Protein is the one area of sports nutrition where the research has actually settled down. The problem is that the settled answers are boring, so the loud advice has drifted a long way from them.
The daily total is what matters most
If you are training with weights and want to build or keep muscle, the evidence points to somewhere around 1.6 grams of protein per kilogram of bodyweight per day as the point where additional protein stops making much measurable difference. A widely cited 2018 meta-analysis of resistance training studies found gains largely plateaued around that figure, with the upper end of the plausible range extending to roughly 2.2 g/kg.
For an 80 kg person, that is about 128 g a day, up to around 175 g at the high end. If you are in a calorie deficit and trying to hold onto muscle while losing fat, aiming nearer the top of that range is sensible, because protein needs go up when energy intake goes down.
Two things follow from this that people find annoying:
- If you are under that figure, fixing your daily total will do more for you than any supplement, timing strategy or product on any shelf.
- If you are comfortably over it, adding more is not doing much. Very high intakes are not dangerous for healthy people, they are just not buying you anything.
The anabolic window is much wider than you were told
The idea that you must get protein in within thirty minutes of finishing a session has not held up well. Reviews of the evidence suggest the window in which post-training protein is useful is measured in hours, not minutes — and that once total daily intake is accounted for, precise timing adds little.
The nuance worth keeping: if you train fasted, or several hours after your last meal, getting protein in reasonably soon afterwards is a genuinely good idea. If you had a proper meal two hours before training, sprinting to a shaker the second you rack the bar is not doing much.
Spreading it out does seem to help a bit
This is where timing does earn some attention, just not the way it is usually framed. Rather than one enormous protein hit, the evidence mildly favours spreading intake across three to five meals, each containing a decent dose — somewhere around 0.4 g/kg per meal, so roughly 30 g for most people, more for larger individuals.
Four meals of 35 g beats one of 140 g, but not by a dramatic margin. Hit the daily total first, then tidy up the distribution.
Do you need a protein powder?
No. You need protein. Powder is one convenient, fairly cheap way of getting some of it.
Chicken, eggs, fish, dairy, lean beef, tofu, tempeh, lentils and beans all count. A pint of milk is about 20 g. Greek yoghurt, cottage cheese and tinned fish are all extremely efficient. If you can hit your number with food you enjoy, you do not need to buy anything.
Where powder genuinely helps is the practical problem: hitting 130 g or more a day from whole food takes planning and appetite, and a lot of people run out of one or both. A scoop after training or with breakfast closes a gap that would otherwise stay open. That is the whole case for it — convenience, not magic.
A few points worth knowing if you do buy some:
- Whey concentrate is the cheapest per gram of protein and is fine for almost everyone. Isolate is more filtered, lower in lactose, and more expensive — worth it mainly if concentrate upsets your stomach.
- Plant blends (usually pea and rice together) close the amino acid gap that either one alone leaves. A single-source pea protein is less complete.
- Casein digests slowly. The evidence that this matters much is thin, but it makes a filling late-evening option.
- Check price per 100 g of protein, not price per tub. The difference between brands is often mostly flavouring and marketing.
Lumps are the main reason people give up on powder, and they are almost entirely a mixing problem rather than a product problem. Liquid in first, powder second, and a decent mixing ball rather than a stir with a spoon — our Steel Shaker Bottle is built around that, and unlike plastic it does not hold onto the smell of yesterday's shake.
What about everything else on the shelf?
Briefly, and honestly: creatine monohydrate is the one other supplement with a genuinely strong evidence base for strength and muscle, it is cheap, and the plain monohydrate form is as good as the expensive versions. Caffeine works as a performance aid. BCAAs add little if your total protein intake is adequate. Most of the rest of the aisle is selling you something you could get from food or do not need.
The short version
- Work out your target: bodyweight in kg × 1.6, going higher if you are dieting.
- Hit it consistently. This is 90% of the job.
- Spread it over three to five meals with roughly 30 g or more in each.
- Do not worry about the thirty-minute window unless you trained fasted.
- Use powder if it helps you hit the number, and skip it if it does not.
This is general information for healthy adults, not personalised dietary or medical advice. If you have a kidney condition, are pregnant, or are managing any medical condition affecting your diet, check with a doctor or registered dietitian before making significant changes.