Evidence Intelligence™
- EvidenceScore™
- Moderate
- Score 69 · Based on 2 studies
- ImpactScore™
- 50
- Neutral
- ConsistencyScore™
- 100
- consistent
Supporting studies: Based on 2 studies
Add to Evidence TrackerResearch Summary
Analyzed using Evidence Intelligence™
Plant-Based Diets Aid Weight Loss in Type 1 Diabetes
Last updated September 2, 2026
Key finding
The PDI score increased on the vegan diet (p < 0.001) from 51.8 to 60.4.
This study investigated the effects of plant-based diets on weight loss in adults with Type 1 diabetes, finding significant weight loss with a vegan diet.
Quick read
Study at a glance
The essential study design details in one scan.
EvidenceScore™
Moderate
Study type
RCTs
Follow-up
Short-Term (≤3 mo)
Risk of bias
Some Concerns
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Plain-language summary
What this paper says
A plain-language read of the study’s main message and where it applies.
Study focus
This study investigated the effects of plant-based diets on weight loss in adults with Type 1 diabetes, finding significant weight loss with a vegan diet.
Clinical relevance
This study highlights the potential of plant-based diets in managing weight for adults with Type 1 diabetes, a group often facing challenges with weight management. The findings suggest that adopting a vegan diet may not only aid in weight loss but also enhance dietary quality, which is crucial for overall health in diabetic patients.
Keep in mind
Limited generalizability due to specific population characteristics. Short duration of the study may not reflect long-term effects. Potential bias in self-reported dietary adherence.
Published in
Journal Reference
Publication details and source links for this paper.
Hana K, Ilana F, Reagan S, et al. The Effect of Plant-Based Diets on Weight Loss in Adults with Type 1 Diabetes: A Randomized Clinical Trial. Frontiers in Nutrition. 2025;12:1605769. doi:10.3389/fnut.2025.1605769
Main Effects
Participants lost 5.2 kg on the vegan diet (p < 0.001).
The Plant-Based Dietary Index (PDI) score increased significantly on the vegan diet (p < 0.001).
The Healthful Plant-Based Dietary Index (hPDI) increased more on the vegan diet (effect size +9.1; p = 0.002).
Evidence network
How this study fits
Understand where this research contributes within the broader evidence network.
Evidence Context
This study contributes evidence to Portion-controlled diet, Vegan diet and Body weight, Healthful plant-based dietary index (hPDI), Plant-based dietary index (PDI), and 1 more.
This study contributes evidence to
Primary intervention
Portion-controlled diet
Primary outcomes
- Body weight
- Healthful plant-based dietary index (hPDI)
- Plant-based dietary index (PDI)
Evidence topics
Primary intervention
Evidence relationships
Intervention and outcome relationships this study adds to the evidence network.
8
Evidence pairs
8
Relationships
1
Evidence topics
contributes_evidence
Editorial context
Why this study matters
See why this paper is useful beyond its individual results.
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.
Moderate contributionModerate confidenceNetwork score: 63
1
Related topics
8
Evidence pairs
376
Related studies
High relevance in at least one topic
Why it is useful
- Contributes to 8 evidence relationships
- Includes primary outcome data
- Linked to 1 direct semantic evidence topic
Topic contributions
Evidence topic
Contributes evidence
Add related evidence to your Evidence Tracker
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Primary evidence
Evidence topic
Weight Loss
matched_outcome
Core evidence
Study findings
The primary outcomes reported in this study.
Healthful plant-based dietary index (hPDI)
Portion-controlled diet → Healthful plant-based dietary index (hPDI)
Portion-controlled diet → Healthful plant-based dietary index (hPDI)
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 50
- Neutral
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerPlant-based dietary index (PDI)
Portion-controlled diet → Plant-based dietary index (PDI)
Portion-controlled diet → Plant-based dietary index (PDI)
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 50
- Neutral
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerUnhealthful plant-based dietary index (uPDI)
Portion-controlled diet → Unhealthful plant-based dietary index (uPDI)
Portion-controlled diet → Unhealthful plant-based dietary index (uPDI)
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 50
- Neutral
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerEvidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 100
- Very Positive
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerHealthful plant-based dietary index (hPDI)
Vegan diet → Healthful plant-based dietary index (hPDI)
Vegan diet → Healthful plant-based dietary index (hPDI)
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 100
- Very Positive
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerPlant-based dietary index (PDI)
Vegan diet → Plant-based dietary index (PDI)
Vegan diet → Plant-based dietary index (PDI)
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 100
- Very Positive
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerUnhealthful plant-based dietary index (uPDI)
Vegan diet → Unhealthful plant-based dietary index (uPDI)
Vegan diet → Unhealthful plant-based dietary index (uPDI)
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 100
- Very Positive
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
Add to Evidence TrackerEvidence Library
Build your evidence library
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Evidence Suggest
- Vegan diet led to a significant weight loss of 5.2 kg (p < 0.001).
- PDI score improved significantly on the vegan diet (p < 0.001).
- hPDI increased by 9.1 points on the vegan diet (p = 0.002).
Who this applies to
- Adults aged 18-65 with Type 1 diabetes.
- Individuals seeking weight loss strategies.
Keep in Mind
- Results may not apply to those with other types of diabetes.
- Further research is needed to assess long-term effects.
- Dietary adherence may vary among participants.
Between the Lines
- Limited generalizability due to specific population characteristics.
- Short duration of the study may not reflect long-term effects.
- Potential bias in self-reported dietary adherence.
Evidence Library
Build your evidence library
Save research, organize studies, and quickly find important evidence again.
Connected Evidence
Explore related studies, evidence collections, and research questions.
Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Portion-controlled diet and Body Weight, Portion-controlled diet and Healthful plant-based dietary index (hPDI).
Related evidence relationships
Explore in Evidence ExplorerThis study contributes to the evidence on the following intervention-outcome relationships.
Diet and Nutrition
Portion-controlled diet → Body Weight
Diet and Nutrition
Evidence Intelligence™
- EvidenceScore™
- Moderate
- Score 69 · Based on 2 studies
- ImpactScore™
- 50
- Neutral
- ConsistencyScore™
- 100
- consistent
Supporting studies: Based on 2 studies
View evidenceDiet and Nutrition
Portion-controlled diet → Healthful plant-based dietary index (hPDI)
Diet and Nutrition
Evidence Intelligence™
- EvidenceScore™
- Emerging
- Score 59 · Based on 1 study
- ImpactScore™
- 50
- Neutral
- ConsistencyScore™
- unclear
- Not enough independent studies
Supporting studies: Based on 1 study
View evidenceIncluded in these evidence collections
Curated evidence collections and hubs this study is part of.
Body Weight Evidence Hub
All studies measuring Body Weight
2 studies
outcome_hubMeasures Body Weight as a key outcome.
Portion-controlled diet Evidence Hub
All studies on Portion-controlled diet
2 studies
intervention_hubContributes to Portion-controlled diet evidence base.
Healthful plant-based dietary index (hPDI) Evidence Hub
All studies measuring Healthful plant-based dietary index (hPDI)
1 studies
outcome_hubMeasures Healthful plant-based dietary index (hPDI) as a key outcome.
Recent Diabetes Research
Latest published studies
recency_collection
Published within the last 2 years.
Explore more in Evidence Explorer
Jump to pre-filtered views in Evidence Explorer.
All studies on Portion-controlled diet and Body weight
Intervention: Portion-controlled dietOutcome: Body weight
2 results
All studies on Portion-controlled diet and Healthful plant-based dietary index (hPDI)
Intervention: Portion-controlled dietOutcome: Healthful plant-based dietary index (hPDI)
1 results
All studies on Portion-controlled diet
Intervention: Portion-controlled diet
2 results
All studies measuring Body weight
Outcome: Body weight
2 results
All studies measuring Healthful plant-based dietary index (hPDI)
Outcome: Healthful plant-based dietary index (hPDI)
1 results
Questions answered by this study
Generated from the study's connected evidence using Evidence Intelligence™.
Does Portion-controlled diet affect body weight?
Moderate Evidence
Current evidence does not show a clear effect of Portion-controlled diet on body weight.
ConsistencyScore™: Results are consistent across studies.
Ranked evidence signals
- 1
Body weight
EvidenceScore™ Moderate | EvidenceScore™ 69.0 | neutral | ConsistencyScore™ Consistent | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
Does Vegan diet affect body weight?
Emerging Evidence
Vegan diet appears to affect body weight.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Body weight
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
Does Vegan diet improve healthful plant-based dietary index (HPDI)?
Emerging Evidence
Vegan diet appears to improve healthful plant-based dietary index (HPDI).
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Healthful plant-based dietary index (hPDI)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
Does Vegan diet improve plant-based dietary index (PDI)?
Emerging Evidence
Vegan diet appears to improve plant-based dietary index (PDI).
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
- 1
Plant-based dietary index (PDI)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
- Only one supporting study is available.
Next steps
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Explore in Evidence Explorer
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All studies on Portion-controlled diet and Body weightAll studies on Portion-controlled diet and Healthful plant-based dietary index (hPDI)All studies on Portion-controlled diet and Plant-based dietary index (PDI)All studies on Portion-controlled diet and Unhealthful plant-based dietary index (uPDI)
Related research
Read related research summaries.
Vegan diet improves glycemic control in type 2 diabetesVegan diet reduces insulin use and costs in type 1 diabetesCombination Therapy Reduces HbA1c and Weight in Type 2 DiabetesDietary interventions improve glycemic control in pre-diabetic patientsExercise Improves Serum Albumin Levels in Women with Type 2 Diabetes
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