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Walnut Intervention on Metabolic Syndrome (WIMS)

The recruitment status of this study is unknown because the information has not been verified recently.
Verified March 2009 by Chinese Academy of Sciences.
Recruitment status was  Recruiting
California Walnut Commission
Information provided by:
Chinese Academy of Sciences Identifier:
First received: August 27, 2008
Last updated: March 27, 2009
Last verified: March 2009

The purpose of this study is to determine whether a daily supplement of 30 grams of walnut is effective in the treatment of metabolic syndrome (MetS).

Condition Intervention Phase
Metabolic Syndrome X
Dietary Supplement: walnut
Behavioral: TLC diet education
Phase 2
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: The Effects of Walnut Supplement on Cardio-Metabolic Risk Factors in Patients With Metabolic Syndrome

Resource links provided by NLM:

Further study details as provided by Chinese Academy of Sciences:

Primary Outcome Measures:
  • Plasma Low-density-lipoprotein (LDL) cholesterol [ Time Frame: 12 weeks ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Total cholesterol, triglyceride, HDL-C, fasting glucose and insulin, HbA1C, blood pressure, CRP, IL-6, adiponectin, RBP4, E-selectin, ICAM-1, VCAM-1, and fatty acid profiles of the red blood cells. [ Time Frame: 12 weeks ] [ Designated as safety issue: No ]

Estimated Enrollment: 200
Study Start Date: March 2009
Estimated Study Completion Date: September 2009
Estimated Primary Completion Date: June 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: A
TLC diet education + 30 grams/day supplement of walnut
Dietary Supplement: walnut
30 grams/day supplement of walnut for 12 weeks
Behavioral: TLC diet education
TLC diet education
Sham Comparator: B
TLC diet education
Behavioral: TLC diet education
TLC diet education

Detailed Description:

Metabolic syndrome (MetS), a constellation of metabolic abnormalities including central obesity, dyslipidemia, elevated blood pressure and hyperglycemia, is associated with the development of type 2 diabetes and CVD. It has become one of the major public health challenges in China due to rapidly nutrition transition and the nature of obesity epidemic. Treatment of MetS in China is very important for the prevention of the epidemic of its consequences (such as CVD and type 2 diabetes).

Compelling evidence from recent human studies has demonstrated that diet and lifestyle modifications are effective means in MetS management. Walnut is a complex food source containing high amounts of polyunsaturated fatty acids (PUFA), as well as plant protein, Vitamin E and other substances that may have an impact on health. Therefore, the aim of this study is to investigate the effect of walnut supplementation on the management of MetS in adult Chinese men and women in a randomized, controlled clinical trial. A total of 200 participants with MetS (defined by IDF criteria) will be randomly assigned to a walnut-supplemented diet (30 grams/day) or an isocaloric control diet for 12 weeks. Effects of walnut supplementation will be evaluated by measuring metabolic profile (BMI, blood pressure, total cholesterol, triglyceride, LDL-C and HDL-C, fasting glucose and insulin, HbA1C), inflammatory markers (CRP and IL-6), markers of endothelial function (E-selectin, ICAM-1 and VCAM-1), and fatty acid profile.


Ages Eligible for Study:   35 Years to 60 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • The International Diabetes Federation (IDF) criteria for the diagnosis of the MetS will be used. MetS will be defined with central obesity (defined as waist circumference ≥ 80 cm for women or ≥ 90 cm for men) plus any two of the following four factors:

    • Raised triglycerides level: ≥ 150 mg/dL (1.7 mmol/L), or specific treatment for this lipid abnormality;
    • Reduced HDL cholesterol: < 40 mg/dL (1.0 mmol/L) in males and < 50 mg/dL (1.3 mmol/L) in females, or specific treatment for this lipid abnormality;
    • Elevated blood pressure (BP): systolic BP ≥ 130 or diastolic BP ≥ 85 mm Hg, or treatment of previously diagnosed hypertension;
    • Increased fasting plasma glucose (FPG): ≥ 100 mg/dL (5.6 mmol/L), or previously diagnosed type 2 diabetes.
  • Being able to comply with the specified feeding conditions
  • Being able to eat walnuts
  • Being between the ages of 35 and 60 years

Exclusion Criteria:

  • Pregnancy or lactation
  • Use of insulin
  • Severe kidney disease
  • Cardiovascular diseases, stroke, cancer and psychological disorders
  • Walnut allergies or frequently eating walnuts or other nuts (>90 grams/week)
  • Drug or alcohol abuse.
  Contacts and Locations
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Please refer to this study by its identifier: NCT00742742

Contact: An Pan, MSc +86-21-54920910
Contact: Ling Lu, MSc +86-21-54920910

Institute for Nutritional Sciecnes, Chinese Acadamy of Sciences Recruiting
Shanghai, China, 200031
Contact: An Pan, MSc    +86-21-54920910   
Principal Investigator: Xu Lin, MD, PhD         
Sponsors and Collaborators
Chinese Academy of Sciences
California Walnut Commission
Principal Investigator: Xu Lin, MD, PhD Institute for Nutritional Sciecnes, Chinese Acadamy of Sciences
  More Information

Additional Information:
No publications provided by Chinese Academy of Sciences

Additional publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Xu Lin, Principal Investigator, Institute for Nutritional Sciences, Chinese Academy of Sciences Identifier: NCT00742742     History of Changes
Other Study ID Numbers: CWC-2008, KSCX1-YW-02
Study First Received: August 27, 2008
Last Updated: March 27, 2009
Health Authority: China: Ethics Committee

Keywords provided by Chinese Academy of Sciences:
Blood Glucose

Additional relevant MeSH terms:
Metabolic Syndrome X
Glucose Metabolism Disorders
Insulin Resistance
Metabolic Diseases
Pathologic Processes processed this record on November 20, 2014