The Study
Functional Soy and Lupin Protein-Based Beverages Modulate Gut Microbiome and Attenuate Metabolic Dysregulation in Adolescent Boys with Overweight and Obesity
This study is like a fair test where two groups of boys drank different protein drinks for five weeks, and scientists measured what changed in their bodies. It shows the drinks might help lower blood sugar and change gut bacteria, but it doesn't prove the drinks caused those changes for sure because only 30 boys were tested.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists gave two groups of overweight teen boys a special drink every day for five weeks—one had soy protein, the other had lupin protein. Both drinks helped their blood sugar and insulin work better, even though they didn’t lose weight.
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 mean the teens’ bodies were using insulin more efficiently, which could prevent type 2 diabetes.
- 2Lowering hunger hormones might help them eat less over time, and better gut bacteria are linked to long-term health.
- 3Both drinks lowered blood sugar by about 6–7 mg/dL and improved insulin sensitivity by 15–19%.
- 4Soy drink lowered bad fats: cholesterol down 10.4%, triglycerides down 17.1%.
- 5Lupin drink lowered hunger hormones: GIP down 20%, ghrelin down 16%.
- 6Gut bacteria that help digestion also increased.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2026
Authors
T. J. Guzmán, Lucila A. Godínez-Méndez, I. C. Soto-Luna, V. Delgado-Rizo, P. García-López, Enrique Romero-Velarde, B. Vargas-Guerrero, Israel Hurtado-Díaz, A. Salazar-Montes, C. M. Gurrola-Díaz
Related Content
Claims (10)
Obese adolescent males who drink soy and lupin protein beverages have higher insulin sensitivity than those who do not.
Obese adolescent males who drink soy and lupin protein beverages show improved metabolic markers compared to those who do not.
In adolescent boys with overweight or obesity, consuming 10 grams of soy protein daily for five weeks lowers total cholesterol by 10.4% and triglycerides by 17.1%, while lupin protein does not produce these changes.
In adolescent boys with overweight or obesity, eating soy or lupin protein every day for five weeks leads to higher diversity in gut bacteria and increased levels of Bacillota and bacteria that produce butyryl-CoA transferase.
Adolescent boys with overweight or obesity who consume 10 grams of soy or lupin protein daily for five weeks show a 15-19% reduction in HOMA2-IR and lower fasting C-peptide levels, indicating improved insulin sensitivity.
In adolescent boys with overweight or obesity, consuming soy or lupin protein every day for five weeks leads to higher gut microbiome diversity and increased levels of Bacillota and butyryl-CoA transferase-positive bacteria.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.