Whey Protein and Reduced Postprandial Glucose

Research synthesisLow evidenceModerate effect3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 studies, 2 reported beneficial effects (1 large, 1 moderate) of whey protein on reducing postprandial glucose, while 1 study found a neutral effect. The most commonly studied dose range was 12.5–55 g premeal, and the evidence predominantly applies to adults including pregnant women. Median study duration was only 7 days, so long-term effects are not established.

Effective dose range: 12.5–55 g premeal
Studied populations: adults, pregnant women with or without gestational diabetes mellitus

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. The one neutral study (2024) used a small sample of overweight women with impaired fasting glucose and high intra-pancreatic fat, suggesting that response may vary by metabolic status. All trials were short (≤7 days), so durability of effect is unknown.

Generated Jun 11, 2026

Doses used in studies

g/day: 4–55 (median 29.5, IQR 8.25–52.5) — 3 studies

Time to effect

Median: 7 days · IQR 7 days–7 days · Range 7 days–7 days — Reported in 1 of 3 studies

3 of 3 papersPopulation:

Whey Protein Premeal Lowers Postprandial Glucose Concentrations in Adults Compared with Water-The Effect of Timing, Dose, and Metabolic Status: a Systematic Review and Meta-analysis.
- 2023-08
- Meta-Analysis · n = 244
- The American journal of clinical nutrition 118(2)
- - Stine Smedegaard
  - Ulla Kampmann
  - Per G Ovesen
  - Henrik Støvring
  - Nikolaj Rittig
- PubMed: 37536867
- DOI: 10.1016/j.ajcnut.2023.05.012
5 Insights on
- Reduced Postprandial Glucose
- High evidence
the area under the curve for glucose was -0.9 standard deviation (SD) [-1.2 SD; -0.6 SD]
Effect
Beneficial
Effect size
Large
Significant
Yes
Dose
between 4 and 55 g
Premeal Whey Protein Lowers Postprandial Blood Glucose in Women With Gestational Diabetes Mellitus: A Randomized, Crossover Clinical Trial.
- 2025-04-22
- RCT
- Diabetes care 48(6)
- - Stine Smedegaard
  - Ulla Kampmann
  - Per G Ovesen
  - Louise B Suder
  - Janni H Knudsen
  - Gregers Wegener
  - Lise H Brunsgaard
  - Nikolaj Rittig
- PubMed: 40261798
- DOI: 10.2337/dc24-2831
2 Insights on
- Reduced Postprandial Glucose
- High evidence
- Pregnant Women
Premeal whey consumption acutely lowers postprandial blood glucose in women with GDM and those with NGT
Effect
Beneficial
Effect size
Moderate
Significant
Yes
Dose
20 g premeal
Intra-pancreatic fat is associated with high circulating glucagon and GLP-1 concentrations following whey protein ingestion in overweight women with impaired fasting glucose: A randomised controlled trial.
- 2024-01
- RCT
- Diabetes research and clinical practice 207
- - Jia Jiet Lim
  - Ivana R Sequeira-Bisson
  - Wilson C Y Yip
  - Louise W Lu
  - Jennifer L Miles-Chan
  - Sally D Poppitt
- PubMed: 38154534
- DOI: 10.1016/j.diabres.2023.111084
4 Insights on
- Reduced Postprandial Glucose
- High evidence
- Clinical
iAUC and iCmax glucose and insulin while similar between the two IPFD groups
Effect
Neutral
Effect size
Small
Significant
No
Dose
12.5 g and 50.0 g

Whey Protein and Reduced Postprandial Glucose

Whey Protein Premeal Lowers Postprandial Glucose Concentrations in Adults Compared with Water-The Effect of Timing, Dose, and Metabolic Status: a Systematic Review and Meta-analysis.

Premeal Whey Protein Lowers Postprandial Blood Glucose in Women With Gestational Diabetes Mellitus: A Randomized, Crossover Clinical Trial.

Intra-pancreatic fat is associated with high circulating glucagon and GLP-1 concentrations following whey protein ingestion in overweight women with impaired fasting glucose: A randomised controlled trial.