Nutrition
How Much Protein to Build Muscle (UK Guide, 2026)
Protein is the one nutrition variable that reliably changes how much muscle you build. Get it right and training does its job. Get it wrong and you plateau no matter how hard you lift. This guide gives you the exact daily target, how to split it across the day, what to eat in the UK, and the mistakes that quietly cost people muscle for years.
The daily target, in one number
The strongest evidence, summarised across meta-analyses from Morton, Schoenfeld and Phillips, lands on 1.6 to 2.2 grams of protein per kilogram of bodyweight per day for anyone actively resistance training and trying to build muscle. Below 1.6g/kg you leave gains on the table. Above 2.2g/kg you get almost no extra benefit for the extra food.
If you are in a calorie deficit and trying to hold muscle while losing fat, push toward the top of that range or slightly beyond, up to 2.4g/kg. Protein is protective against muscle loss when calories are low.
Use bodyweight in kilograms. A 70kg person needs 112 to 154g per day. An 85kg person needs 136 to 187g. A 95kg person needs 152 to 209g. Round to a whole number you can hit consistently and stop overthinking the decimals.
How to split it across the day
Muscle protein synthesis, the biological process that actually builds muscle, is triggered per meal, not per day. A single 150g protein hit at dinner is worse than 4 meals of 35 to 40g spread across the day, even if the total is identical.
The practical rule: 3 to 5 meals per day, each containing 30 to 45g of protein. Every meal should include a clear protein source, not just carbs and fats with a trace of protein on the side.
- Breakfast: 30 to 40g (eggs, Greek yoghurt, whey, smoked salmon)
- Lunch: 35 to 45g (chicken, tuna, tofu, cottage cheese, lean beef)
- Snack or pre-workout: 20 to 30g (whey shake, skyr, biltong)
- Dinner: 35 to 45g (salmon, mince, halloumi, chicken thighs)
- Optional pre-bed: 20 to 30g casein or Greek yoghurt if training hard
Best UK protein sources, ranked by cost and convenience
You do not need expensive supplements. Whole food gets you 80% of the way. Use the list below to build meals around whatever you already buy at Tesco, Sainsbury's, Aldi or Lidl.
Protein content of common UK foods
| Food (100g cooked unless stated) | Protein | Rough UK cost / 30g protein |
|---|---|---|
| Chicken breast | 31g | £1.10 |
| Lean beef mince (5%) | 26g | £1.40 |
| Salmon fillet | 25g | £2.20 |
| Tinned tuna in spring water (per tin) | 24g | £0.80 |
| Eggs (per large egg) | 6g | £0.90 (5 eggs) |
| Greek yoghurt 0% (200g) | 20g | £0.75 |
| Cottage cheese (200g) | 22g | £0.90 |
| Whey protein (per scoop) | 22 to 25g | £0.35 |
| Firm tofu (200g) | 24g | £1.30 |
| Red lentils (100g dry) | 24g | £0.30 |
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FAQ
Can I build muscle on less than 1.6g/kg of protein?
You can, but slower. Studies consistently show hypertrophy improves as protein rises from around 1.2g/kg up to about 1.6g/kg, then plateaus by 2.2g/kg. Below 1.2g/kg you are actively limiting your results.
Is too much protein bad for your kidneys?
In healthy adults, no. Reviews going back decades find no evidence that high-protein diets damage kidney function in people who start with healthy kidneys. If you already have kidney disease, follow your doctor's advice.
Do I need protein straight after training?
The 'anabolic window' is much wider than the 30-minute myth. What matters is hitting your total daily protein across multiple meals. A post-workout protein hit is convenient, not essential.
Is whey better than food?
Whey is a food, just a very convenient one. It digests fast and is high in leucine, the amino acid that switches on muscle building. Use it to top up when whole food is inconvenient, not as a replacement for meals.
Can vegetarians and vegans build muscle just as well?
Yes, but you need to be more deliberate. Aim for the top of the range (around 2.0 to 2.4g/kg), mix protein sources across the day (soy, pea, legumes, grains), and include a serving of soy or a complete plant blend at each meal.
How much protein for fat loss?
Push protein higher when cutting: 2.2 to 2.4g/kg. It preserves muscle, keeps you fuller and has the highest thermic effect of any macronutrient, meaning you burn more calories digesting it.
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