Training creates the signal for muscle to grow. Nutrition is what actually builds it. Someone training seven days a week with double sessions and eating like an afterthought will out-train their own recovery — the workouts are fine, the fuel isn't there to use them.

Protein: the non-negotiable

Muscle tissue is rebuilt from protein. If you're not eating enough of it, your body doesn't have the raw material to repair and grow the fibers you just broke down in training, no matter how good the session was.

A commonly used range for people training seriously is roughly 1.6–2.2g of protein per kilogram of bodyweight per day. That's a wide range on purpose — where you sit in it depends on training volume and how lean you are, and it's worth adjusting based on how you're actually recovering rather than chasing an exact number.

Spreading protein across the day (rather than one huge dinner) appears to help your body use it more effectively, since muscle rebuilding happens continuously, not just at one mealtime.

Calories: the part people undertrain

Protein gets all the attention, but if total calories are too low, your body will still struggle to build muscle even with plenty of protein coming in — it prioritizes keeping you alive and functioning over building new tissue. Training seven days a week with occasional doubles burns through a serious amount of energy. Chronic undereating on that schedule shows up as stalled lifts, nagging fatigue, and getting sick more often than usual.

This doesn't mean eating without limits. It means matching your intake to what your training actually demands, rather than treating "eating a lot" and "eating well" as opposites.

Carbohydrates aren't the enemy

For someone training at real volume, carbohydrates are what keep your training sessions from falling apart halfway through — they're the primary fuel for high-intensity efforts like a hard metcon or a heavy lifting session. Cutting carbs hard while training this often tends to show up first as performance dropping in session, before it shows up anywhere else.

Timing matters less than total intake

There's a lot of noise about the "anabolic window" — the idea that you must eat protein within some narrow time after training or the session is wasted. In practice, total daily protein and calorie intake matters far more than hitting a precise window. Eating reasonably within a few hours of training is sensible; treating it as a hard deadline isn't necessary.

Sleep is part of nutrition, functionally

It's not food, but it belongs in this conversation: most of the actual repair and growth work happens during sleep. Undersleeping on a high-volume training schedule blunts recovery in a way that no amount of correct eating fully compensates for.

Practical takeaways

  • Prioritize hitting a consistent protein target every day over any other single nutrition rule.
  • Don't undereat total calories on a high-frequency training schedule — that's the fastest way to stall progress despite training hard.
  • Keep carbohydrates in the picture if your sessions include high-intensity conditioning; performance drop-off is often the first sign they're too low.
  • Treat sleep as part of the recovery plan, not a separate issue from nutrition.