Last updated August 23, 2026
Key finding
An increase in insulin sensitivity was significantly greater in the experimental group than in the control group [30% (95% CI 24.5–39) vs. 20% (95% CI 14–25), P = 0.04].
A calorie-restricted vegetarian diet significantly improved insulin sensitivity in Type 2 diabetes patients compared to a conventional diabetic diet.
Quick read
The essential study design details in one scan.
EvidenceScore™
Moderate
Study type
RCTs
Follow-up
Medium-Term (3–12 mo)
Risk of bias
Some Concerns
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Plain-language summary
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Study focus
A calorie-restricted vegetarian diet significantly improved insulin sensitivity in Type 2 diabetes patients compared to a conventional diabetic diet.
Improving insulin sensitivity is vital for managing Type 2 diabetes, as it can lead to better blood sugar control and reduced risk of complications. The findings suggest that dietary modifications, specifically a calorie-restricted vegetarian diet, could be an effective strategy for patients struggling with insulin resistance, potentially leading to improved health outcomes and quality of life.
The study's sample size may limit the generalizability of the findings. The duration of the intervention was not specified, which could affect long-term applicability. Potential confounding factors were not fully explored.
Published in
Publication details and source links for this paper.
H K, M M, H M, et al. A calorie-restricted vegetarian diet improves insulin sensitivity in patients with Type 2 diabetes. Diabetic Medicine. 2011;28(5):549-559. doi:10.1111/j.1464-5491.2010.03209.x
Insulin sensitivity increased by 30% in the experimental group (P = 0.04).
Visceral fat volume decreased significantly in the experimental group (P = 0.007).
Subcutaneous fat volume also decreased significantly in the experimental group (P = 0.02).
Evidence network
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This study contributes evidence to Calorie-restricted vegetarian diet, Traditional diabetic diet (TDD) and Insulin sensitivity, Oxidative stress markers (GSH), Subcutaneous Fat Reduction, and 1 more.
This study contributes evidence to
Primary intervention
Calorie-restricted vegetarian diet
Primary outcomes
Evidence topics
Primary intervention
Intervention and outcome relationships this study adds to the evidence network.
Editorial context
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Evidence network role
This section describes how the study fits into the current evidence network. It does not determine whether an intervention works on its own.
1
Related topics
8
Evidence pairs
94
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Evidence topic
Contributes evidence
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Primary evidence
Evidence topic
matched_outcome
Core evidence
The primary outcomes reported in this study.
Calorie-restricted vegetarian diet → Insulin sensitivity
Calorie-restricted vegetarian diet → Insulin sensitivity
Calorie-restricted vegetarian diet → Oxidative stress markers (GSH)
Calorie-restricted vegetarian diet → Oxidative stress markers (GSH)
Calorie-restricted vegetarian diet → Subcutaneous Fat Reduction
Calorie-restricted vegetarian diet → Subcutaneous Fat Reduction
Calorie-restricted vegetarian diet → Visceral Fat Reduction
Calorie-restricted vegetarian diet → Visceral Fat Reduction
Traditional diabetic diet (TDD) → Insulin sensitivity
Traditional diabetic diet (TDD) → Insulin sensitivity
Traditional diabetic diet (TDD) → Oxidative stress markers (GSH)
Traditional diabetic diet (TDD) → Oxidative stress markers (GSH)
Traditional diabetic diet (TDD) → Subcutaneous Fat Reduction
Traditional diabetic diet (TDD) → Subcutaneous Fat Reduction
Traditional diabetic diet (TDD) → Visceral Fat Reduction
Traditional diabetic diet (TDD) → Visceral Fat Reduction
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Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Calorie-restricted vegetarian diet and Insulin Resistance, Calorie-restricted vegetarian diet and Oxidative Stress Markers.
This study contributes to the evidence on the following intervention-outcome relationships.
Diet and Nutrition
Diet and Nutrition
Curated evidence collections and hubs this study is part of.
All studies on Calorie-restricted vegetarian diet
Contributes to Calorie-restricted vegetarian diet evidence base.
All studies measuring Insulin Resistance
Measures Insulin Resistance as a key outcome.
All studies measuring Oxidative Stress Markers
Measures Oxidative Stress Markers as a key outcome.
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1 results
1 results
1 results
1 results
1 results
Generated from the study's connected evidence using Evidence Intelligence™.
Calorie-restricted vegetarian diet appears to improve insulin sensitivity.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Insulin sensitivity
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Calorie-restricted vegetarian diet appears to improve oxidative stress markers (GSH).
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Oxidative stress markers (GSH)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Calorie-restricted vegetarian diet appears to reduce subcutaneous fat reduction.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Subcutaneous Fat Reduction
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Calorie-restricted vegetarian diet appears to reduce visceral fat reduction.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Visceral Fat Reduction
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
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