Build Muscle: Train First, Then Feed It
Stuart Phillips debunks the biggest muscle myth: protein alone doesn't build muscle, resistance training is the trigger that makes it grow. In his brick-wall picture, training builds and protein is just the bricks; without lifting 2 to 4 times a week, extra protein piles up unused, which matters most as you age and need to protect strength and independence.
The biggest myth Phillips pushes back on is that eating more protein builds muscle. It does not, on its own. Resistance training is the trigger that actually tells your body to build muscle, and protein is the raw material it uses once that switch is flipped. He uses a simple picture: your muscle is like a brick wall, training does the building, and protein is the bricks. Without the training, extra bricks just pile up unused. This matters most as you age, when keeping muscle protects your strength, independence and health.
Why it works▼
Do resistance training, no exceptions
Training is the actual trigger for building muscle. Nothing you eat replaces it.
Gradually make it harder
Muscle grows in response to a rising challenge, not the same easy routine.
Have enough protein around your training
Once training flips the switch, protein is the material your body uses to rebuild.
Keep training as you get older
Muscle loss speeds up with age, and resistance training is the proven way to slow or reverse it.
Do not rely on supplements to do the work
Phillips is clear that supplements are optional convenience, not the cause of results.
- Anyone who wants to build or keep muscle
- People who have been told protein alone will do it
- Older adults protecting strength and independence
- General education based on Phillips' work, not a personal training or medical plan.
- If you are new to intense exercise or have a health condition, get cleared by your doctor first.
- Learn good form and build up gradually to avoid injury.
- No products are sold here.
- July 3, 2026 Protocol published.
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Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol.ai is an independent platform. This protocol is based on the publicly available work of Stuart Phillips and is not created, reviewed, endorsed by, or affiliated with Stuart Phillips or McMaster University.