Last updated September 2, 2026
Key finding
HbA1c decreased by 1.9 [−3.5, −0.3] mmol/mol after 6 weeks.
A 6-week carbohydrate-restricted high-protein diet reduced HbA1c levels in people with Type 2 diabetes but did not enhance β-cell function.
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 6-week carbohydrate-restricted high-protein diet reduced HbA1c levels in people with Type 2 diabetes but did not enhance β-cell function.
These findings suggest that while a carbohydrate-restricted diet can be beneficial for lowering HbA1c levels, it may not address other critical aspects of diabetes management, such as improving insulin sensitivity or β-cell function. This highlights the need for comprehensive dietary strategies in managing Type 2 diabetes.
Limited sample size may affect generalizability. Short duration of the study may not capture long-term effects. Lack of improvement in β-cell function raises questions about dietary effectiveness.
Published in
Publication details and source links for this paper.
Mads NT, Mads JS, Amirsalar S, et al. A Moderately Carbohydrate-Restricted Diet for 6 Weeks Decreases HbA1c but Does Not Improve β-Cell Function in People with Type 2 Diabetes. Frontiers in Nutrition. 2022;9:933118. doi:10.3389/fnut.2022.933118
HbA1c decreased by 1.9 mmol/mol after 6 weeks (p=0.01).
C-peptide concentration increased significantly (~10%) with the CRHP diet.
Insulin secretion rate (AUC) increased significantly (~10%) with the CRHP diet.
Basal triglyceride decreased by ~20% with the CRHP diet.
Evidence network
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This study contributes evidence to Low-carbohydrate diet and 2-hour plasma glucose, Basal glucagon, Basal proinsulin secretion, and 9 more.
This study contributes evidence to
Primary intervention
Low-carbohydrate diet
Primary outcomes
Evidence topics
Primary intervention
Primary outcomes
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
12
Evidence pairs
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Contributes evidence
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Contributes evidence
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Contributes evidence
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Contributes evidence
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Primary evidence
Evidence relationship
Related evidence
Evidence relationship
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Core evidence
The primary outcomes reported in this study.
Low-carbohydrate diet → 2-hour plasma glucose
Low-carbohydrate diet → 2-hour plasma glucose
Low-carbohydrate diet → Basal proinsulin secretion
Low-carbohydrate diet → Basal proinsulin secretion
Low-carbohydrate diet → Basal triglyceride
Low-carbohydrate diet → Basal triglyceride
Low-carbohydrate diet → Gastric inhibitory polypeptide total AUC
Low-carbohydrate diet → Gastric inhibitory polypeptide total AUC
Low-carbohydrate diet → Insulin sensitivity
Low-carbohydrate diet → Insulin sensitivity
Low-carbohydrate diet → Postprandial insulin incremental area under the curve (iAUC0–3h)
Low-carbohydrate diet → Postprandial insulin incremental area under the curve (iAUC0–3h)
Low-carbohydrate diet → Total triglyceride AUC
Low-carbohydrate diet → Total triglyceride AUC
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Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Low-Carbohydrate Diet Education and HbA1c, Low-Carbohydrate Diet Education and Postprandial and OGTT Glucose.
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 HbA1c
Measures HbA1c as a key outcome.
All studies on Low-Carbohydrate Diet Education
Contributes to Low-Carbohydrate Diet Education evidence base.
All studies measuring Postprandial and OGTT Glucose
Measures Postprandial and OGTT Glucose as a key outcome.
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19 results
3 results
19 results
19 results
3 results
Generated from the study's connected evidence using Evidence Intelligence™.
Low-Carbohydrate Diet Education may improve insulin resistance.
ConsistencyScore™: Results are generally consistent across studies.
Ranked evidence signals
Insulin sensitivity
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on 9 supporting studies with generally consistent results and a positive effect signal.
Low-Carbohydrate Diet Education may lower HbA1c.
ConsistencyScore™: Results are generally consistent across studies.
Ranked evidence signals
HbA1c
EvidenceScore™ Strong | EvidenceScore™ 85.6 | moderate positive | ConsistencyScore™ Generally Consistent | 1 study
Why this answer: This answer is based on 22 supporting studies with generally consistent results and a positive effect signal.
Low-Carbohydrate Diet Education appears to improve postprandial and ogtt glucose.
ConsistencyScore™: Results are consistent across studies.
Ranked evidence signals
2-hour plasma glucose
EvidenceScore™ Strong | EvidenceScore™ 79.0 | moderate positive | ConsistencyScore™ Generally Consistent | 1 study
Why this answer: This answer is based on 5 supporting studies with consistent results and a positive effect signal.
Low-Carbohydrate Diet Education appears to improve c-peptide levels.
ConsistencyScore™: Results are mixed and should be interpreted cautiously.
Ranked evidence signals
C-peptide
EvidenceScore™ Emerging | EvidenceScore™ 54.8 | strong positive | ConsistencyScore™ Mixed | 1 study
Why this answer: This answer is cautious because the available studies report mixed findings.
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