Research
Hormonal
Whey protein supplements do not consistently provide superior body composition or strength benefits compared to whole milk or milk powder, and may carry risks of insulin resistance due to high branched-chain amino acid content.
You likely do not need expensive whey protein powder to build muscle. Whole milk or milk powder provide similar muscle-building benefits at a much lower cost and with additional nutritional advantages.
ModerateRefutesMEDIUM confidence
Given these factors, along with the high level of processing, limited evidence of superior effects, and potential links with insulin resistance, whey supplementation may represent a costly alternative to whole milk or milk powder, which offer similar physiological benefits at lower cost.
Why this rating
Based on narrative review of RCTs with high heterogeneity.
Source
Exploring the dairy milk matrix beyond isolated nutrients—a narrative review
Therese A. O’Sullivan et al. · Critical Reviews in Food Science and Nutrition · 2026
DOI 10.1080/10408398.2026.2648097
narrative_review
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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