Protein timing — does the anabolic window actually matter?

I've seen conflicting information about the post-workout "anabolic window." Some sources say you need protein within 30 minutes of training, others say it doesn't matter as long as your daily intake is sufficient.

Currently I'm doing:

• Pre-ride: nothing (train fasted, usually morning rides)
• Post-ride: protein shake within 15 min
• Daily protein: ~1.8g/kg (140g at 78kg)

Am I overthinking this? Should I just focus on daily totals?

The science on this has evolved a lot. The short answer: daily totals matter more than timing, but timing isn't irrelevant.

The "anabolic window" isn't 30 minutes — it's more like 3-4 hours. And it extends further if you had a pre-workout meal. So if you ate breakfast at 7am and train at 8am, you have until roughly noon before timing becomes a concern.

However: Since you train fasted, the post-workout meal matters MORE for you than for someone who ate beforehand. Your muscle protein synthesis response is elevated but you have no circulating amino acids to take advantage of it.

My recommendation:

1. Either eat something before training (even just a banana + whey), OR
2. Prioritize getting 30-40g protein within 1-2 hours post-workout

Your 1.8g/kg daily is excellent for an endurance athlete. That's the biggest lever — nail that consistently and don't stress about exact timing.

I'd push back slightly on fasted training for hard sessions. There's emerging research showing that training fasted for intense efforts (threshold, VO2max) actually impairs the quality of the workout without meaningful fat adaptation benefits.

Fasted training is fine for:

• Easy Z2 rides under 90 min
• Recovery rides

You should fuel for:

• Any interval session
• Rides over 90 min
• Key long rides

The protein timing thing is a rounding error compared to just making sure you can actually complete your hard workouts at the prescribed intensity.