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Related Concept Videos

Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
Overview of Protein Metabolism01:21

Overview of Protein Metabolism

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...
Chronic Kidney Disease III: Interprofessional Care01:28

Chronic Kidney Disease III: Interprofessional Care

Chronic kidney disease (CKD) requires collaborative and comprehensive management. CKD progresses through stages and can lead to end-stage kidney disease (ESKD) if untreated. Interprofessional collaboration and patient education are crucial, enabling patients to manage their health and improve their quality of life.Diagnostic approach for chronic kidney diseaseThe diagnosis of CKD primarily focuses on the glomerular filtration rate (GFR), which assesses kidney function by measuring how well...
Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses a challenge in...
Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

Pharmacokinetics in Pediatric Patients: Drug Distribution

Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight, compared...
Parentral Nutrition: Centeral and Peripheral Parental Nutrition01:27

Parentral Nutrition: Centeral and Peripheral Parental Nutrition

Parenteral Nutrition (PN) delivers essential nutrients directly into the bloodstream, bypassing the digestive system. It is commonly used for individuals with severe digestive disorders or conditions that prevent normal nutrient absorption.
PN can be administered through two primary routes:
1. Central Parenteral Nutrition (CPN):
CPN involves delivering a high concentration of nutrients through a large vein. This is typically achieved using a Peripherally Inserted Central Catheter (PICC) or,...

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Quantification of Macronutrients Intake in a Thermogenetic Neuronal Screen using Drosophila Larvae
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Published on: June 11, 2020

Nutrition in phenylketonuria.

A MacDonald1, J C Rocha, M van Rijn

  • 1The Children's Hospital, Birmingham, UK. anita.macdonald@bch.nhs.uk

Molecular Genetics and Metabolism
|September 28, 2011
PubMed
Summary

Phenylalanine-free (phe-free) diets for PKU need updated research. Current treatments lack international standards and robust data on nutrient profiles and long-term patient outcomes.

Area of Science:

  • Metabolic disorders
  • Nutritional science
  • Biochemistry

Background:

  • Dietary management for Phenylketonuria (PKU) relies on principles established sixty years ago.
  • Current PKU dietary practices are guided by individual experience and expert opinion, lacking international consensus.
  • Specialist PKU products prioritize taste and presentation over nutritional composition.

Purpose of the Study:

  • To highlight the need for further research into the amino acid and micronutrient profiles of phenylalanine-free (phe-free) products.
  • To emphasize the lack of data on phenylalanine tolerance and the nutritional status of adult PKU patients.
  • To underscore the necessity of international collaboration for standardizing PKU nutritional care.

Main Methods:

  • Review of existing literature on PKU dietary treatment and specialized products.

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  • Analysis of variations in amino acid and micronutrient content in different phe-free formulations.
  • Identification of data gaps concerning nutrient absorption, bioavailability, and long-term patient outcomes.

    • Main Results:

    • Significant variations exist in the amino acid patterns and essential/non-essential amino acid content of phe-free products.
    • The amounts of added tyrosine and branched-chain amino acids vary, with limited data on their absorption and bioavailability.
    • Evidence suggests some micronutrients in phe-free products may be excessive, necessitating scrutiny and standardization.

    Conclusions:

    • There is a critical need for international standards for the nutritional composition of phe-free products used in PKU management.
    • Further research is required on lifelong phenylalanine tolerance, the nutritional status of adult PKU patients, and body composition in children.
    • International collaboration is essential to collect robust data and ensure the highest standard of dietary therapy for PKU.