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MA af Tryptophan i Majsmel i Raske Voksne>60 år

29. september 2026 opdateret af: Glenda Courtney-Martin, The Hospital for Sick Children

Metabolisk tilgængelighed af tryptofan i majsmel hos raske voksne >60 år

The world's population will reach 12 billion by this century's end. As the human population increases, the world faces the continuous challenge of optimizing a limited food supply. Protein is the key determinant of growth and bodily function. Recently, our group showed that current protein recommendations for adults and children are underestimated by 30-50%. Animal protein production is "more resource intensive than any other form of food production" and their high saturated fat content is linked to chronic diseases in developed nations. Plant protein sources are important alternatives shown to "enhance ecosystem resilience and improve human health". Maize, commonly known as corn, is a staple food in the diets of more than 300 million Africans and ranks as the third most produced food globally. Maize supplies up to 80% of daily energy in sub-Saharan and Southern Africa alone. It is one of the main protein sources in these countries for vegetarians. Already, over 900,000 Canadians adults are vegetarians and globally plant protein consumption is encouraged. However, maize protein is limiting in the essential amino acid (EAA) tryptophan and anti-nutritional factors can affect tryptophan bioavailability (BA). Dietary protein quality (DPQ) depends on its amino acid (AA) composition and BA. Therefore, knowledge of tryptophan BA is fundamental to understand the extent to which cereal grains meet the body's requirement for protein synthesis (PS). Efforts aimed at increasing crop production and DPQ, should coincide with DPQ evaluation directly in humans so that the gap in knowledge between protein requirement and how best to provide it can be quickly and efficiently reconciled.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Protein quality evaluation assesses the capacity of food proteins to meet the EAA needs of the body. The DPQ of plant proteins have been little studied in humans despite their importance in the diet and their well-recognized positive effects on chronic diseases. Dietary guidelines are encouraging increased plant protein consumption due to the benefits of plant protein. With the increasing interest in vegetarian diets in North America, it is imperative that the DPQ of cereal grains be evaluated so that plant protein recommendations are accompanied by an empirical understanding of plant protein quality. The information gathered from this project will provide additional experimental data in humans on plant protein quality (have completed lentils and chickpeas), on which nutrition recommendations can be built. Globally, this will also help support the FAO's commitment to compile tables on AABA of foods for global distribution. The aim of the study is to apply the IAAO method to determine the MA of tryptophan in maize prepared by moist cooking method. Six healthy older adults will be recruited to conduct a total of 40 IAAO studies in a repeated measure design. Subjects will be tested on both reference (crystalline amino acids) and maize diets. Reference and maize slope will be constructed based on the response of C13 phenylalanine oxidation. The ratio of maize slope to reference slope determines the MA/bioavailability of maize.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

6

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Ontario
      • Toronto, Ontario, Canada, M5G 1X8
        • The Hospital for Sick Children

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

60 år til 90 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Aged 60 to 90 years old.
  • In good general health as evidenced by medical history, physical health and blood draw.
  • Fasting blood glucose, hemoglobin A1c (HbA1c), urea, creatinine.
  • Willingness to participate in the study.
  • BMI <30 kg/m2.

Exclusion Criteria:

  • Presence of chronic disease and/or acute illness known to affect protein/amino acid metabolism (e.g. HIV, diabetes, taking medications known to affect protein/AA metabolism (e.g. steroids).

    • Inability to tolerate the diet (i.e. allergy).
    • Significant weight loss during the past month or consumption of weight reducing diets.
    • Significant caffeine consumption (>2 cups per day).
    • Significant consumption of alcohol (>1 drink per day i.e. 1 beer or ½ glass of wine).
    • Unwilling to have blood drawn from a venous access or using a ventilated hood indirect calorimeter for the purposes of the study.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: MA of tryptophan in maize

Apply the IAAO method to determine the metabolic availability of tryptophan in maize prepared by moist cooking method

4 different tryptophan test levels 0.5, 1, 1.5 and 2 mg.kg-1.day.1

Andre navne:
  • majs

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
MA of tryptophan in maize
Tidsramme: Up to 24 months

To measure the tryptophan metabolic availability investigators will collect breath samples from participants. From these samples, investigators will measure the amount of amino acids oxidized and how much is retained in the body when graded intakes of tryptophan are consumed by the participants consuming a controlled diet.

Up to 24 months

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Efterforskere

  • Ledende efterforsker: Glenda Courtney Martin, PhD, RD, The Hospital for Sick Children

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

29. november 2025

Primær færdiggørelse (Faktiske)

15. juli 2026

Studieafslutning (Faktiske)

15. juli 2026

Datoer for studieregistrering

Først indsendt

26. november 2025

Først indsendt, der opfyldte QC-kriterier

26. november 2025

Først opslået (Faktiske)

9. december 2025

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

2. oktober 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

29. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 3568

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .