Ask ten people in the gym how much protein you need and you'll get ten different answers — anywhere from "just eat balanced meals" to numbers that would have you drinking shakes around the clock. Protein might be the most argued-about topic in nutrition, which is strange, because the actual research on this is fairly settled.
Here's what the evidence actually says, and how to apply it without overcomplicating your life.
Why Protein Gets Special Treatment
Protein isn't just "a food group" — it's the raw material your body uses to repair and build muscle tissue, produce enzymes and hormones, support your immune system, and keep you full and satisfied between meals. Carbs and fats matter too, but only protein directly supplies the amino acids your muscles need to recover and grow from training.
This is why protein needs get talked about separately from "just eat healthy" advice — the amount you eat has a direct, measurable effect on how your body responds to training.
What the Research Actually Says
The old general population guidelines — roughly 0.8g per kg of bodyweight — were designed to prevent deficiency in a sedentary population, not to optimise muscle building or support people training regularly. If you're active, that number is too low.
For people strength training regularly, most research points to a range of roughly 1.6 to 2.2g per kg of bodyweight per day as the sweet spot for maximising muscle growth and recovery. Eating more than that doesn't appear to provide much additional benefit for most people — protein isn't a "more is always better" nutrient once you're within that range.
If you're in a calorie deficit trying to lose fat while preserving muscle, the upper end of that range (or even slightly beyond it) becomes more useful — protein plays an outsized role in protecting muscle tissue when your total calories are restricted.
What This Looks Like in Real Numbers
For a general sense of scale: someone who weighs 80kg training regularly would typically be looking at roughly 130-175g of protein per day to sit comfortably in that effective range. Someone who weighs 60kg would be looking at roughly 95-130g per day.
These aren't hard targets you need to hit to the gram — they're a useful zone to aim for consistently, not a number to stress over if you're 10g under on a given day.
Do You Need to Eat It All at Once? Or Constantly?
Neither. The old idea that you can only absorb a small, fixed amount of protein per meal and the rest "goes to waste" doesn't hold up well under modern research — your body is considerably more flexible with protein timing than that.
That said, spreading your protein across 3-4 meals a day, rather than eating almost none until one huge meal at night, does appear to support muscle building slightly better — mostly because it keeps your amino acid levels more consistently available across the day for your body to use.
Does It Matter Where the Protein Comes From?
Mostly, no — but not entirely. Animal proteins (meat, fish, eggs, dairy) are generally "complete," containing all the essential amino acids your body needs in reasonably good proportions. Plant proteins can absolutely get you there too, but often require a bit more variety and slightly higher total intake to cover the same ground, since individual plant sources tend to be lower in one or more essential amino acids.
If you're eating a varied diet with a mix of protein sources, this becomes a non-issue in practice.
Common Mistakes People Make
Underestimating portion sizes. A "chicken breast" people picture in their head is often smaller than what actually ends up on the plate — and vice versa. If you're unsure, weighing your food for a couple of weeks (even loosely) tends to be an eye-opening exercise.
Relying on breakfast and lunch being protein-light, then trying to fix it all at dinner. This makes hitting your daily target far harder than it needs to be. Front-loading a bit more protein earlier in the day makes the whole day easier to manage.
Assuming supplements are required. Protein powder is a convenient tool, not a necessity. If whole food gets you to your target, that's just as effective. Shakes exist to fill gaps, not to replace real food as a primary strategy.
The Bottom Line
For most people training regularly, somewhere around 1.6-2.2g of protein per kg of bodyweight per day is the evidence-backed sweet spot — higher if you're actively trying to preserve muscle in a fat loss phase. Spread it across your meals, don't stress about hitting it perfectly every single day, and treat it as one of the highest-leverage habits you can build alongside your training.
Everything else in nutrition is negotiable to some degree. Protein, if you're serious about your results, really isn't.
Written by
Wolverine PT
Coaching adults who want to build muscle, get stronger and stay capable while balancing work, family and normal life.
