Assessment of Glycemic Index for Dried Saskatoon Berries and Powder in Healthy Subjects

NCT06928688 | Completed DMC

• 1 other identifier: HS26810 (B2025:012)
• Study Type: interventional
• Target: 10
• Locations: 1 country
• Sites: 1

Brief Summary

The glycemic index (GI) ranks carbohydrate-containing foods based on their effect on postprandial blood glucose levels. Foods or food products with lower GI values (55 or less) are absorbed more slowly, gradually increasing blood glucose and insulin levels. Fruits are believed to have a lower GI, making them potentially beneficial for individuals seeking to manage blood sugar levels. Previous studies from our and other groups suggest that Saskatoon berry (SB) is a potential functional food for glucose management. The glycemic index (GI) of dried SB powder and whole fruit remains undetermined, limiting our ability to make precise dietary recommendations. This study aims to evaluate the GI in both whole fruit and powder forms of SB. The determination of GI on SB products allows us to provide evidence-based guidance for healthcare providers when recommending SB as a functional food for glucose control.

Conditions

Healthy Volunteers (HV)

Keywords

Postprandial glucose; Glycemic index; blood glucose

Outcome Measures

Primary Outcomes (1)

• Glycemic index

  Glyemic index after the consumption of SB powder or dried whole SB compared to glucose drink

  15-120 minutes after consumption dietary supplement

Study Arms (2)

SB powder

EXPERIMENTAL

Volunteers drink 25 g of SB powder (25g carbohydrate equivalent) with 250ml water (consumption within 10 minutes)

Dietary Supplement: Saskatoon berry powder

Dried whole SB fruit

EXPERIMENTAL

Volunteers intake Dried whole SB fruit (25g carbohydrate equivalent) within 20 minutes. Participants have option to choose intake one or both SB products. One week interval is required between the interventions.

Dietary Supplement: Saskatoon berry powder

Interventions

Saskatoon berry powder DIETARY_SUPPLEMENT

After oral intake of SB powder, dried whole SB fruit or glucose drink, finger tip blood glucose will be measured 15, 30, 45, 60, 90 and 120 minutes after the consumption.

Also known as: Dried whole Saskatoon berry, Glucose drink as control

Dried whole SB fruit; SB powder

Eligibility Criteria

• Age: 18 Years - 74 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Individuals in good health (males and females)
• Between 18 and 74 years of age
• Signed informed consent

You may not qualify if:

• Body Mass Index (BMI) \>= 30 kg/m²
• Diabetes, hyperlipidemia, and hypertension
• Taking medications for diabetes, cholesterol, or blood pressure

Sponsors & Collaborators

• University of Manitoba: lead

Study Sites (1)

University of Manitoba

Winnipeg, Manitoba, R3E 3P4, Canada

Location

Related Publications (2)

• Brouns F, Bjorck I, Frayn KN, Gibbs AL, Lang V, Slama G, Wolever TM. Glycaemic index methodology. Nutr Res Rev. 2005 Jun;18(1):145-71. doi: 10.1079/NRR2005100.

  PMID: 19079901 RESULT

• Zhao R, Khafipour E, Sepehri S, Huang F, Beta T, Shen GX. Impact of Saskatoon berry powder on insulin resistance and relationship with intestinal microbiota in high fat-high sucrose diet-induced obese mice. J Nutr Biochem. 2019 Jul;69:130-138. doi: 10.1016/j.jnutbio.2019.03.023. Epub 2019 Apr 9.

  PMID: 31078906 RESULT

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Model Details: Volunteers will receive SB powder, whole dried SB fruit or glucose drink with matching carbohydrate as control with 1 week interval between any two tests.

Study Record Dates

• First Submitted: March 31, 2025
• First Posted: April 15, 2025
• Study Start: March 1, 2025
• Primary Completion: November 20, 2025
• Study Completion: November 20, 2025
• Last Updated: January 8, 2026

Record last verified: 2025-11

Data Sharing

• IPD Sharing: Will not share

Locations

CA (1)