Last updated August 22, 2026
Key finding
GHGE decreased in the vegan group by 55% (P = 0.001)
A 12-week randomized clinical trial found that adults with type 1 diabetes on a low-fat vegan diet showed greater improvements in insulin sensitivity compared to those on a portion-controlled diet.
Quick read
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
A plain-language read of the study’s main message and where it applies.
Study focus
A 12-week randomized clinical trial found that adults with type 1 diabetes on a low-fat vegan diet showed greater improvements in insulin sensitivity compared to those on a portion-controlled diet.
These findings suggest that dietary choices can have significant impacts not only on health outcomes, such as insulin sensitivity, but also on environmental factors like greenhouse gas emissions. This dual benefit could encourage dietary shifts among individuals with type 1 diabetes, promoting both personal health and sustainability.
The study's sample size and demographic diversity may limit generalizability. The trial duration of 12 weeks may not capture long-term dietary effects. Potential confounding factors were not fully assessed.
Published in
Publication details and source links for this paper.
Reagan S, Arathi J, Brighid M, et al. A 12-wk randomized clinical trial found that adults with type 1 diabetes on a low-fat, vegan diet showed greater improvements in insulin sensitivity compared with a portion-controlled diet. Current Developments in Nutrition. 2026;10(6):107709. doi:10.1016/j.cdnut.2026.107709
The vegan diet decreased greenhouse gas emissions by 55% (P = 0.001).
The vegan diet reduced cumulative energy demand by 44% (P = 0.01).
No change in greenhouse gas emissions was observed in the portion-controlled group.
No change in cumulative energy demand was noted in the portion-controlled group.
Evidence network
Understand where this research contributes within the broader evidence network.
This study contributes evidence to Low-fat diet, Portion-controlled diet and Cumulative Energy Demand (CED), Reduction in greenhouse gas emissions (GHGE).
This study contributes evidence to
Primary intervention
Low-fat diet
Primary outcomes
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.
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Related topics
4
Evidence pairs
0
Related studies
Core evidence
The primary outcomes reported in this study.
Low-fat diet → Cumulative Energy Demand (CED)
Low-fat diet → Cumulative Energy Demand (CED)
Low-fat diet → Reduction in greenhouse gas emissions (GHGE)
Low-fat diet → Reduction in greenhouse gas emissions (GHGE)
Portion-controlled diet → Cumulative Energy Demand (CED)
Portion-controlled diet → Cumulative Energy Demand (CED)
Portion-controlled diet → Reduction in greenhouse gas emissions (GHGE)
Portion-controlled diet → Reduction in greenhouse gas emissions (GHGE)
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Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Low-fat Diets and Cumulative Energy Demand (CED), Low-fat Diets and Reduction in greenhouse gas emissions (GHGE).
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 measuring Cumulative Energy Demand (CED)
Measures Cumulative Energy Demand (CED) as a key outcome.
All studies on Low-fat Diets
Contributes to Low-fat Diets evidence base.
All studies measuring Reduction in greenhouse gas emissions (GHGE)
Measures Reduction in greenhouse gas emissions (GHGE) as a key outcome.
Latest published studies
Published within the last 2 years.
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1 results
1 results
1 results
1 results
1 results
Generated from the study's connected evidence using Evidence Intelligence™.
Low-fat diet appears to improve cumulative energy demand (CED).
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Cumulative Energy Demand (CED)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Low-fat diet appears to reduce reduction in greenhouse gas emissions (GHGE).
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Reduction in greenhouse gas emissions (GHGE)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Current evidence does not show a clear benefit of Portion-controlled diet for cumulative energy demand (CED).
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Cumulative Energy Demand (CED)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Current evidence does not show a clear reduction in reduction in greenhouse gas emissions (GHGE) with Portion-controlled diet.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Reduction in greenhouse gas emissions (GHGE)
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
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