内蒙古全草饲牛肉的营养优势与健康效应： 基于耐力与抗阻运动人群膳食需求的综述

Nutritional Advantages and Health Effects of Whole Grass Fed Beef in Inner Mongolia: A Review Based on the Dietary Needs of Endurance and Resistance Exercise Populations

摘要: 全民健身背景下，运动人群对高营养密度天然优质蛋白食材需求持续攀升。内蒙古终身100%全草饲牛肉(无谷物补饲、无激素添加、全程天然放牧)的运动营养价值尚未得到系统循证评估。本文系统综述其营养特征、生理健康效应及与耐力、抗阻运动人群的膳食适配性，采用GRADE系统开展证据等级评价。成分分析显示：全草饲牛肉粗蛋白含量20.5%~23.8%，可消化必需氨基酸评分(DIAAS) > 85；总脂肪仅2.5%~4.5%，ω-6/ω-3比值1.5:1~3:1；血红素铁2.5~3.2 mg/100 g，生物利用率15%~35%；共轭亚油酸(CLA)含量为谷饲牛肉的2~3倍，但日常膳食摄入量(0.3~0.5 g/d)远低于药理有效剂量。据推测(基于成分外推)，抗阻运动人群可依托(证据外推)优质蛋白为核心的肌肉修复与生长支持；横断面研究证据提示，耐力运动人群可通过高生物利用率血红素铁预防运动性贫血。与乳清蛋白、禽肉、深海鱼类、植物蛋白相比，全草饲牛肉营养全面性与功能协同性优势显著。当前结论多基于普通草饲牛肉成分分析与动物实验，直接针对内蒙古全草饲牛肉的人体RCT证据不足，外推存在局限性。未来需开展跨产区营养对比、剂量–效应关系研究及运动专用食品开发，为运动人群精准营养供给提供循证理论支撑。

Abstract: Under the background of national fitness, the demand for high nutrient density and high-quality natural protein ingredients among the sports population continues to rise. The exercise nutritional value of 100% whole grass fed beef in Inner Mongolia (without grain supplementation, hormone addition, and natural grazing throughout the entire process) has not been systematically and evidence-based evaluated. This article provides a systematic review of its nutritional characteristics, physiological health effects, and dietary compatibility with endurance and resistance exercise populations, using the GRADE system for evidence level evaluation. Ingredient analysis showed that the crude protein content of whole grass fed beef was 20.5%~23.8%, and the digestible essential amino acid score (DIAAS) was greater than 85; Total fat is only 2.5%~4.5%, with an omega-6/omega-3 ratio of 1.5:1~3:1; Heme iron 2.5~3.2 mg/100 g, bioavailability 15%~35%; The content of conjugated linoleic acid (CLA) is 2~3 times that of grain fed beef, but the daily dietary intake (0.3~0.5 g/d) is much lower than the pharmacological effective dose. It is estimated (by component extrapolation),Resistance exercise individuals can rely on (evidence extrapolation) high-quality protein based muscle repair and growth support; Cross-sectional study evidence suggests that people who engage in endurance exercise can prevent exercise-induced anemia through high bioavailability of heme iron. Compared with whey protein, poultry meat, deep-sea fish, and plant protein, whole grass fed beef has significant advantages in nutritional comprehensiveness and functional synergy. Current conclusions are mostly based on compositional analysis of conventional grass-fed beef and animal experiments. There is insufficient evidence from human RCTs specifically targeting fully grass-fed beef from Inner Mongolia, and extrapolation has limitations. In the future, cross regional nutrition comparison, dose-response relationship research, and development of sports specific foods need to be carried out to provide evidence-based theoretical support for precise nutrition supply for sports populations.