For older guys in their 60s and 70s who already eat enough protein, taking 40 grams of protein right after working out or just before bed doesn’t help build bigger leg muscles any more than just working out — the muscle gains are about the same no matter when they take it.
See the scientific wording
In untrained older men aged 60–75 years with baseline protein intake ≥1.0 g/kg/day, consuming 40 g of protein either immediately after resistance exercise or 30 minutes before sleep does not enhance gains in quadriceps muscle thickness over 12 weeks of twice-weekly resistance training, compared to resistance training alone. Muscle thickness increased by approximately 0.16–0.18 cm across all groups, with no significant differences between timing strategies or versus no supplementation, indicating that protein timing is not a critical factor for hypertrophy when daily protein needs are met.
Very strong evidence
Randomized trialsOne good-quality study supports this claim.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2025
The study found that taking protein right after workouts or before bed didn’t help older men gain more muscle compared to just doing the workouts, as long as they were already eating enough protein overall.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
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Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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For older guys in their 60s and 70s who already eat enough protein, taking 40 grams of protein right after working out or just before bed doesn’t help build bigger leg muscles any more than just working out — the muscle gains are about the same no matter when they take it.
Evidence from Studies
Supporting (1)
Community contributions welcome
Neither pre-sleep nor post-exercise protein consumption influences resistance exercise training adaptations in older adults
The study found that taking protein right after workouts or before bed didn’t help older men gain more muscle compared to just doing the workouts, as long as they were already eating enough protein overall.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
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.
Systematic Review and Meta-Analysis of Protein Timing on Muscle Hypertrophy in Older Adults with Adequate Daily Protein Intake
Systematic review of randomized controlled trials assessing protein timing (post-exercise or pre-sleep) vs. no supplementation in untrained men 60–75 years old with baseline protein ≥1.0 g/kg/day, measuring quadriceps muscle thickness after ≥12 weeks of resistance training.
Double-Blind RCT of Post-Exercise vs. Pre-Sleep Protein Timing on Muscle Growth in Older Men with Sufficient Protein Intake
Double-blind, placebo-controlled randomized trial assigning untrained men 60–75 years with protein intake ≥1.0 g/kg/day to receive 40 g protein post-exercise, pre-sleep, or no supplement, all undergoing 12 weeks of twice-weekly resistance training, with ultrasound-measured quadriceps muscle thickness as primary outcome.
Prospective Cohort Study of Protein Timing Practices and Muscle Mass Changes in Community-Dwelling Older Men
Prospective cohort of untrained men aged 60–75 with baseline protein ≥1.0 g/kg/day, tracking self-reported protein timing and resistance training frequency over 12 weeks, with serial ultrasound measurements of quadriceps thickness.
Cross-Sectional Analysis of Protein Timing and Quadriceps Muscle Thickness in Older Men Engaged in Resistance Training
Cross-sectional study measuring current protein supplementation timing (post-exercise, pre-sleep, none) and quadriceps muscle thickness via ultrasound in untrained men 60–75 years old with protein intake ≥1.0 g/kg/day and at least 6 weeks of resistance training.
Case Report of Muscle Thickness Response to Altered Protein Timing in an Older Man with High Baseline Protein Intake
Single-case report of an untrained man aged 60–75 with baseline protein intake ≥1.0 g/kg/day undergoing 12 weeks of resistance training, documenting changes in quadriceps thickness before and after implementing post-exercise or pre-sleep protein supplementation.