In the past nutritional management formed the cornerstone of treatment of type 2 diabetes (T2DM). More recently this aspect of treatment has received less attention as drug therapy aimed not only to lower glucose, but also to treat raised blood pressure and blood fats (including cholesterol) has been more widespread. While there is evidence to suggest that blood pressure and blood fat levels have improved, overall diabetes control has not and people with diabetes appear to be becoming progressively more overweight, following trends in the general population. The proposed study involves a randomised controlled trial in which people with T2DM continuing with their regular drug treatment and surveillance, will be randomly allocated to additionally receive intensive advice regarding diet or remain on their usual treatment in this regard. The results will be judged principally in terms of body weight, waist circumference, blood pressure, blood glucose control and blood fats.

Condition	Intervention
Type 2 Diabetes	Behavior: Intensive dietary advice

Further Study Details: 

Primary Outcomes: BMI; Glycated Haemoglobin (HbA1c); Triglycerides; Dietary intake as measured by 3-day weighed diet records; - all measures to be compared at end of study (6 months)
Secondary Outcomes: Blood pressure; Weight; Waist circumference; Total cholesterol and lipid subfractions (LDL, HDL); Fasting insulin; Lipoproteins A + B; Inflammatory markers; Urinary albumin:creatinine ratio; Quality of life; - all measures to be compared at end of study (6 months)
Expected Total Enrollment:  120

This is a 6-month pilot intervention study which seeks to determine whether adherence to an intensive evidence based dietary programme, in addition to the prescription of both cardioprotective and hypoglycaemic medications recommended for patients with diabetes, will provide health benefits in terms of reducing the risk of developing or progression of complications of diabetes (particularly cardiovascular disease).

The specific aim of the project is to compare the effects of an intensive lifestyle intervention (based on the recently published evidence based recommendations of the Nutrition Study Group of the European Association for the Study of Diabetes [3]) or usual dietary advice, in diabetic patients at high risk of cardiovascular disease, treated with cardioprotective and hypoglycaemic drugs.

Study participants will be randomised into two groups:

• The control group will receive usual dietary advice and diabetes treatment from their usual GP and practice nurse (as detailed in the Management of Type 2 Diabetes and The Assessment and Management of Cardiovascular Risk guidelines published in December 2003 [1,2]).
• In addition to usual care, the intervention group will receive intensive instruction about a recommended dietary pattern based on the recently published recommendations of the Nutrition Study Group of the European Association for the Study of Diabetes [3] and where appropriate use material, for example serving size information from the above mentioned guidelines.

Outcome will be determined by examining surrogate markers of clinical endpoints. These surrogate markers will include clinical measures (weight, body mass index, blood pressure) and appropriate tests (haemoglobin A1c, fasting insulin, blood lipids, lipoproteins, inflammatory markers, and urine albumin creatinine ratio). A quality of life questionnaire will also be administered at the beginning and end of the project.

[1] New Zealand Guidelines Group. The assessment and management of cardiovascular risk. Wellington, NZ. December, 2003. http://www.nzgg.org.nz

[2] New Zealand Guidelines Group. Management of Type 2 diabetes. Wellington, NZ. December, 2003. http://www.nzgg.org.nz

[3] Mann JI, De Leeuw I, Hermansen K, Karamanos B, Karlstrom B, Katsilambros N, Riccardi G, Rivellese AA, Rizkalla S, Slama G, Toeller M, Uusitupa M, Vessby B. Nutr Metab Cardiovasc Dis 14:373-394, 2004

Ages Eligible for Study:  up to  70 Years,  Genders Eligible for Study:  Both

Criteria

Inclusion Criteria:

• Type 2 diabetes
• Resident in Dunedin
• Aged <70 years at the time of invitation to participate
• Most recent HbA1c level within the last 12 months ≥ 7%
• Currently prescribed oral tablets or insulin or both for glycaemic control AND three of the following:
• Any pre-existing cardiovascular disease defined as a past history of myocardial infarction, angina, peripheral vascular disease, cerebrovascular accident, transient ischaemic attack
• Currently prescribed antihypertensive medication
• Currently prescribed lipid modifying medication
• Body mass index ≥30

Exclusion criteria:

• Terminal illness

Please refer to this study by ClinicalTrials.gov identifier  NCT00124553

Chris S Booker, BSc(Hons)      64-3-474-7775    chris.booker@stonebow.otago.ac.nz
Kirsten Coppell, FAFPHM      64-3-474-7774    kirsten.coppell@stonebow.otago.ac.nz

New Zealand, Otago
      Edgar National Centre for Diabetes Research, Dunedin,  Otago,  9001,  New Zealand

Study chairs or principal investigators

Jim I Mann, FRACP,  Principal Investigator,  Edgar National Centre for Diabetes Research   
Kirsten Coppell, FAFPHM,  Principal Investigator,  Edgar National Centre for Diabetes Research   

Study ID Numbers:  ENCDR_1
Last Updated:  August 1, 2005
Record first received:  July 27, 2005
ClinicalTrials.gov Identifier:  NCT00124553
Health Authority: New Zealand: Health and Disability Ethics Committees
ClinicalTrials.gov processed this record on 2005-08-02