Cited by 60Diet and metabolism studiesDietary Effects on HealthDiabetes Management and Research

Carbohydrate restriction for glycaemic control in Type 2 diabetes: a systematic review and meta‐analysis

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McArdle, P. D., Greenfield, S. M., Rilstone, S. K., Narendran, P., Haque, M. S., Gill, P. S.·2019·Diabetic Medicine

Abstract

Aim: To conduct a systematic review and meta‐analysis to evaluate the effect of carbohydrate restriction on glycaemic control in Type 2 diabetes. Methods: We searched Medline, EMBASE and CINAHL for the period between 1976 and April 2018. We included randomized controlled trials comparing carbohydrate restriction with a control diet which aimed to maintain or increase carbohydrate intake, and that reported HbA 1c as an outcome and reported the amount of carbohydrate consumed during or at the end of the study, with outcomes reported at ≥3 months. Results: We identified 1402 randomized controlled trials, 25 of which met the inclusion criteria, incorporating 2132 participants for the main outcome. Definitions of low carbohydrate varied among the studies. The pooled effect estimate from meta‐analysis was a weighted mean difference of –0.09% [95% CI –0.27, 0.08 (P = 0.30); I2 72% (P <0.001)], suggesting no effect on HbA 1c of restricting the quantity of carbohydrate. A subgroup analysis of diets containing 50–130 g carbohydrate resulted in a pooled effect estimate of –0.49% [95% CI –0.75, –0.23 (P <0.001); I2 0% (P = 0.56)], suggesting a clinically and statistically significant effect on HbA 1c in favour of low‐carbohydrate diets in studies of ≤6 months’ duration. Conclusions: There was no overall pooled effect on HbA 1c in favour of restricting carbohydrate; however, restriction of carbohydrate to 50–130 g per day had beneficial effects on HbA 1c in trials up to 6 months. Future randomized controlled trials should be of >12 months’ duration, assess pre‐study carbohydrate intake, use recognized definitions of low‐carbohydrate diets and examine reasons for non‐adherence to prescribed diets in greater detail.

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Authors
McArdle, P. D., Greenfield, S. M., Rilstone, S. K., Narendran, P., Haque, M. S., & Gill, P. S.
Affiliations
  • Birmingham Community Healthcare NHS Trust (GB)
  • University of Birmingham (GB)
  • Imperial College Healthcare NHS Trust (GB)
  • Institute of Applied Health Research University of Birmingham Birmingham UK
  • University of Warwick (GB)
Corresponding author
McArdle, P. D.
Venue
Diabetic Medicine
Publisher
Wiley
Published
2019-01-03
Volume
36
Issue
3
Pages
335-348
ISSN
  • 0742-3071 (ISSN-L)
  • 1464-5491
OpenAlex
W2901853735
Cited by
60
References
53
Citations by year
2026: 3 · 2025: 5 · 2024: 7 · 2023: 9 · 2022: 8 · 2021: 16 · 2020: 8 · 2019: 3
FWCI
0.89
Type
journal article
Language
en
Locations
  • Diabetic Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Warwick Research Archive Portal (University of Warwick) (acceptedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion, other-oa)
  • Warwick Research Archive Portal (University of Warwick) (submittedVersion)
Funders
National Institute for Health Research
Topics
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
  • Health Sciences › Medicine › Physiology › Dietary Effects on Health
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
Keywords
carbohydrate restriction, low-carbohydrate diet, type 2 diabetes, glycemic control, HbA1c, dietary intervention, dietary adherence
MeSH terms
Blood Glucose, Diabetes Mellitus, Type 2, Dietary Carbohydrates, Glycated Hemoglobin, Humans, Randomized Controlled Trials as Topic, Glycemic Index, Diet, Carbohydrate-Restricted

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