Harris Stephanie, DePalma Jessica, Barkoukis Hope
Department of Nutrition, School of Medicine-WG 48, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA.
Nutrients. 2025 Jul 28;17(15):2461. doi: 10.3390/nu17152461.
Dietary protein is an essential macronutrient derived from both plant and animal sources required for muscle building, immune function, and wound healing. However, in the United States, protein consumption worsens as individuals age, with 30% of men and 50% of women over 71 consuming inadequate dietary protein due to a variety of factors, including changes in gut function, loss of appetite, tooth loss, financial concerns, and social isolation. The aim of this review is to underscore the need for increased protein requirements in aging populations, highlight potential barriers, synthesize these protein requirements, and also recommend strategies to meet these increased protein needs. Achieving adequate protein status, especially when facing chronic or acute health concerns, is essential to promote muscle and bone strength (because aging is associated with significant decreases in postprandial muscle protein synthesis), to support immune health (due to immunosenescence), and to maintain a good quality of life. For older adults, the literature suggests that a dietary protein intake of at least 1.0-1.2 g/kg/day is required in healthy, aging populations, and intakes of 1.2-1.5 g/kg/day are necessary for those with chronic or acute conditions. These protein intake recommendations can increase to 2.0 g/kg/day in more severe cases of illness, malnutrition, and chronic conditions. The reviewed literature also suggests that evenly balanced protein distributions of 25-30 g of dietary protein (0.4 g/kg) per meal from animal and plant protein sources alike are sufficient to maximize muscle protein synthesis (MPS) rates in older populations. Additionally, pre-sleep protein feeds of 40 g/night may be another strategy to improve daily MPS and amino acid utilization.
膳食蛋白质是一种必需的宏量营养素,可从植物和动物来源获取,对肌肉构建、免疫功能和伤口愈合至关重要。然而,在美国,随着个体年龄增长,蛋白质摄入量会下降,71岁以上的男性中有30%、女性中有50%因多种因素(包括肠道功能变化、食欲不振、牙齿脱落、经济问题和社会隔离)而摄入的膳食蛋白质不足。本综述的目的是强调老年人群增加蛋白质需求量的必要性,突出潜在障碍,综合这些蛋白质需求,并推荐满足这些增加的蛋白质需求的策略。实现充足的蛋白质状态,尤其是在面临慢性或急性健康问题时,对于促进肌肉和骨骼强度(因为衰老与餐后肌肉蛋白质合成显著下降有关)、支持免疫健康(由于免疫衰老)以及维持良好的生活质量至关重要。对于老年人,文献表明,健康的老年人群膳食蛋白质摄入量至少需要1.0 - 1.2克/千克/天,而患有慢性或急性疾病的人群则需要1.2 - 1.5克/千克/天的摄入量。在病情更严重的疾病、营养不良和慢性病情况下,这些蛋白质摄入建议可增加到2.0克/千克/天。综述的文献还表明,每餐从动物和植物蛋白质来源均匀摄入25 - 30克膳食蛋白质(0.4克/千克)足以使老年人群的肌肉蛋白质合成(MPS)率最大化。此外,每晚40克的睡前蛋白质补充可能是提高每日MPS和氨基酸利用率的另一种策略。
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