New evidence
A 5-week trial of 10 g/day soy protein improved insulin sensitivity in overweight adolescent boys — but the effect is from a single, small study in a narrow population.
This is early evidence that soy protein might help with insulin sensitivity, but with only one study in a specific group (overweight teenage boys) and a short duration, it's far from a universal recommendation.
Overweight adolescent boys who drank a soy protein beverage daily for five weeks showed a significant improvement in insulin sensitivity, measured by the HOMA2 index. The same beverage also lowered fasting glucose, cholesterol, and triglycerides, but did not affect a gut hormone called GIP. Because the study is small, short, and the first of its kind, these results need replication before we can draw broader conclusions.
Where this fits in the evidence
This is among the first studies we've indexed on Soy Protein for Improved Insulin Sensitivity — treat it as an early signal until more research accumulates.
The study
- Randomized Controlled Trial (RCT)
- 2026-06-23
- Nutrients
- PubMed: 42451052
- DOI: 10.3390/nu18132049
- Full study breakdown →
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.