Quick answer: how much protein do you need for muscle growth?
For muscle growth, you need between 1.6 and 2.2 grams of protein per kilogram of bodyweight per day. At 80 kg, that comes to 128 to 176 grams of protein daily. Spread across four meals, that's 32 to 44 grams of protein per sitting, which is what maximises muscle protein synthesis.
That 1.6 to 2.2 g/kg range isn't arbitrary. It comes directly from a meta-analysis by Morton et al. (2018), published in the British Journal of Sports Medicine, which pooled 49 randomised controlled trials. Above 2.2 g/kg, the researchers found no additional benefit for muscle mass. Read the study here.
What this looks like in practice is set out below.
Protein needs by weight and goal: an overview
Optimal protein intake varies depending on your situation. Someone training recreationally has different needs from someone cutting calories whilst trying to hold onto muscle mass. The table below sets this out clearly.
| Bodyweight | Goal: muscle growth | Goal: maintenance during a cut | Goal: general health |
|---|---|---|---|
| 60 kg | 96 to 132 g/day | 132 to 156 g/day | 48 to 60 g/day |
| 70 kg | 112 to 154 g/day | 154 to 182 g/day | 56 to 70 g/day |
| 80 kg | 128 to 176 g/day | 176 to 208 g/day | 64 to 80 g/day |
| 90 kg | 144 to 198 g/day | 198 to 234 g/day | 72 to 90 g/day |
| 100 kg | 160 to 220 g/day | 220 to 260 g/day | 80 to 100 g/day |
The higher requirement during a calorie deficit makes sense. In that situation, your body needs more protein to curb muscle breakdown (catabolism). The Voedingscentrum sets the official recommendation at 0.8 g/kg for the average adult. That's a baseline for health, not enough for active trainers.
Not sure where you stand? The Bioteïne phase test can help you work out which protein intake suits your situation.
Spreading protein across the day: why timing matters
Your total daily protein intake is the most important figure. But how you spread it across the day makes a measurable difference to muscle protein synthesis.
Research by Areta et al. (2013) found that spreading 80 grams of protein across four equal 20-gram portions produced greater muscle protein synthesis than the same total consumed in two large meals. The reason: skeletal muscle has a maximum processing capacity per meal. Above roughly 40 grams per sitting, the surplus isn't used efficiently for muscle building, it's burned for energy or shunted into other metabolic pathways instead.
A practical breakdown for someone at 80 kg with a daily target of 160 grams of protein:
- Breakfast: 40 g (for example, cottage cheese with a protein shake)
- Lunch: 40 g (chicken breast, eggs or another protein-rich meal)
- Dinner: 40 g (fish, meat or pulses)
- Post-training or evening snack: 40 g (a shake or Bioteïne bar)
Four meals. Equal portions. Consistency day to day. That's the structure that works.
For more on organising your protein intake, see the Bioteïne high-protein diet guide.
Timing around training: pre and post workout
The so-called "anabolic window" is wildly overstated in mainstream fitness circles. The idea that you must drink a shake within 30 minutes of finishing a workout, or lose all your gains, simply isn't true. Research suggests the window is closer to 3 to 5 hours around a training session.
That said, timing isn't irrelevant. Two concrete guidelines are backed by evidence:
- Pre-workout (1 to 2 hours before training): a meal or snack with 20 to 40 grams of protein ensures amino acids are circulating in your bloodstream during the session, which curbs muscle protein breakdown whilst you train.
- Post-workout (within 2 hours of training): muscle protein synthesis is elevated after resistance training. A portion of 20 to 40 grams of protein within this window maximises recovery.
For most people training 3 to 5 times a week, the post-workout meal fits naturally into the day's schedule anyway. The one scenario where timing genuinely matters is fasted training early in the morning. In that case, a fast-digesting protein source straight after the session isn't a luxury, it's a practical necessity.
A Bioteïne protein shake with 25 to 30 grams of protein per serving is an efficient option here. Quick to prepare, a manageable calorie count, no fuss.
Protein doesn't work alone: the role of resistance training and a calorie surplus
Eating more protein without training won't build muscle mass. That's the first thing to understand. Protein supplies the building blocks. Resistance training is what signals your body to actually use those building blocks for muscle tissue. Without that signal, the surplus protein just gets burned or excreted.
Three factors work together for effective muscle building:
- Sufficient protein: 1.6 to 2.2 g/kg/day, spread across the day
- Resistance training: at least 2 to 3 sessions a week, with progressive overload
- Calorie surplus: for optimal muscle growth, you need 200 to 500 kcal a day above your maintenance level
That calorie surplus is where people regularly go wrong. A surplus of 200 kcal a day over eight weeks theoretically adds up to 11,200 extra kcal. Combined with training and adequate protein intake, that can translate to 0.5 to 1 kg of lean mass per month. Eating beyond this surplus just speeds up fat storage, not muscle growth.
Want to understand how nutrition and your phase of the programme fit together? The Bioteïne 4-phase system gives a structured overview per phase.
Debunking myths about protein and muscle growth
Myth 1: more protein is always better
No. Above 2.2 g/kg per day, the benefit for muscle mass plateaus. Anything extra just adds calories without extra muscle growth. At intakes of 3 g/kg or more, there can also be added long-term strain on the kidneys, particularly in people with reduced kidney function.
Myth 2: plant protein doesn't work for muscle growth
This is more nuanced than it sounds. Plant-based protein sources generally have a lower leucine content and a less complete amino acid profile than animal sources. Leucine is the amino acid that triggers muscle protein synthesis. But combine plant sources well (pea, rice, soya) and hit your total daily protein target, and the difference in muscle growth outcomes becomes minimal.
Myth 3: you can only absorb 30 grams of protein per meal
This figure has done the rounds in sports nutrition circles for years, and it's simply wrong. Your body absorbs virtually all the protein you eat from your gut. The real point is that larger portions are digested more slowly, and muscle protein synthesis doesn't increase further beyond about 40 grams per sitting. Absorption and utilisation are two different things.
Myth 4: protein shakes are essential
Shakes are a tool, not a requirement. If your daily protein target is achievable through whole foods (meat, fish, eggs, dairy, pulses), you don't need a shake. They're handy for a busy schedule, a high protein requirement, or as a post-workout option on the go. Nothing more than that.
Myth 5: eating protein automatically makes you muscular
Already covered above, but it bears repeating: without resistance training, there's no muscle growth. Protein is a building material. The building signal comes from training.
Bioteïne shakes and bars as a practical addition
If your daily protein target sits on the higher end, say 160 to 200 grams for someone at 80 to 90 kg, most people find this hard to hit through regular meals alone. Not because the right foods don't exist, but because volume, time and appetite all set practical limits.
That's precisely the gap a quality protein supplement can fill. Two concrete applications:
- Post-workout: a Bioteïne protein shake with around 25 grams of protein and under 150 kcal per serving. Quick, measurable, no need for a full meal after an evening session.
- Snack: a Bioteïne protein bar with 15 to 20 grams of protein per bar. On the go, at the office, or when lunch fell short on protein.
Both products are designed to fit into a high-protein routine without throwing off your calorie balance. The focus is on protein density per product, not filler or excess fat.
Looking for a complete starting point? The Bioteïne starter pack combines shakes, bars and guidance for the first phase of your journey.
For everyday high-protein meals, take a look at the Bioteïne meals collection, where the macros per portion are already balanced for you.
Frequently asked questions
How much protein per day do I need for muscle growth?
For muscle growth, the evidence-based guideline is 1.6 to 2.2 grams of protein per kilogram of bodyweight per day. At 80 kg, that's 128 to 176 grams. Spread this across three to four meals of 30 to 45 grams of protein each for optimal use by the muscles.
How much protein per meal is optimal for muscle growth?
Research points to 20 to 40 grams of protein per meal as the effective range for stimulating muscle protein synthesis. Portions above 40 grams don't offer extra anabolic benefit per sitting, though larger amounts are still digested and absorbed, just more slowly.
Do I need to eat protein straight after training?
Not necessarily straight away, but a portion of 20 to 40 grams of protein within two hours of training is beneficial. The anabolic window is wider than once thought. If you train fasted, a fast-digesting protein source after the session is a sensible choice.
Does plant protein work just as well for muscle growth?
Plant-based protein sources typically contain less leucine, the amino acid that triggers muscle protein synthesis. But with sufficient total protein intake and a good mix of sources (soya, pea, rice), the difference in muscle growth outcomes is limited. Hit your daily target and vary your sources.
Do I need protein shakes to build muscle mass?
No, shakes aren't essential. They're a practical tool when your daily protein target is hard to reach through whole foods alone. With a high protein requirement, a busy schedule, or a post-workout moment on the go, shakes are an efficient addition.
How many calories above maintenance do I need for muscle growth?
A calorie surplus of 200 to 500 kcal a day is a standard guideline for effective muscle growth with minimal fat gain. A larger surplus speeds up fat storage but not muscle growth. Combined with resistance training and adequate protein, this typically produces 0.5 to 1 kg of lean mass per month.
Is it true you can only absorb 30 grams of protein per meal?
No. Your body absorbs virtually all the protein you eat from your gut. The point is that larger portions are processed more slowly, and muscle protein synthesis doesn't increase further above roughly 40 grams per meal. Absorption and utilisation for muscle growth are two separate processes.
How do I know if I'm getting enough protein?
The most reliable method is tracking your intake with a nutrition app for a week. Compare your average to the 1.6 to 2.2 g/kg guideline. If recovery feels slow or your muscle mass is stalling despite regular training, low protein intake is a logical first thing to check.