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Related Concept Videos

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...
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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
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Overview of Protein Metabolism01:21

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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.
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

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In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Related Experiment Video

Updated: Mar 16, 2026

Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry
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Protein Requirements during Aging.

Glenda Courtney-Martin1,2, Ronald O Ball3, Paul B Pencharz4,5,6

  • 1Research Institute, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada. glenda.courtney-martin@sickkids.ca.

Nutrients
|August 17, 2016
PubMed
Summary
This summary is machine-generated.

Current protein recommendations for older adults may be insufficient. New research indicates elderly individuals require approximately 40% more protein than previously recommended, suggesting a need to re-evaluate dietary guidelines for seniors.

Keywords:
elderlyindicator amino acid oxidationproteinrequirements

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Area of Science:

  • Gerontology
  • Nutritional Science
  • Biochemistry

Background:

  • Current protein recommendations for the elderly are based on nitrogen balance studies and are similar to those for young adults.
  • These recommendations (0.66 g/kg/day EAR, 0.8 g/kg/day RDA) are derived from limited data, primarily from studies with protein intakes near zero nitrogen balance.

Purpose of the Study:

  • To re-evaluate protein requirements in elderly men and women using a more precise method.
  • To compare protein needs between younger and older adults and assess current recommendations.

Main Methods:

  • Utilized the indicator amino acid oxidation (IAAO) method to estimate protein requirements.
  • Assessed protein needs in both young and elderly adults, considering gender and body composition (fat-free mass).

Main Results:

  • Estimated protein requirements for elderly adults (EAR 0.9 g/kg/day, RDA 1.2 g/kg/day) were approximately 40% higher than current recommendations.
  • No significant differences in protein requirements were found based on gender or body weight between younger and older adults.

Conclusions:

  • Current protein recommendations for the elderly may be underestimated.
  • Factors such as decreased amino acid sensitivity and increased insulin resistance in older adults could explain the higher protein requirements.
  • Re-assessment of dietary protein guidelines for the elderly population is warranted.