Please note that the copy function is not enabled for this field.
If you wish to
modify
existing outcomes, please copy and paste the current outcome text into the Update field.
LOGIN
CREATE ACCOUNT
LOGIN
CREATE ACCOUNT
MY TRIALS
REGISTER TRIAL
FAQs
HINTS AND TIPS
DEFINITIONS
Trial Review
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been endorsed by the ANZCTR. Before participating in a study, talk to your health care provider and refer to this
information for consumers
Download to PDF
Trial registered on ANZCTR
Registration number
ACTRN12607000154404
Ethics application status
Approved
Date submitted
1/03/2007
Date registered
5/03/2007
Date last updated
16/08/2012
Type of registration
Prospectively registered
Titles & IDs
Public title
Fibre, protein and insulin resistance diet study
Query!
Scientific title
A randomised, controlled dietary intervention to evaluate the effect on a high protein and high fibre diet on insulin sensitivity and markers of cardiovascular disease risk in healthy, overweight women.
Query!
Secondary ID [1]
281041
0
IR-Diet
Query!
Universal Trial Number (UTN)
Query!
Trial acronym
IR-DIET
Query!
Linked study record
Query!
Health condition
Health condition(s) or problem(s) studied:
Insulin resistance in healthy overweight women.
1654
0
Query!
Diabetes prevention in healthy overweight women.
1655
0
Query!
Metabolic syndrome in healthy overweight women.
1656
0
Query!
Condition category
Condition code
Metabolic and Endocrine
1760
1760
0
0
Query!
Diabetes
Query!
Diet and Nutrition
1761
1761
0
0
Query!
Obesity
Query!
Intervention/exposure
Study type
Interventional
Query!
Description of intervention(s) / exposure
Participants will be randomised to one of 2 diets for 10 weeks. The diets will be:
1) a control diet based on best practices for nutritional counselling and the New Zealand dietary guidelines and food pyramid
Participants will be required to maintain their baseline weight for the first 4 weeks. From week 5 participants will be counselled to eat as much as required to feel satisfied while adhering to their dietary regime.
Participants will meet with a study researcher on a weekly basis for 20 minute nutritional counselling sessions and to be weighed.
Query!
Intervention code [1]
1595
0
Lifestyle
Query!
Comparator / control treatment
2) a high protein, high fibre diet (30% protein, 25% fat, 45% carbohydrate, 35-40 g total dietary fibre).
Query!
Control group
Active
Query!
Outcomes
Primary outcome [1]
2458
0
Insulin resistance measured by both a new dynamic method and Homeostasis Model Assessment for Insulin Resistance (HOMA-IR)
Query!
Assessment method [1]
2458
0
Query!
Timepoint [1]
2458
0
At baseline, 4 weeks and 10 weeks.
Query!
Secondary outcome [1]
4224
0
Weight
Query!
Assessment method [1]
4224
0
Query!
Timepoint [1]
4224
0
At baseline, 4 weeks and 10 weeks.
Query!
Secondary outcome [2]
4225
0
Fasting plasma lipids, glucose, insulin, C-Reactive protein (CRP), plasminogen activator inhibitor-1 (PAI-1), adiponectin, interleukin 6 (IL6), interleukin 18 (IL18), tumour necrosis factor alpha and grehlin; and percentage body fat mass and lean mass, and waist and hip circumference.
Query!
Assessment method [2]
4225
0
Query!
Timepoint [2]
4225
0
At baseline and 10 weeks
Query!
Eligibility
Key inclusion criteria
Overweight; BMI = 27 kg/m2 and weight < 120 kg or BMI >23 kg/m2 and a direct family history of type 2 diabetes.Normal or impaired glucose tolerance.Weight stable over last 3 months and willing to maintain weight initially.Prepared to undergo dietary intervention and eat substantial amounts of dietary fibre including wholegrains, legumes and pulses.
Query!
Minimum age
18
Years
Query!
Query!
Maximum age
65
Years
Query!
Query!
Sex
Females
Query!
Can healthy volunteers participate?
No
Query!
Key exclusion criteria
No diabetes, history of cardiovascular disease, or renal or hepatic failure.Not suffering from any other major medical condition.No psychiatric illness, drug or alcohol dependence that would affect ability to adhere to the dietary guidelines.Not pregnant or lactating.
Query!
Study design
Purpose of the study
Prevention
Query!
Allocation to intervention
Randomised controlled trial
Query!
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Sealed opaque envelopes containing treatment assignation will be prepared by a research assitant who is not involved in the study in any other way and allocation to participants in sequential order.
Query!
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Individuals will be randomised to treatment groups stratified by age and BMI. Strata will be randomised in random sized blocks using the randomisation commands in Microsoft Excel.
Query!
Masking / blinding
Open (masking not used)
Query!
Who is / are masked / blinded?
Query!
Query!
Query!
Query!
Intervention assignment
Parallel
Query!
Other design features
Query!
Phase
Phase 1
Query!
Type of endpoint/s
Safety/efficacy
Query!
Statistical methods / analysis
Query!
Recruitment
Recruitment status
Completed
Query!
Date of first participant enrolment
Anticipated
12/03/2007
Query!
Actual
Query!
Date of last participant enrolment
Anticipated
Query!
Actual
Query!
Date of last data collection
Anticipated
Query!
Actual
Query!
Sample size
Target
72
Query!
Accrual to date
Query!
Final
Query!
Recruitment outside Australia
Country [1]
483
0
New Zealand
Query!
State/province [1]
483
0
Query!
Funding & Sponsors
Funding source category [1]
1913
0
Government body
Query!
Name [1]
1913
0
New Zealand Foundation of Research Sciences and Technology Project DRIX0401.
Query!
Address [1]
1913
0
Ministry of Business, Innovation & Employment (MBIE)
PO Box 5762
Wellington 6145
Query!
Country [1]
1913
0
New Zealand
Query!
Primary sponsor type
Individual
Query!
Name
Dr Kirsten McAuley
Query!
Address
Department of Human Nutrition
University of Otago
PO Box 56
Dunedin 9054
Query!
Country
New Zealand
Query!
Secondary sponsor category [1]
1725
0
Individual
Query!
Name [1]
1725
0
Professor Jim Mann
Query!
Address [1]
1725
0
Departments of Human Nutrition and Medicine
University of Otago
PO Box 56
Dunedin 9054
Query!
Country [1]
1725
0
New Zealand
Query!
Ethics approval
Ethics application status
Approved
Query!
Ethics committee name [1]
3557
0
University of Otago
Query!
Ethics committee address [1]
3557
0
Query!
Ethics committee country [1]
3557
0
New Zealand
Query!
Date submitted for ethics approval [1]
3557
0
Query!
Approval date [1]
3557
0
20/01/2007
Query!
Ethics approval number [1]
3557
0
06/182
Query!
Summary
Brief summary
Insulin resistance (IR) is an underlying cause of most cases of type 2 diabetes. The prevalence of diagnosed diabetes in New Zealand is estimated to be 4% in the general New Zealand population and as high as 12% in Maori and Pacific Peoples. These are likely to be underestimates and the prevalence is further increased when including estimates of undiagnosed cases. Furthermore diabetes is believed to be increasing at an alarming rate in New Zealand and throughout the world. Given that IR is associated with severe health risks including obesity, high blood pressure, dyslipidaemia (abnormal blood fats), raised blood sugar and damage to blood vessels it is not surprising that insulin resistance is also associated with a significant increase in cardiovascular disease (CVD) risk in both diabetic and non-diabetic adults.
Lifestyle interventions indicate that improvements in insulin sensitivity of 20-30% may be achievable. However we currently have little indication of which dietary modifications will achieve the greatest change. This study will attempt to determine the extent to which IR and other related risk factors for cardiovascular disease can be reduced by a diet high in both dietary fibre and dietary protein, both with and without weight loss.
Query!
Trial website
Query!
Trial related presentations / publications
Query!
Public notes
Query!
Contacts
Principal investigator
Name
27529
0
Query!
Address
27529
0
Query!
Country
27529
0
Query!
Phone
27529
0
Query!
Fax
27529
0
Query!
Email
27529
0
Query!
Contact person for public queries
Name
10784
0
Lisa Te Morenga
Query!
Address
10784
0
Department of Human Nutrition
University of Otago
PO Box 56
Dunedin
Query!
Country
10784
0
New Zealand
Query!
Phone
10784
0
+64-3-4793978
Query!
Fax
10784
0
+64-3-4795405
Query!
Email
10784
0
[email protected]
Query!
Contact person for scientific queries
Name
1712
0
Lisa Te Morenga
Query!
Address
1712
0
Department of Human Nutrition
University of Otago
PO Box 56
Dunedin
Query!
Country
1712
0
New Zealand
Query!
Phone
1712
0
+64-3-4793978
Query!
Fax
1712
0
+64-3-4795405
Query!
Email
1712
0
[email protected]
Query!
No information has been provided regarding IPD availability
What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
Source
Title
Year of Publication
DOI
Embase
The effect of a diet moderately high in protein and fiber on insulin sensitivity measured using the dynamic insulin sensitivity and secretion test (DISST).
2017
https://dx.doi.org/10.3390/nu9121291
N.B. These documents automatically identified may not have been verified by the study sponsor.
Download to PDF