OBJECTIVE: The evidence for liquid meal replacements in diabetes has not been summarized. Our objective was to synthesize the evidence of the effect of liquid meal replacements on cardiometabolic risk factors in overweight/obese individuals with type 2 diabetes. RESEARCH DESIGN AND METHODS: Data sources included MEDLINE, EMBASE, and the Cochrane Library through 10 December 2018. We included randomized trials of ≥2 weeks assessing the effect of liquid meal replacements in weight loss diets compared with traditional weight loss diets on cardiometabolic risk factors in overweight/obese subjects with type 2 diabetes. Two independent reviewers extracted relevant data and assessed risk of bias. Data were pooled using the inverse variance method. The overall certainty of the evidence was evaluated using GRADE (Grading of Recommendations Assessment, Development and Evaluation). RESULTS: Nine trial comparisons (N = 961 [median follow-up 24 weeks]) met eligibility criteria. Mean differences were for body weight -2.37 kg (95% CI -3.30 to -1.44), BMI -0.87 kg/m2 (-1.31 to -0.42), body fat -1.66% (-2.17 to -1.15), waist circumference -2.24 cm (-3.72 to -0.77), HbA1c -0.43% (-0.66 to -0.19) (-4.7 mmol/mol [-7.2 to -2.1]), fasting glucose -0.63 mmol/L (-0.99 to -0.27), fasting insulin -11.83 pmol/L (-23.11 to -0.54), systolic blood pressure -4.97mmHg (-7.32 to -2.62), and diastolic blood pressure -1.98 mmHg (-3.05 to -0.91). There was no effect on blood lipids. The overall certainty of the evidence was low to moderate owing to imprecision and/or inconsistency. CONCLUSIONS: Liquid meal replacements in weight loss diets lead to modest reductions in body weight, BMI, and systolic blood pressure, and reductions of marginal clinical significance in body fat, waist circumference, HbA1c, fasting glucose, fasting insulin, and diastolic blood pressure. More high-quality trials are needed to improve the certainty in our estimates.

CIBER Fisiopatología de la Obesidad y Nutrición Instituto de Salud Carlos 3 Madrid Spain

College of Pharmacy and Nutrition University of Saskatchewan Saskatoon Canada

Department of Endocrinology Diabetes and Clinical Pharmacology Dubrava University Hospital Zagreb Croatia

Department of Medicine University of Toronto Toronto Canada

Department of Nutritional Sciences Faculty of Medicine University of Toronto Toronto Canada

Diabetes Centre Institute for Clinical and Experimental Medicine Prague Czech Republic

Division of Endocrinology and Metabolism St Michael's Hospital Toronto Canada

Human Nutrition Unit Institut d'Investigació Sanitària Pere i Virgili Universitat Rovira i Virgili Reus Spain

Li Ka Shing Knowledge Institute St Michael's Hospital Toronto Canada

Physicians Committee for Responsible Medicine Washington DC

School of Medicine University of Zagreb Zagreb Croatia

Toronto 3D Knowledge Synthesis and Clinical Trials Unit Clinical Nutrition and Risk Factor Modification Centre St Michael's Hospital Toronto Canada

MMW Fortschr Med. 2020 Jan;162(1):29. doi: 10.1007/s15006-020-0054-2. PubMed

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Dietary Patterns and Cardiometabolic Outcomes in Diabetes: A Summary of Systematic Reviews and Meta-Analyses