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相关概念视频

Overview of Protein Metabolism01:21

Overview of Protein Metabolism

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
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Proteins: Dietary Sources and Requirements01:28

Proteins: Dietary Sources and Requirements

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Consuming animal-based products offers high-quality proteins that contain optimal levels and combinations of essential amino acids, crucial for tissue repair and growth. Foods like eggs, milk, fish, and most meats are a source of complete proteins. Legumes and cereals are abundant in proteins; however, they typically lack a full range of essential amino acids. As a result, they are considered incomplete protein sources. Some plant sources like soybeans, quinoa, and amaranth do contain complete...
649
Protein Absorption01:12

Protein Absorption

329
Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
329
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Physiological Pharmacokinetic Models: Assumption with Protein Binding01:13

Physiological Pharmacokinetic Models: Assumption with Protein Binding

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Physiological models with protein binding in pharmacokinetics offer a sophisticated approach to understanding drug disposition. These models consider drug-protein interactions, enabling them to effectively predict drug concentrations in different organs and tissues. This precision aids in accurate drug dosing, providing a significant advantage over conventional models. A key process within these models is equilibration, which ensures that drug concentrations achieve a steady state within the...
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Metabolic States of the Body: Fasting and Starvation01:24

Metabolic States of the Body: Fasting and Starvation

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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
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蛋白质缺乏的神话 蛋白质缺乏的神话

Ricardo Abramovay1, Nadine Marques Nunes-Galbes2, Fernanda Helena Marrocos-Leite2

  • 1Universidade de São Paulo. Instituto de Estudos Avançados. São Paulo, SP, Brasil.

Revista de saude publica
|July 3, 2025
PubMed
概括

专注于蛋白质等单一营养素会忽略整体饮食模式. 即使是最贫穷的人群在满足能源需求时也不太可能经历蛋白质缺乏,这挑战了常见的假设.

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Isolation of Primary Mouse Hepatocytes for Nascent Protein Synthesis Analysis by Non-radioactive L-azidohomoalanine Labeling Method
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Quantitative Measurement of Intrathecally Synthesized Proteins in Mice
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科学领域:

  • 营养科学 营养科学
  • 公共卫生 公共卫生
  • 流行病学 流行病学

背景情况:

  • 高收入国家表现出过度的动物性食品消费,这与不利的健康结果有关.
  • 科学文献和国际组织的报告中经常指出贫困与蛋白质缺乏之间的关联.
  • 关注单个营养素,如蛋白质,而不是整个饮食模式,代表了营养科学中的概念陷.

研究的目的:

  • 挑战一种普遍的观念,即贫困与广泛的蛋白质缺乏直接相关.
  • 要强调考虑整个饮食模式的重要性,而不是单独摄入营养素.
  • 重新评估仅专注于蛋白质供应的干预措施的有效性.

主要方法:

  • 对有关食品消费模式的流行病学数据的分析.
  • 历史科学文献的审查,包括关于营养的开创性作品.
  • 检查来自巴西2017-2018年消费者支出调查的数据.

主要成果:

  • 唐纳德·麦克拉伦在1974年的工作中发现了专注于蛋白质供应而不考虑能源需求的缺陷.
  • 数据表明,一旦满足能源需求,蛋白质缺乏不太可能发生.
  • 在巴西,即使是最贫穷的20%的人口在2017-2018年也显示出蛋白质摄入不足的比例很小.

结论:

  • 贫困和蛋白质缺乏之间的联系往往被夸大,并基于对单一营养素的错误关注.
  • 饮食干预应优先考虑整体的饮食模式,而不是孤立的营养补充.
  • 在贫困人口中普遍存在蛋白质缺乏症的假设没有得到最近数据的支持.