膳食指南要改写?心血管疾病,动物、植物、总脂肪都不背锅!

2021-11-08 LILYMED MedSci原创

Nutr Metab:膳食脂肪和心血管发病风险之间的关联:德黑兰脂质和葡萄糖研究。

传统的饮食指南通常建议低脂肪饮食(能量不足30%)和限制饱和脂肪酸(SFA)摄入量(能量不足10%),以防止心血管疾病(CVD)。低脂饮食建议都基于一个假设——膳食脂肪酸和血清低密度脂蛋白(LDL-C)之间的线性关联,以及LDL-C浓度与动脉粥样硬化和心血管事件发展之间的关联。

尽管指南限制总脂肪和SFA摄入量,许多前瞻性的队列研究结果并不支持膳食脂肪和CVD之间的任何显著关联。在18个国家的一项大型前瞻性队列研究报告中,总脂肪和SFA摄入量与CVD无显著关系。最近的一项包括43个队列的荟萃分析也显示,总脂肪,SFA,单不饱和(MUFA)和多不饱和(PUFA)脂肪酸与CVD事件的风险之间并无显著关联。

此外,很少有研究调查特定饱和脂肪酸(如月桂酸,肌酸,棕榈酸和乳酸)在饮食和CVD发病率之间的关联。关于替代宏量营养素的前瞻性研究表明,结果通常相互矛盾,其中一些研究报告了当SFA被PUFA取代时对CVD风险的有益影响,而用碳水化合物取代SFA对心代谢风险因素有明显的不利影响。

本研究旨在评估膳食总量、饱和脂肪和不饱和脂肪、特定以及动物和植物脂肪来源脂肪酸之间的潜在关联,并存在 CVD 事件的风险。此外,还调查了脂肪和CVD之间的关联,考虑到与其他宏量营养素的替代。

本研究使用了从德黑兰脂质和葡萄糖研究(TLGS)收集的数据。最终研究人口为2809名成人(图1),随访的中位数期为基线检查起10.6年。

参与者的平均年龄(±SD)为39.56±14.02岁,43.9%的参与者为男性。随访持续时间中位数为10.6年(9.90-11.1),同期CVD事件的发生率为7.1%。平均 (± SD) 饮食摄入总量, 总 SFA, 月桂酸, 肌酸, 棕榈酸, 乳酸, MUFA、PUFA、欧米茄-3和欧米茄-6分别为31.32(±7.07)、10.54(±4.70)、0.35(±0.23)、0.87(±0.39)、4.90(±1 36)、2.00(±0.54)、10.87(±2.88)、6.55(±2.35)、0.52(±0.25)、5.66(±2.22)。

参与者的基线特征见表1。与没有CVD事件的参与者相比,CVD的参与者往往年龄较大,更有可能是男性和当前吸烟者,BMI、腰围、TG/HDL比率、TG/HDL比率、TG血清浓度、总胆固醇、HDL-C、LDL-C和HTN发病率较高(所有P<0.05)。

此外,有CVD结果的参与者,每天摄入的总脂肪,总SFA,月桂酸,肌酸,乳酸,总MUFA,动物脂肪和总胆固醇的摄入量显著降低,每天摄入的茶和咖啡在基线上显著增加(所有P<0.05)。两组食物摄入量在总能量、棕榈酸、总 PUFA、欧米茄-3、欧米茄-6、欧米茄-6/欧米茄-3 比和植物脂肪方面没有显著差异。

膳食脂肪摄入类别的 CVD 事件的 HR (95% CI) 如表2。经过校正混淆变量后,总脂肪、动物和植物脂肪来源与CVD风险之间没有显著的关联(HR 0.80, 95% CI 0.46-1.37;总脂肪趋势P =0.396, HR 0.80, 95% CI= 0.49-1.28;动物来源脂肪趋势P =0.459, HR 0.87, 95% CI 0.56-1.35;植物来源的脂肪趋势P=0.583)。

 

在粗模型中,较高的总SFA摄入量以及月桂酸、肉豆素酸和硬脂酸的摄入量与较低的CVD事件风险相关(P均<0.05)。然而,在完全调整模型中,总SFA或单饱和脂肪酸与CVD风险之间没有显著关联(HR 0.75, 95% CI 0.45-1.23;总SFA的趋势P =0.263, HR 0.79, 95% CI 0.52-1.18;月桂酸趋势P =0.377, HR 0.94, 95% CI0.63-1.40;肉豆蔻酸趋势P =0.874, HR 1.05, 95% CI 0.71-1.54;棕榈酸趋势P =0.800,HR 0.70, 95% CI= 0.42-1.16;硬脂酸趋势P=0.150)。

表4显示了饮食中不饱和脂肪类别中CVD发生率(95% CI)。尽管在原始模型中,较高的MUFA摄入量与较低的CVD事件风险相关(HR 0.64, 95% CI 0.45-0.90;P =0.009),在调整潜在混杂因素后,总MUFA或PUFA以及omega-3、omega-6脂肪及其比例与CVD风险之间没有显著关联(HR 0.90, 95% CI 0.53-1.55;总MUFA趋势P =0.667, HR 1.08, 95% CI 0.67-1.73;总PUFA趋势P =0.680, HR 1.52, 95% CI 0.98-2.33;omega3趋势P =0.057 , HR 1.02, 95% CI 0.64-1.63;omega6趋势P =0.893, HR 0.91, 95% CI 0.64-1.31;欧米茄6/欧米茄3比率趋势P =0.626)。

此外,根据连续脂肪摄入量调整的心血管疾病危险度(95% CI)为总脂肪0.96(0.88-1.05)(每10 g/d)、总SFA 0.93(0.83-1.05)(每5 g/d)、MUFA 0.91(0.81-1.02)(每5 g/d)、PUFA 0.94(0.82-1.07)(每5 g/d)。

此外,我们使用限制性三次样条曲线来评估膳食脂肪和心血管事件风险的剂量-反应关系。总脂肪、动物和植物脂肪、SFA、MUFA、PUFA的膳食摄入量与心血管疾病风险之间没有显著的非线性关联(附加数据1:图1)。

替代分析,即总脂肪供能中5%替代碳水化合物或蛋白质供能中的5%,用SFA供能的1%替换来自碳水化合物、蛋白质、PUFA、MUFA、欧米茄-3和欧米茄-6供能的1%,同时保持总能量摄入量不变,估算CVD事件的风险在图2中显示。在完全调整的模型中,用总脂肪或SFA替代其他宏量营养素或其他脂肪与心血管疾病的风险无关。

综上,在这项前瞻性队列研究中,未发现总脂肪、动物或植物脂肪来源与CVD事件风险有显著关联此外,总SFA, MUFA,多不饱和脂肪酸,omega-3和omega-6摄入量与心血管疾病风险无关不同碳链长度的SAS与CVD风险无相关性。总脂肪或SFA与其他宏量营养素的同热量替代与CVD风险无关。

总的来说,本研究序列未观察到不同类型的膳食脂肪与心血管疾病发病率之间的任何显著关联。未来需要进一步的前瞻性和临床试验研究厘清膳食常量营养素与心血管疾病风险之间的关联,并重新考虑预防心血管疾病事件的膳食指南

 

原文来源:

Gaeini et al. The association between dietary fats and the incidence risk of cardiovascular outcomes: Tehran Lipid and Glucose Study. Nutr Metab (Lond) (2021) 18:96
https://doi.org/10.1186/s12986-021-00624-6

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    2021-12-31 xuyong535
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    2021-11-09 ms9000001258055198

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    2021-11-09 zhaojie88
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