Effect of Flax in Yogurt on Blood Cyanide Levels

Not Applicable

Not yet recruiting

• Conditions: Healthy
• Interventions: Dietary Supplement: 40 g of whole intact flaxseeds; Dietary Supplement: 28 g flax hulls; Dietary Supplement: 0 g Flax; Dietary Supplement: 40 g whole ground flaxseed; Dietary Supplement: 40 g roasted then ground whole flaxseed

• Registration Number: NCT06491095
• Lead Sponsor: St. Boniface Hospital

Brief Summary

A randomized, controlled, cross-over post-prandial trial in healthy human volunteers will be conducted at the IH Asper Institute to determine the effect whole ground flaxseed, roasted then ground whole flaxseed, whole intact flaxseed and flaxseed hulls mixed into yogurt on blood cyanide levels.

Detailed Description

Participants will receive yogurt containing the following flaxseed products in a random order:

1. 40 g ground flaxseed, untreated;

2. 40 g ground flaxseed, roasted before grinding;

3. 40 g intact whole flaxseed;

4. 28 g flaxseed hulls;

5. 0 g flaxseed.

Venous blood will be collected at the following time points: 0 (before consumption of test product), 15, 30, 45, 60, 75, 90, 120, 150, 180 min.

Urine will be collected prior to consumption of test product and 180 min.

Primary endpoints: 1) Peak blood level of cyanide and incremental area under the curve (iAUC) for cyanide in blood over a 3h postprandial period. Secondary endpoint: 1) cyanogenic glycoside and thiocyanate concentrations in plasma and urine over a 3h postprandial period.

Tertiary endpoints: 1) metabolic profile in plasma and urine over 3 h postprandial period.

Study Timeline

• Study First Submitted: 2024-06-05
• Study First Submitted QC: 2024-07-05
• Study First Posted: 2024-07-08
• Status Verified: 2024-11
• Last Update Submitted: 2024-11-26
• Last Update Posted: 2024-12-02
• Study Start: 2025-01-16
• Primary Completion: 2025-03-28
• Study Completion: 2026-03-28

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 12

Inclusion Criteria

1. Generally healthy adult, 18 years or older;
2. Willing to provide informed consent;
3. Willing/able to comply with the requirements of the study.

Exclusion Criteria

1. Pregnant or lactating;
2. Medical history of disease that is currently under treatment;
3. Active treatment for any type of cancer within 1 year prior to study start;
4. Presence of a gastrointestinal disorder, daily use of any stomach acid-lowering medications or laxatives (including fibre supplements) within the past month or antibiotic use within the past 6 weeks;
5. Plasma concentration of vitamin B12 < 148 pmol/L;
6. Complete blood count outside normal range;
7. Medical history of liver disease or liver dysfunction (defined as plasma AST or ALT ≥3 times the upper limit of normal (ULN));
8. Fasting blood glucose ≥6.1 mmol/L and/or HbA1c ≥6.0%;
9. Fasting plasma total cholesterol >7.8 mmol/L;
10. Fasting plasma HDL <0.9 mmol/L;
11. Fasting plasma LDL >5.0 mmol/L;
12. Fasting plasma triglycerides >2.3 mmol/L;
13. Systolic blood pressure >140 mmHg or diastolic blood pressure >90 mmHg;
14. Major surgery within the last 3 months;
15. Smoking, use of tobacco, vape or cannabis (within the last week);
16. Allergies to flaxseed or yogurt;
17. Aversion or unwillingness to eat study foods;
18. Participation in another clinical trial, current or in the past 4 weeks

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
40 g of whole intact flaxseeds	40 g of whole intact flaxseeds	175 g yogurt with 40 g of whole intact flaxseeds
28 g flax hulls	28 g flax hulls	175 g yogurt with 28 g flax hulls
No Flax Product	0 g Flax	175 g yogurt containing no flax product
40 g whole ground flaxseed	40 g whole ground flaxseed	175 g yogurt with 40 g whole ground flaxseed
40 g roasted then ground whole flaxseed	40 g roasted then ground whole flaxseed	175 g yogurt with 40 g roasted then ground whole flaxseed

Primary Outcome Measures

Name	Time	Method
iAUC blood cyanide	180 min	incremental area under the curve for cyanide from 0-180 min
Peak blood level of cyanide	180 minutes	highest concentration of cyanide during 180 min postprandial period

Secondary Outcome Measures

Name	Time	Method
Cyanogenic glycoside and thiocyanate concentrations in plasma and urine	180 minutes

Trial Locations

Locations (1)

I. H. Asper Clinical Research Institute; 🇨🇦 Winnipeg, Manitoba, Canada