The Protein Timing Myth: Why You Don't Need 5 Meals a Day to Build Muscle After 40
I used to say it with total confidence. I would look a client dead in the eye and tell them:
"If you eat more than 40 grams of protein in a meal, your body can't use it all. You'll pee it out or something."
And I believed it! Other coaches said the same thing.
The research backed it up. Or at least, that's what we all thought it showed. For decades, the playbook was clear: spread your protein across 3-5 meals, cap each one at 25-40 grams, and anything beyond that in a single sitting wasn't used for muscle building.
So you'd meal prep, stick to a set schedule, and stress about hitting your protein window at lunch between back-to-back meetings. One more thing to manage in an already overloaded day.
Turns out, we were WRONG.
How Much Protein Can Your Body Actually Absorb? (More Than We Thought)
In December 2023, researchers at Maastricht University published a study in Cell Reports Medicine that flipped the script on per-meal protein limits.
This wasn't some rinky-dink study with twelve college kids and a bowl of whey powder. They used a quadruple isotope tracer approach (way fancier method than what previous researchers used) and compared what happened when subjects consumed either 25 grams or 100 grams of protein after resistance exercise. The kicker: most earlier studies only measured the anabolic response for about four to six hours.
These researchers tracked it for twelve!
At the four-hour mark, the 100-gram group was still going. Still digesting, still absorbing, still incorporating amino acids into muscle tissue. The response didn't plateau and it didn't shut off — it kept climbing for over 12 hours, building more muscle protein, more connective tissue protein, and producing a greater whole-body net protein balance than anyone had previously measured.
The researchers' conclusion? The anabolic (i.e. muscle building) response to protein ingestion has no apparent upper limit in magnitude or duration.
What the Anabolic Window Myth Means For Your Life
You don't need to eat five meals a day to maximize muscle protein synthesis. Two or three bigger meals with 50-70 grams of protein each? Your body will use it. A big steak dinner where you crush 80 grams? Not wasted. That post-workout shake you've been stressing about timing within 30 minutes of your last set? Way less critical than your total protein intake across the entire day.
The constraint you've been engineering your entire schedule around was never real!
If you're wondering how much protein per meal you should aim for now - really, don't overthink it. I've written extensively about why protein is the most important macronutrient for staying lean and strong, and the bottom line hasn't changed: get enough total protein each day. For most people, this between .7-1g per pound of bodyweight. How you split it up is your call.
One Less Thing To Stress About
I work with a lot of people who are doing everything right on paper. Tracking macros, wearing an Oura ring, getting bloodwork done, optimizing their supplements, and love love love Andrew Huberman even if his podcasts are 3+ hours of boring nuance. They are NOT uninformed. If anything, they have the opposite problem — they're drowning in variables and rules, many of which are based on research that's already been revised.
Protein timing was one of those rules.
It felt important and gave you something to optimize. And for years, it turned eating into a logistical project. Portioning out chicken breast into perfectly measured containers, cramming in a fourth meal you didn't want because you thought three wasn't enough.
All that friction, and it turned out not to matter.
Your total daily protein intake is what drives the result. How you distribute it across the day? Preference. For a busy person managing a career, a family, and their own health, having one less rule to follow is a huge win.
Take it, eat your protein whenever (and wherever and with whomever) you'd like, and get after it.
Best,
John
P.S. Need help figuring out what to eat? Here are 20 high protein breakfasts for busy mornings and the 15 foods I eat every day to stay lean and build muscle.
P.P.S. How can you beat salmon and March Madness? And puppy got an Easter highland cow.
FAQ
How much protein can your body absorb in one meal? Based on the 2023 Trommelen study, there's no practical upper limit. Your body will continue digesting and utilizing protein for up to 12 hours after a large dose. Most people find two to three protein-rich meals per day is the sweet spot from a "this is realistic and I feel good" standpoint.
Does protein timing after a workout still matter? For muscle building, total daily protein is the main driver. Eating protein within a few hours of training is still a good idea — not because there's a magic 30-minute anabolic window, but because post-exercise is when your muscles are primed to use those amino acids. If you train at 6am and don't eat until 8am, you'll be fine.
How much protein should I eat per day to build muscle? The research consistently supports roughly 0.7-1 gram per pound of body weight if you strength train. If you weigh 180 pounds, that's 130-180 grams per day. Hit the floor of that range consistently and you're doing better than most. I've written a deeper dive on this here. If you need practical ideas for hitting your number, this article on how to eat more protein is a great place to start.
Was the old advice about 25-40g of protein per meal completely wrong? Not wrong — incomplete. Earlier studies measured muscle protein synthesis over short windows (4-6 hours) and saw it plateau around 25-40 grams. What they missed was that the body continues processing and utilizing protein well beyond that initial window, especially with larger doses. The science evolved. That's a good thing.
3 Steps You Can Take
Apply for coaching - If you’re ready to start, you can fill out a coaching application here (it takes 90 seconds or less). Best case, you change your life. Worst case, I’ll help you draw up a road map to get closer to your goals.
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Keep learning - You can check out my other articles here. Nobody asked me to, but I’ve spent a ton of time researching everything from artificial sweeteners to saturated fat to testosterone and more, so you don’t have to.
