The Study
Effect of pre-meal water intake on the serum levels of Copeptin, glycemic control, lipid profile and anthropometric indices in patients with type 2 diabetes mellitus: a randomized, controlled trial
This study showed that when people with type 2 diabetes drank water before meals for 8 weeks, they tended to lose a little weight and their blood sugar and fat levels improved. But it doesn't prove the water caused those changes—maybe they ate less because they felt fuller, or something else changed. It's like noticing your phone battery lasts longer when you turn off apps—you can guess it helps, but you can't be 100% sure without testing it more carefully.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
People with type 2 diabetes who drank a liter of water before each meal for 8 weeks lost weight, had lower blood sugar, and ate less food.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 561 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — these changes are clinically meaningful: lower blood sugar and cholesterol reduce diabetes and heart disease risk, and weight loss improves insulin sensitivity.
- 2Lost 1.35 kg, dropped 1.28 BMI points, lost 3 cm from waist, lowered blood sugar by 32.6 mg/dL, triglycerides by 22 mg/dL, LDL by 13 mg/dL, and copeptin by 2.7 pmol/L.
- 3Ate 173 fewer calories and 21 fewer grams of fat per day.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of Diabetes & Metabolic Disorders
Year
2021
Authors
Gohar Sedaghat, F. Montazerifar, Mahmood Ali Keykhaie, M. Karajibani, Shadi Shourestani, A. Dashipour
Related Content
Claims (5)
Adults with type 2 diabetes who drink 1 liter of water before each meal for 8 weeks experience an average decrease of 32.6 mg/dL in fasting blood sugar and 22.05 mg/dL in triglycerides.
Adults with type 2 diabetes who drink 1 liter of water before each meal for 8 weeks have an average decrease of 13.37 mg/dL in LDL cholesterol.
Adults with type 2 diabetes who drink 1 liter of water before each meal for 8 weeks consume 173 fewer calories and 21 fewer grams of fat per day than before.
Adults with type 2 diabetes who drink 1 liter of water daily in three doses before meals for 8 weeks experience an average weight loss of 1.35 kg, a 1.28 kg/m² drop in BMI, and a 3.0 cm reduction in waist circumference, along with lower energy and fat intake.
Adults with type 2 diabetes who drink 1 liter of water before each meal for 8 weeks show a measurable decrease in serum copeptin levels by an average of 2.7 pmol/L.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.