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NCT Number: NCT00345722

The Effect of Strawberries in a Cholesterol-Lowering Dietary Portfolio

The purpose of this study is to determine whether addition of strawberries to a dietary portfolio of cholesterol-lowering foods will improve compliance and so increase the effectiveness of the dietary portfolio in lowering cholesterol and improving cardiovascular risk factors.

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Key information

Conditions

Hyperlipidemia Behavior Cardiovascular Diseases Dyslipidemias Health Behavior Hypercholesterolemia Hyperlipidemias Lipid Metabolism Disorders Metabolic Diseases Nutritional and Metabolic Diseases Patient Acceptance of Health Care Patient Compliance Treatment Adherence and Compliance

Age range

21 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Clinical Nutrition & Risk Factor Modification Centre, St. Michael's Hospital Health Centre

Toronto, Ontario, M5C 2T2, Canada

About this study

We have shown in 1-month metabolic studies that the dietary portfolio can lower cholesterol to the same extent as first generation statins (cholesterol-lowering drugs). In the on-going long-term 'real world' study using this dietary portfolio, only one-third of participants were able to achieve similar cholesterol reductions at the end of 1 year. Varying compliance has been identified as the main issue why the other two-thirds could not achieve a similar level of reduction. We believe the addition of strawberries to this diet, by virtue of their beneficial components (fibre and antioxidants)and by replacement of less desirable foods (fatty deserts), may further improve the CHD risk profile of a very effective cholesterol reduction strategy.

Method:

454 g of strawberries per 2000 kcal per day will be provided for a one-month period to approximately 40-50 subjects on a long-term dietary portfolio study, all of whom have been on the diet for at least 6 months to 1 year. The active dietary components consist of viscous vibers (including oat bran), soy products (including soy milk), almonds and plant sterols (sterol enriched margarine). Strawberry recipes will be used to enhance compliance of these components. Subjects will undergo the study in a randomized crossover design where the control will be the dietary portfolio with additional 65 g oatbran bread (without psyllium) replacing the strawberries.

Bloods will be taken at weeks 0, 2 and 4 of each treatment period; and at one month prior to and after the 8-week study while on the long-term dietary portfolio.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy adult men and postmenopausal women currently enrolled in the long-term dietary portfolio study
  • Body mass index <32 kg/m2
  • constant body weight over last 6 months preceding the onset of the study
  • Fasting LDL cholesterol concentration>4.1 mmol/L at diagnosis

Exclusion criteria

  • women of child-bearing potential
  • major cardiovascular event (stroke or myocardial infarction)
  • positive molecular diagnosis of familial hypercholesterolemia
  • secondary causes of hypercholesterolemia (hypothyroidism, unless treated & on a stable dose of L-thyroxine, renal or liver disease)
  • use of cholesterol-lowering medications
  • serum triglycerides >4.5 mmmol/L
  • blood pressure > 145/90 mmHg
  • diabetes and or major disorders such as liver disease, renal failure or cancer
  • major surgery <6 months prior to randomization
  • alcohol consumption > 2 drinks per day

Treatment and study plan

strawberry dietary intervention

Procedure

Primary outcomes

  1. Total cholesterol measured at weeks 0, 2, and 4 of each phase

  2. LDL cholesterol measured at weeks 0, 2, and 4 of each phase

  3. C-reactive protein measured at weeks 0, 2 and 4 of each phase

  4. Blood pressure measured at weeks 0, 2 and 4 of each phase

Secondary outcomes

  1. Apolipoprotein A1 and B measured at weeks 0, 2, and 4 of each phase

  2. Lp(a) measured at weeks 0, 2, and 4 of each phase

  3. Oxidative stress measured at weeks 0, 2, and 4 of each phase

  4. Strawberry intake measured at weeks 0, 2, and 4 of each phase

  5. Compliance to portfolio diet components measured at weeks 0, 2 and 4 of each phase

  6. 24 hour urinary potassium measured at weeks 0 and 4 of each phase

  7. 24 hour urinary calcium measured at weeks 0 and 4 of each phase

Sponsors and collaborators

Lead sponsor

University of Toronto

Other

Collaborators

  • Almond Board of California
  • California Strawberry Commission
  • Natural Sciences and Engineering Research Council, Canada
  • Unilever R&D

Registry information

Official study title

The Long-Term Effect of Viscous Fibers, Soy Protein, and Plant Sterol Foods in Combination on Serum Cholesterol and Other Risk Factors for Cardiovascular Disease

Important dates

Study start
2006
Study completion
2007
First posted
Jun 28, 2006
Registry last updated
May 8, 2007

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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