Protein maxing is half right. The research is clear that most people, especially women who train, eat less protein than they should. It is equally clear that the benefit for building muscle flattens out around 1.6 grams per kilogram of body weight. Below that line, more protein helps. Above it, you are mostly buying insurance your muscle does not cash.
What does the research actually say about protein and muscle?
The single most useful number comes from a 2018 meta-analysis that pooled 49 studies and nearly 1,900 people doing resistance training. When the researchers plotted protein intake against muscle gains, the line climbed and then went flat. The break point sat at about 1.62 grams per kilogram per day (Morton et al., PubMed). Past that, adding protein did not add fat-free mass.
Read that carefully, because it cuts both ways. If you are eating 1.0 g/kg and wondering why your training is not showing up in the mirror, this study says eat more. That is real, and it is the part the trend gets right. But if you are already at 1.8 and grinding toward 3.0 because a video told you muscle scales with grams forever, this study says you are chasing a benefit that has already topped out.
There is a sensible margin worth noting. That 1.62 figure had a confidence range stretching up past 2.0, and individual variation is real, so aiming for roughly 1.6 to 2.0 g/kg gives you headroom without wandering into fantasy territory. That is the honest read of the data, not a round number someone picked because it sounded strong.
Is protein maxing a scam or is it onto something?
It is onto something, then it overshoots. The trend deserves credit for dragging protein back into the conversation for women who spent years being told to eat less of everything. The average protein intake for women in this age bracket is genuinely low, and correcting that changes how training feels and how muscle holds. Good.
Where it goes sideways is the implied promise that if 1.6 is good, 3.0 is nearly double good. Bodies do not work like a loyalty card. The muscle-building signal saturates. Once the machinery is fully switched on, extra protein gets used for other things or burned for energy, which is fine, but it is not building the biceps the caption promised. You are paying protein prices for a general-purpose calorie.
The other quiet cost is crowding. When protein has to be enormous, it pushes out produce, fiber, and the boring stuff that makes eating sustainable. A plan you can hold for a decade beats a plan you can hold for a fired-up March. If you want to see how a target gets set from your training instead of a trend, the app does exactly that, and our comparison with MyFitnessPal covers why a target you understand beats a database you fight.
Why does spreading protein through the day matter?
Total grams get all the attention, but distribution is the underrated half of the story. The evidence points toward hitting a solid dose of protein at each of three or four meals rather than backloading the whole day into dinner. The muscle-building response seems to fire best when you give it a real serving repeatedly, not one giant deposit.
In practice this is simple. Land 30 to 40 grams at breakfast, lunch, and dinner, and you have covered a large woman’s daily need without a fourth of the day doing nothing. The reason breakfast matters so much is that most people’s is a protein desert. Coffee is not a meal. Fix breakfast and you often fix your whole daily number without touching the rest.
None of this requires a food scale or a barcode gun. If precise weighing already made tracking feel like a second job, our guide to tracking without weighing walks through the looser approach, and you can check the FAQ for how close the estimates land.
The honest summary
Eat more protein than you probably do. Aim for something in the 1.6 to 2.0 g/kg range. Spread it across your meals so no part of the day is wasted. And then stop, because the graph goes flat and your money and your appetite have better uses than the grams past the plateau.
Protein maxing got you to pay attention, which was the hard part. The research just draws the line where paying attention turns into paying for nothing. Stay on the useful side of it and let the training do the rest.
Download TrakMac
TrakMac builds your protein target from how you train, makes it the floor of your day, and lets you log by talking instead of typing. Say what you ate, confirm the estimate, done. It lands within about ten percent on common meals, close enough to hit a target you can actually keep.
Download TrakMac free. iOS, free to download.