Evidence map›Paper›PMID 37630696›Full record

SynthesisNutrients2023

Phenylalanine Tolerance over Time in Phenylketonuria: A Systematic Review and Meta-Analysis.

Alex Pinto, Fatma Ilgaz, Sharon Evans, Esther van Dam, Júlio César Rocha, Erdem Karabulut, Mary Hickson, Anne Daly, Anita MacDonald

Abstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Nutrients, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

12 citing papers in PubMed.

  1. Article
  2. Mapping the Severity of Phenylalanine Hydroxylase Deficiency.Journal of inherited metabolic disease · 2026
    Review
  3. Article
  4. Review
  5. Article
  6. Review
  7. Article
  8. Phenylketonuria as an Adherence Disease.Patient preference and adherence · 2025
    Review
  9. Article
  10. Article
  11. Article
  12. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Alex PintoDepartment of Dietetics, Birmingham Women's and Children's Hospital, Birmingham B4 6NH, UK.
Fatma IlgazDepartment of Nutrition and Dietetics, Faculty of Health Sciences, Hacettepe University, 06100 Ankara, Turkey.
Sharon EvansDepartment of Dietetics, Birmingham Women's and Children's Hospital, Birmingham B4 6NH, UK.ORCID 0000-0002-7654-3621
Esther van DamBeatrix Children's Hospital, University of Groningen, University Medical Center, 9700 RB Groningen, The Netherlands.
Júlio César RochaNutrition and Metabolism, NOVA Medical School, Faculdade de Ciencias Medicas, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal.ORCID 0000-0002-4977-8345
Erdem KarabulutDepartment of Biostatistics, Faculty of Medicine, Hacettepe University, 06100 Ankara, Turkey.ORCID 0000-0002-7811-8215
Mary HicksonSchool of Health Professions, Faculty of Health, University of Plymouth, Plymouth PL4 6AB, UK.ORCID 0000-0001-7996-0095
Anne DalyDepartment of Dietetics, Birmingham Women's and Children's Hospital, Birmingham B4 6NH, UK.ORCID 0000-0003-2579-8699
Anita MacDonaldDepartment of Dietetics, Birmingham Women's and Children's Hospital, Birmingham B4 6NH, UK.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

In phenylketonuria (PKU), natural protein tolerance is defined as the maximum natural protein intake maintaining a blood phenylalanine (Phe) concentration within a target therapeutic range. Tolerance is affected by several factors, and it may differ throughout a person's lifespan. Data on lifelong Phe/natural protein tolerance are limited and mostly reported in studies with low subject numbers. This systematic review aimed to investigate how Phe/natural protein tolerance changes from birth to adulthood in well-controlled patients with PKU on a Phe-restricted diet. Five electronic databases were searched for articles published until July 2020. From a total of 1334 results, 37 articles met the eligibility criteria (

Indexed as

PhenylalaninePhenylketonuriasAdolescentAdultChildChild, PreschoolDatabases, FactualHumansImmune ToleranceInfantLongevityPhenylalanineamino acidsmedical formulanatural proteinphenylalaninephenylalanine tolerancephenylketonuriaPKUproteinprotein substituteprotein tolerance

Identifiers

PMID37630696
PMCPMC10458574

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.