Department of Food Science and Nutrition, Institute of Nutraceuticals and Functional Foods, Laval University, Québec, Canada G1V 0A6.
Br J Nutr. 2010 May;103(9):1331-9. doi: 10.1017/S0007114509993278. Epub 2009 Dec 23.
It is well known that diets high in nuts or peanuts favourably affect plasma lipid concentrations. However, few studies have examined the effects of nut and peanut protein (PP) on body composition and skeletal muscle properties. The present study was aimed at evaluating the effect of dietary PP compared with two animal proteins, casein (C) and cod protein (CP) on body composition, skeletal muscle contractile properties and lipid metabolism in rats. Thirty-two male rats were assigned to one of the following four diets containing either C, CP, PP or C+peanut protein (CPP, 50:50) mixture. After 28 d of ad libitum feeding and after 12-h fast, blood, liver and muscle were collected for measurements of plasma and hepatic cholesterol and TAG, plasma glucose and insulin and contractile properties. Rats fed with the low-quality protein, PP, had lower body weight gain, body protein mass, soleus mass and liver weight than those fed with the high-quality dietary proteins, C and CP. PP also caused a deficit in contractile properties in soleus. Likewise, PP increased plasma cholesterol and body fat mass compared with CP. However, these elevations were accompanied with increased hepatic TAG concentrations and lowered intestinal fat excretion. These results show that PP intake alters body composition by reducing skeletal muscle mass and liver weight as well as muscle contractility and lipid metabolism. Adding a complete protein such as C might partially counteract these adverse effects.
众所周知，高坚果或花生饮食有利于影响血浆脂质浓度。然而，很少有研究探讨坚果和花生蛋白（PP）对身体成分和骨骼肌特性的影响。本研究旨在评估与两种动物蛋白（酪蛋白（C）和鳕鱼蛋白（CP））相比，饮食中 PP 对大鼠身体成分、骨骼肌收缩特性和脂质代谢的影响。32 只雄性大鼠被分配到以下四种饮食中的一种：C、CP、PP 或 C+花生蛋白（CPP，50:50）混合物。在自由喂养 28 天后和禁食 12 小时后，收集血液、肝脏和肌肉，用于测量血浆和肝胆固醇和 TAG、血浆葡萄糖和胰岛素以及收缩特性。与高质量蛋白质 C 和 CP 相比，低质量蛋白质 PP 喂养的大鼠体重增加、身体蛋白质质量、比目鱼肌质量和肝脏重量较低。PP 还导致比目鱼肌收缩特性不足。同样，与 CP 相比，PP 增加了血浆胆固醇和体脂肪量。然而，这些升高伴随着肝 TAG 浓度的增加和肠道脂肪排泄的减少。这些结果表明，PP 的摄入通过减少骨骼肌质量和肝脏重量以及肌肉收缩性和脂质代谢来改变身体成分。添加完整的蛋白质（如 C）可能部分抵消这些不利影响。
