Walk into any gym and you'll find someone defending high-protein-low-carb against someone defending carb-loading. Both are partially right. Both are missing the point.

Muscle building isn't a macro showdown. Protein and carbs do completely different jobs — and your body needs both to actually grow.

Protein's Job

The building blocks.

Protein supplies amino acids — the raw material your body uses to repair and build muscle tissue. The process is called muscle protein synthesis (MPS), and it's what turns hard training into actual muscle gain.

Without enough protein, you can train your hardest and you still won't build. The signal is there. The materials aren't. Protein is the muscle-specific nutrient. You can't make muscle without it.

The number

0.7-1g of protein per pound of bodyweight, every day. For most people that lands between 120 and 200g daily. Spread it across the day — your body uses it best when it's not all in one meal.

Carbs' Job

The training fuel — and the recovery.

Carbs don't go directly into muscle the way protein does. But the workout that builds muscle? That's powered by carbs. Glycogen — stored carbohydrate in your muscles and liver — is the fuel for every heavy set, every sprint interval, every metcon.

Run low and intensity drops. Drop intensity and the stimulus that triggers growth drops with it. Carbs support the training that drives muscle growth — and the metabolic environment that lets it happen.

When they matter most

Around training. The 1-2 hours before a hard session, and during sessions that run past 60-90 minutes. That's where carbs earn their keep — fueling the work, sparing protein from being burned for energy, refilling glycogen for the next session.

The Honest Framing

Protein is the muscle-specific nutrient — you literally can't build without it. Carbs support the training that drives growth and the metabolic environment that allows it. Different roles, not competing. Skip either one and the math doesn't work.

Built For The Training Fuel