Over five weeks, overweight men who eat less protein and more carbohydrates without cutting calories show no meaningful change in their fasting blood sugar, insulin levels, insulin resistance, or overall amino acid levels in the blood.
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 protein reduction at 0.9 g/kg/day consistently has no effect on fasting glucose, insulin, or insulin resistance across diverse populations with overweight or obesity.
A systematic review and meta-analysis of all RCTs measuring fasting glucose, insulin, and HOMA-IR in response to protein reduction (0.8–1.0 g/kg/day) with increased carbohydrates in adults with BMI ≥26 kg/m², comparing outcomes across studies with standardized protocols.
Whether this specific protein reduction strategy has no effect on fasting glucose, insulin, or insulin resistance in men with overweight or obesity.
A double-blind RCT with 100 men aged 30–50, BMI 27–34 kg/m², randomized to 0.9 g/kg/day protein + 52% carbs or 1.8 g/kg/day protein + 43% carbs for 8 weeks, with fasting glucose, insulin, and HOMA-IR measured weekly and hyperinsulinemic-euglycemic clamp performed at baseline and endpoint.
Whether men who habitually consume lower protein diets have similar fasting glucose and insulin profiles compared to those consuming higher protein diets.
A prospective cohort study following 400 men aged 25–50 with BMI 26–35 kg/m² for 12 months, measuring habitual protein intake via food records and fasting glucose, insulin, and HOMA-IR every 3 months.
Whether men with lower habitual protein intake have similar fasting glucose, insulin, and HOMA-IR compared to those with higher intake.
A cross-sectional analysis of 600 men aged 25–50 with BMI 26–35 kg/m², measuring habitual protein intake via 7-day food records and fasting glucose, insulin, and HOMA-IR levels.
Whether rare individuals experience unexpected changes in glucose or insulin metabolism during protein reduction.
A case series of 10 men with overweight or obesity who, despite consuming 0.9 g/kg/day protein, show unexpected worsening or improvement in fasting glucose or insulin levels, with detailed metabolic phenotyping.