After consuming whey peptide, women experience a measurable rise in blood insulin levels within an hour, while men do not show this response.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether whey peptide consistently induces greater insulin secretion in women than men across different doses and metabolic conditions.
A systematic review and meta-analysis of all RCTs comparing insulin response to whey peptide ingestion in men and women, stratified by dose, age, BMI, and menstrual phase, with standardized glucose and insulin assays.
Whether whey peptide causes a greater insulin response in women than men under controlled metabolic conditions.
A double-blind RCT with 40 healthy adults (20 male, 20 female) matched for BMI and fasting glucose, randomized to receive 20g whey peptide or placebo on separate days, with blood samples collected at 0, 15, 30, 60, and 120 minutes to measure serum insulin.
Whether women who regularly consume whey peptide develop a sustained insulin response compared to men over time.
A 12-week prospective cohort study of 50 men and 50 women consuming 20g whey peptide daily after breakfast, with fasting and post-ingestion insulin levels measured at baseline, week 4, and week 12.
Whether habitual whey peptide consumers show sex differences in post-ingestion insulin response.
A cross-sectional analysis comparing post-whey peptide insulin response in 30 men and 30 women who consume whey peptide ≥3x/week for ≥6 months, with standardized 20g dose and 60-minute post-ingestion blood draw.
Whether a single 20g whey peptide dose increases insulin in healthy young women but not men.
A case series of 10 healthy young adults (5 male, 5 female) consuming 20g whey peptide after 12-hour fast, with serum insulin measured at baseline and 60 minutes post-ingestion.