導(dǎo)致病人四肢活動(dòng)能力受損。一項(xiàng)臨床試驗(yàn)研究了補(bǔ)充納米姜黃素對(duì)T2DM病人DSPN嚴(yán)重程度的影響,納米姜黃素是將姜黃素封裝在納米顆粒中,其生物利用度相對(duì)更高,研究將80例病人隨機(jī)分配到80 mg納米姜黃素組或安慰劑組進(jìn)行干預(yù),8周后干預(yù)組FBS、HbA1c、神經(jīng)病變總分、總反射評(píng)分和體溫均降低,表明補(bǔ)充姜黃素減輕了T2DM病人DSPN的嚴(yán)重程度[72]。
膳食多酚類(lèi)化合物不僅在糖尿病微血管并發(fā)癥中發(fā)揮著至關(guān)重要的作用,也在早期大血管損害如內(nèi)皮功能障礙、動(dòng)脈粥樣硬化斑塊形成等中發(fā)揮輔助預(yù)防或緩解疾病的作用。晚期糖基化終末產(chǎn)物是人體內(nèi)還原糖與蛋白或脂質(zhì)發(fā)生的不可逆反應(yīng)所形成的非酶糖基化反應(yīng)最終產(chǎn)物[73],隨著晚期糖基化終末產(chǎn)物在血管內(nèi)皮的積聚和晚期糖基化終末產(chǎn)物受體(RAGE)的激活,氧化應(yīng)激和炎癥激活導(dǎo)致內(nèi)皮功能障礙,最終導(dǎo)致過(guò)早的動(dòng)脈粥樣硬化[68]。綠茶提取物具有抗晚期糖基化終末產(chǎn)物活性。Quezada?Fernández等[74]進(jìn)行了一項(xiàng)隨機(jī)、雙盲、安慰劑對(duì)照試驗(yàn),評(píng)估了綠茶提取物(總多酚≥90%)對(duì)T2DM病人動(dòng)脈硬化參數(shù)——中樞動(dòng)脈反射波增強(qiáng)指數(shù)(cAIx)、身體成分和可溶性RAGE水平的影響,干預(yù)12周后,綠茶提取物組cAIx降低,表明綠茶提取物在防治T2DM并發(fā)癥方面可輔助發(fā)揮積極作用。
4" 膳食多酚對(duì)T2DM及其并發(fā)癥的干預(yù)策略
4.1 關(guān)注膳食多酚,加強(qiáng)膳食管理
血糖控制不佳預(yù)示著更高的糖尿病相關(guān)并發(fā)癥和死亡風(fēng)險(xiǎn),更好地進(jìn)行代謝調(diào)節(jié)有利于糖尿病管理。膳食多酚干預(yù)具有安全性,有利于T2DM及其并發(fā)癥的治療。目前的食品和營(yíng)養(yǎng)模型主要是基于宏量營(yíng)養(yǎng)素含量和總能量估算設(shè)計(jì),忽略了植物性食物中其他營(yíng)養(yǎng)和生物活性成分的重要性,如保護(hù)健康的酚類(lèi)生物活性物質(zhì)。家庭護(hù)士食療理論是關(guān)于非營(yíng)養(yǎng)素的食療理論,關(guān)注到了非營(yíng)養(yǎng)素對(duì)慢性病的重要作用,該理論模型可為T(mén)2DM病人的非營(yíng)養(yǎng)素食療干預(yù)方案制定提供指導(dǎo),對(duì)疾病的控制、治療和預(yù)后有積極意義。
4.2 提高生物利用度,發(fā)揮膳食多酚的協(xié)同作用
目前被發(fā)現(xiàn)的多酚類(lèi)化合物已有8 000多種,在評(píng)估多酚對(duì)T2DM病人的干預(yù)效果時(shí),還需考慮干預(yù)措施是否基于全食物、純化提取物或分離化合物的攝入[75]。多酚類(lèi)化合物間可以相互發(fā)生作用,如木耳多酚的兩個(gè)重要組成成分綠原酸與槲皮素復(fù)合成分比單一成分抗炎效果更好,說(shuō)明二者之間存在著協(xié)同抗炎效應(yīng)[76];膳食多酚也可與人類(lèi)飲食中的脂質(zhì)、糖類(lèi)、蛋白質(zhì)等物質(zhì)組合表現(xiàn)出相加、協(xié)同或拮抗的抗氧化作用,如樹(shù)莓和小豆提取物結(jié)合可表現(xiàn)出多重協(xié)同作用[77]。與單個(gè)漿果相比,越橘、蔓越莓、接骨木果、樹(shù)莓和草莓的混合物表現(xiàn)出更高的抗氧化能力[78]。Pan等[79]評(píng)估了親水性植物化學(xué)物質(zhì)和親脂性植物化學(xué)物質(zhì)組合在不同摩爾比條件下的抗氧化相互作用,結(jié)果表明,親水性植物化學(xué)物質(zhì)比例較高的組別表現(xiàn)出協(xié)同作用,提示在設(shè)計(jì)功能性食品、日常膳食搭配時(shí)要重視酚類(lèi)等植物化學(xué)物的相互作用規(guī)律。為更好地研究多酚類(lèi)化學(xué)物質(zhì)間的協(xié)同降糖作用,應(yīng)建立一個(gè)綜合模型篩選協(xié)同物質(zhì)、進(jìn)行協(xié)同效應(yīng)量化和協(xié)同機(jī)制評(píng)價(jià)等[80],如可在家庭護(hù)士食療理論指導(dǎo)下研發(fā)抗炎、代謝調(diào)節(jié)等相互作用的評(píng)價(jià)方法,為T(mén)2DM膳食搭配提供理論依據(jù)和指導(dǎo)。此外,多酚類(lèi)化合物具有多個(gè)治療靶點(diǎn)和作用,持續(xù)存在于結(jié)腸中的多酚類(lèi)物質(zhì)可以改變腸道微生物群,影響其代謝產(chǎn)物的產(chǎn)生,靶向腸道、肝臟、胰腺等多種途徑發(fā)揮抗氧化、抗炎、調(diào)節(jié)代謝如胰島素抵抗等多種作用。通過(guò)協(xié)同研究模型和網(wǎng)絡(luò)藥理學(xué)、代謝組學(xué)方式等進(jìn)一步評(píng)估膳食多酚與其他食物的相互作用,確定其在體內(nèi)研究的多靶點(diǎn)作用機(jī)制及效果,改善或最大化膳食多酚與其他食品化合物的協(xié)同能力,有利于設(shè)計(jì)治療T2DM及其并發(fā)癥的膳食配方。
4.3 探索富含多酚的飲食模式或功能食品
關(guān)于多酚的臨床試驗(yàn)多為補(bǔ)充單種食物的效果評(píng)估,但飲食的綜合性影響也不容忽視。Condezo?Hoyos等[81]納入了5項(xiàng)研究進(jìn)行系統(tǒng)評(píng)價(jià),結(jié)果發(fā)現(xiàn),不同研究間飲食設(shè)計(jì)存在實(shí)質(zhì)性差異,所有研究的每日多酚攝入量中位數(shù)為2 564 mg,水果、蔬菜、飲料和可可制品是主要的膳食多酚來(lái)源;且不同研究向參與者提供的飲食指導(dǎo)存在較大差異,如要求參與者每日必須食用特定的食物組合或每日食用自己選擇的富含多酚的食物以及使用預(yù)先準(zhǔn)備好的膳食。不同研究中食用多酚的類(lèi)型和數(shù)量存在差異,研究者可根據(jù)T2DM具體特點(diǎn)提出特定的多酚攝入量、多酚種類(lèi),根據(jù)不同地區(qū)特色產(chǎn)品確定地域性的膳食多酚攝入建議。同時(shí),在現(xiàn)有生物技術(shù)工具幫助下,海洋多酚也在被不斷探索,其穩(wěn)定性好于陸地植物,使得飲食更加豐富、健康。此外,對(duì)地域性的單種食物或化合物進(jìn)行深入研究,通過(guò)納米封裝遞送系統(tǒng)等途徑提高其生物利用度,進(jìn)一步研究基于功能性食品組合的膳食,也可對(duì)T2DM及并發(fā)癥發(fā)揮保護(hù)作用。
5" 小結(jié)
膳食多酚對(duì)T2DM有特定的健康保護(hù)效應(yīng),但對(duì)其并發(fā)癥治療的潛力數(shù)據(jù)仍有限。膳食多酚對(duì)T2DM及其并發(fā)癥的影響程度、在不同臨床試驗(yàn)間的變異、每日飲食中最佳攝入量等問(wèn)題仍有待進(jìn)一步探索,未來(lái)應(yīng)進(jìn)行更多的干預(yù)研究探索膳食多酚及其相互作用對(duì)T2DM的效果,進(jìn)一步明確多酚在T2DM病人中的作用,為設(shè)計(jì)合理的、富含多酚的飲食方案提供參考。根據(jù)當(dāng)前飲食建議,T2DM病人可每日食用富含天然多酚的食物和飲料作為改善其血糖指標(biāo)和生活質(zhì)量的輔助策略。
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(收稿日期:2023-10-31;修回日期:2024-10-27)
(本文編輯 陳瓊)