Does more protein always mean more muscle? Lore vs research
Published: 2026-06-24
Written by: Hirotsugu YoshimuraReviewed by: Tomonobu Someda
'In a bulk, just eat tons of protein — the more you take, the more muscle you build.' We test this gym staple against the research on dose–response, the role of training, and age.
Let the data settle it.
Does more protein keep building more muscle?
What's said
ボディビル界の通説
In a bulk you down protein by the bucket — the more the better for hypertrophy.
What research says
- A meta-analysis of over 1,800 people found that gains in muscle and strength largely plateau around 1.6 g/kg/day of total protein.
- Beyond that, extra intake adds very little.
'More is better' is wrong. It isn't harmful for healthy people, but aiming around 1.6 g/kg/day is the cost-effective target.
Will protein build muscle without training?
What's said
一般的な通説
As long as you drink protein, muscle will come.
What research says
- What the meta-analysis shows is that protein augments the muscle and strength gains driven by resistance training.
- The supplement works because the training stimulus is there.
Training is the driver; protein is the support. Drinking it alone won't add muscle.
Is the requirement the same for everyone?
What's said
一般的な通説
Protein needs are the same regardless of age.
What research says
- The meta-analysis suggests that older adults tend to need more protein to get the same response (age-related anabolic resistance).
Younger people are often well served around 1.6 g/kg/day, while older adults may reasonably aim a bit higher.
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Published: 2026-06-24
Written by
Hirotsugu YoshimuraFounder of BODYDATA / CEO of INVOLVE
I don't pick things because they "seem good." I check the data first, then test it with my own body.
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Reviewed by: Tomonobu Someda
Content reviewed from the perspective of coaching practice and supplement-industry experience