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Protein Plus Resistance Training Adds 2.63 kg Bench and 7.40 kg Squat Strength in Young AdultsAdding protein to weight training helps young adults build strength

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Key Takeaway
Consider protein plus resistance training for strength gains, but benefits depend on duration, timing, and baseline status.

This meta-analysis synthesized data from randomized controlled trials to evaluate whether adding protein supplementation to resistance training improves muscle strength gains in healthy young adults compared with resistance training alone. The analysis included 611 participants. The primary outcome was muscle strength gains, with bench press and squat strength as secondary outcomes.

Pooled results showed significant improvements favoring combined resistance training and protein supplementation. Bench press strength increased by a weighted mean difference of 2.63 kg (95% CI 0.77 to 4.49; p = 0.006). Squat strength increased by a weighted mean difference of 7.40 kg (95% CI 2.15 to 12.66; p = 0.006).

The authors note that the incremental benefit of protein supplementation appears conditional on several factors: intervention duration, protein timing, training background, and baseline protein status. Heterogeneity in these variables was listed as a limitation. Follow-up duration, adverse events, discontinuations, tolerability, funding, and conflicts of interest were not reported.

Practice relevance: protein supplementation combined with resistance training may enhance muscle strength in young healthy adults, but the added benefit is not universal and depends on the factors above. Clinicians should interpret these findings with caution given the heterogeneity and missing safety data.

If you are a young adult looking to get stronger, the way you fuel your workouts matters. New data shows that combining resistance training with protein supplements can lead to better results than lifting weights alone. Specifically, those who took protein while training saw significant improvements in their bench press and squat strength.

Researchers looked at data from 611 healthy young adults to see how these two methods compared. The results showed that adding protein helped people lift more weight in both the bench press and the squat. While the results are promising, the researchers noted that these gains might depend on several factors, such as how long the program lasted and when the protein was taken.

It is important to remember that everyone starts from a different place. Factors like your current fitness level and your starting protein status could change how much of a boost you get. Because the study included many different types of training backgrounds, the exact benefit for any one person might vary.

What this means for you:
Adding protein to resistance training can increase muscle strength in young adults, but results may vary based on individual factors.

Common questions

Does adding protein make a difference in strength?

Yes, the data shows that combining resistance training with protein supplementation leads to significant improvements in muscle strength compared to training alone. This was specifically seen in both bench press and squat strength for the group of 611 healthy young adults studied.

Who is this finding most helpful for?

This finding specifically applies to healthy young adults. The study looked at how these individuals responded to adding protein to their existing resistance training routines to see if it helped them lift more weight.

Are there any reasons the results might vary for me?

The benefits of adding protein may depend on several factors, including how long the training lasted, the timing of the protein intake, your personal training background, and your baseline protein status.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedOct 2026
View Original Abstract ↓
BackgroundThis study aimed to determine whether protein supplementation confers additional benefits for muscle strength gains beyond those induced by resistance training (RT) alone in healthy young adults.MethodsA systematic literature search was performed in PubMed, Web of Science, Cochrane Library, and SPORTDiscus through April 1, 2026. Twenty-three randomized controlled trials involving 611 healthy young adults were included. Pooled estimates were calculated as weighted mean differences (WMD) with 95% confidence intervals (CIs) using a random-effects model. Subgroup analysis, meta-regression, and leave-one-out and leave-one-category-out sensitivity analysis were performed to explore heterogeneity.ResultsCompared with RT alone, combined RT and protein supplementation produced significant improvements in both bench press (WMD: 2.63 kg, 95% CI: 0.77–4.49, p = 0.006) and squat strength (WMD: 7.40 kg, 95% CI: 2.15–12.66, p = 0.006). Subgroup analysis revealed that the ergogenic effect on squat strength was predominantly observed when the intervention lasted ≤12 weeks, or when protein was ingested both around exercise (pre- and/or post-exercise) and before sleep. Meta-regression identified intervention duration as a significant moderator (p = 0.037) and protein timing as a borderline moderator (p = 0.073) of squat strength heterogeneity. Sensitivity analysis showed that the pooled effects remained significant and consistent in direction.ConclusionProtein supplementation combined with resistance training enhances muscle strength in young healthy adults, but its incremental benefit appears conditional on intervention duration, nutrient timing, training background, and baseline protein status rather than universally applicable. Future well-powered trials with standardized protein dose and source reporting, repeated measures of habitual protein intake, and stratified designs are needed to clarify these interactions and support more personalized, mechanism-informed exercise and nutrition guidance.Systematic review registrationhttps://www.crd.york.ac.uk/PROSPERO/# myprospero, PROSPERO, identifier: CRD42024534481.
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