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To investigate the effects of three different meals (different glycemic index (GI) content) on blood pressure, blood vessel function, blood glucose and lipids.

To investigate and compare the acute effects of three different meals on a range of metabolic and vascular parameters in healthy volunteers.

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12609000889257
Acronym
GI Study
Enrollment
40
Registered
2009-10-12
Start date
2009-07-13
Completion date
Unknown
Last updated
2020-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

With the increasing incidence of type 2 diabetes and heart disease, people are routinely advised to reduce the intake of sugars (high glycemic index foods) and increase the intake of whole grains and fibre rich (low glycemic index) foods. It has been suggested that consumption of whole grains and fibre rich foods leads to an improved blood glucose and triglyceride (blood fat or lipid) status, which may reduce the risk of diabetes and heart disease. On the other hand, some research suggests that increased intake of protein may be a better option than carbohydrate and fibre rich whole grains. The study aims to investigate and compare the effects of three different meals, providing different amounts of GI content or protein, on post-meal glucose, insulin, triglycerides, brachial and central blood pressure and platelet aggregation.

Interventions

Acute postprandial effects of two meals of different GI content will be tested against a control meal on a range of metabolic and vascular parameters. Participants will be required to consume three different meals, one meal per visit served in random order, with a minimum one week washout between each visit. The two meals will be 1) a low GI meal, containing 14g of protein with a GI index of 45, and 2) moderately-high protein, containing 23g of protein with a GI index of 45.

Sponsors

University of Tasmania
Lead SponsorUniversity

Study design

Allocation
Randomised controlled trial
Intervention model
Crossover
Primary purpose
Prevention
Masking
Blinded (masking used)

Eligibility

Sex/Gender
All
Age
18 Years to 80 Years
Healthy volunteers
Yes

Inclusion criteria

Males and females aged between 18 and 80 years with no self known history of heart, liver and/or kidney disease.

Exclusion criteria

Individuals taking medication for hypertension and heart disease. Also, individuals diagnosed with type-2 diabetes will be excluded from the study.

Outcome results

None listed

Source: ANZCTR · Data processed: Feb 4, 2026