Metabolic Availability of Lysine From Barley in Young Adult Men

Application of the Indicator Amino Acid Oxidation Technique for the Determination of Metabolic Availability of Lysine From Barley and Oatmeal Protein, in Young Adult Men

Protein is the key determinant of growth and bodily functions. The quality of food proteins depend on their amino acid content and the amount of amino acids used by the body to make proteins. Globally Cereal Grains (CG) provide 50% of the calories and protein in the diet and exceed 80% in poorer developing countries. Barley is an important cereal grain in the diet. The protein in barley is low in the essential amino acid lysine. Hence barley protein is of low quality. Low lysine affects protein synthesis in the body. Cooking methods also affect the lysine available from foods to the body. It is important to assess the effect of different cooking methods on the lysine availability of barley.

Study Overview

• Status: Not yet recruiting
• Conditions: Healthy
• Intervention / Treatment: Dietary supplement: Barley

Detailed Description

Each subjects will receive each of up to 10 experimental diets for the Barley Study (4 reference protein diets providing, 3 Barley diets using dry cooking method, and 3 Barley diets using moist heat cooking method) in random order over a series of up to 10 experimental periods. The reference protein diet will be patterned after the AA pattern of egg protein using crystalline AA as the protein source. Three of the 4 lysine levels will be replaced by lysine provided in Barley each cooked using two different cooking methods ( dry and moist-heat).Each experiment will be conducted over 3 days.

Adaptation days:

During days 1 and 2 the subjects will be adapted to the level of lysine being studied, consuming the same diet as they will receive on day 3 (IAAO study day). The adaptation diet will be consumed as 4 equal meals.Meals will be divided into 4 equal parts to be spread evenly throughout the day and consumed in their usual environment on their usual activities of daily living.

IAAO study day/isotope delivery and sample collection day:

On the oxidation study day 3, following a 12-h overnight fast, subjects will come to the Hospital for Sick Children, Toronto, ON for a period of 5.5 h. On the oxidation study day, the diet is consumed as 9 iso-nitrogenous and iso-energetic hourly meals. Between meals, subjects are allowed to rest on bed, watch television or use a computer. Study days for each participant will be separated by ≥ 1 week. For the duration of all experiments, subjects will consume a daily multivitamin (Centrum Forte, Whitehall Robins) and 500 mg choline supplement (Nature's Way or equivalent), to ensure adequate vitamin intake. The multi vitamin supplement is provided to ensure that no vitamin cofactors are limiting in the diet which could alter metabolic pathways and functioning.

• Study Type: Interventional
• Enrollment (Estimated): 7
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Mahroukh Rafii, BSc.; Phone Number: 416-813-7454; Email: mahroukh.rafii@sickkids.ca

Study Locations

• Canada
  • Ontario
    • Toronto, Ontario, Canada, M5G1X8
      • The Hospital for Sick Children
      • Principal Investigator: Glenda Courtney-Martin, PhD
      • Contact: Mahroukh Rafii, BSc.; Phone Number: 416-813-7454; Email: mahroukh.rafii@sickkids.ca

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 40 years (Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Male, age 18 - 40 years, Healthy with no known clinical condition which would affect protein or AA metabolism, ex. Diabetes,
• Stable Body Weight (±0 to 5lb weight gain or loss in the last 3 months)
• Not on any medications that could affect protein or amino acid metabolism e.g. steroids.

Exclusion Criteria:

• Unwillingness to participate or unable to tolerate the diet
• Recent history of weight loss within the last 3 months or on a weight reducing diet Inability to tolerate study diets (ex. Allergy to ingredients).

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Meabolic Availabiliy of Barley; Healthy adult men	Dietary supplement: Barley; Assessing the metabolic availability of lysine in barley.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Phenylalanine Oxidation	Breath samples will be collected from each subject on each study day and the 13C enrichment measured by mass spectrometry. This will be plotted against phenylalanine intake in the reference and barley diets to determine the amount of lysine available in barley.	8 hrs

Collaborators and Investigators

• Sponsor: The Hospital for Sick Children
• Collaborators: Canadian Institutes of Health Research (CIHR)
• Investigators: Principal Investigator: Glenda Courtney-Martin, PhD, Associate Scientist

Study record dates

Study Major Dates

• Study Start (Estimated): December 30, 2025
• Primary Completion (Estimated): May 30, 2027
• Study Completion (Estimated): May 30, 2027

Study Registration Dates

• First Submitted: April 5, 2019
• First Submitted That Met QC Criteria: April 5, 2019
• First Posted (Actual): April 8, 2019

Study Record Updates

• Last Update Posted (Actual): May 30, 2025
• Last Update Submitted That Met QC Criteria: May 23, 2025
• Last Verified: May 1, 2025

More Information

Terms related to this study

• Other Study ID Numbers: 1000060245

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No