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the claim

Whey protein supplementation increases insulin resistance.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Whey protein supplementation increases insulin resistance?

Partly. Evidence is mixed and partial: one meta-analysis in older adults reported increased fasting insulin and HOMA-IR with whey protein, and a whey-containing supplement in HIV patients was linked to higher fasting insulin, while other trials and meta-analyses found reduced or unchanged insulin resistance.

Verdict: CONTESTED PARTIAL · 2 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Effects of Whey Protein Supplementation on Body Composition, Muscular Strength, and Cardiometabolic Health in Older Adults: A Systematic Review with Pairwise Meta-Analysis.
2025
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M, K., S, F., R, J., SK, R., ME, S., Z, A. B., ML, F., F, D., & A, B. (2025). Effects of Whey Protein Supplementation on Body Composition, Muscular Strength, and Cardiometabolic Health in Older Adults: A Systematic Review with Pairwise Meta-Analysis.. doi.org. https://doi.org/10.3390/healthcare13212814

Evidence against · 4
The effects of whey protein supplementation on indices of cardiometabolic health: A systematic review and meta-analysis of randomized controlled trials.
2025
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K, P., PT, M., N, V., J, M., KK, T., KS, K., J, R., C, H., E, S., D, V., & OC, W. (2025). The effects of whey protein supplementation on indices of cardiometabolic health: A systematic review and meta-analysis of randomized controlled trials.. doi.org. https://doi.org/10.1016/j.clnu.2024.12.003

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More for · 1
Effects of nutritional supplementation on glucose metabolism and insulin function among people with HIV initiating ART
2021
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Amare, H., Olsen, M. F., Friis, H., Kæstel, P., Andersen, Å. B., & Abdissa, A. (2021). Effects of nutritional supplementation on glucose metabolism and insulin function among people with HIV initiating ART. doi.org. https://doi.org/10.1186/s40795-021-00462-y

More against · 3
Effect of resistance training combined with carbohydrate and protein supplementation on the HOMA-IR, glycemic, lipid profile and hypertrophy of older adults with Type II Diabetes: secondary data analysis of a triple-blind RCT.
2026
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JL, R., MH, D. S. L., MV, G., AMS, d. L., JR, D. S., VC, d. S., JMD, G., FS, C., GE, F., & AC, A. (2026). Effect of resistance training combined with carbohydrate and protein supplementation on the HOMA-IR, glycemic, lipid profile and hypertrophy of older adults with Type II Diabetes: secondary data analysis of a triple-blind RCT.. doi.org. https://doi.org/10.1007/s40520-026-03374-8

Changes to insulin sensitivity in glucose clearance systems and redox following dietary supplementation with a novel cysteine-rich protein: A pilot randomized controlled trial in humans with type-2 diabetes
2023
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Peeters, W., Gram, M., Dias, G., Vissers, M., Hampton, M., & Dickerhof, N. (2023). Changes to insulin sensitivity in glucose clearance systems and redox following dietary supplementation with a novel cysteine-rich protein: A pilot randomized controlled trial in humans with type-2 diabetes. doi.org. https://doi.org/10.1016/j.redox.2023.102918

Benefits of Whey Proteins on Type 2 Diabetes Mellitus Parameters and Prevention of Cardiovascular Diseases -
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Benefits of Whey Proteins on Type 2 Diabetes Mellitus Parameters and Prevention of Cardiovascular Diseases - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.3390/nu15051294

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