How Much Protein to Build Muscle, and How to Spread It Out

If you lift weights and want to build muscle, aim for roughly 1.6 grams of protein per kilogram of body weight per day. That figure comes from a widely cited 2018 meta-analysis in the British Journal of Sports Medicine, which found that the benefit of extra protein for muscle gain levelled off around that point, with some people benefiting from a little more, up to about 2.2 g/kg. For an 80 kg person, 1.6 g/kg is about 130 g a day. Spread it across three or four meals of roughly 30 to 40 g each, and make sure you are training hard enough to give your body a reason to use it.

Where the numbers come from

The UK reference intake for protein is set to prevent deficiency in the general population, not to support muscle growth in people who lift. The NHS guidance on healthy eating is a good baseline for overall diet, but people doing regular resistance training generally benefit from more protein than that baseline.

The 2018 meta-analysis by Morton and colleagues pooled 49 trials of people doing resistance training. Its practical conclusion was that protein intake beyond about 1.6 g/kg/day did not add further muscle on average, and that 2.2 g/kg/day was a reasonable upper target for those wanting to cover individual variation. That is where most coaches’ recommendations now sit.

Two caveats worth knowing:

• The effect of protein is modest compared with training. Protein supports muscle growth. Training causes it. Without a consistent strength programme, extra protein does very little.
• Body weight is a rough guide. If you carry a lot of body fat, basing the target on your goal weight, or on lean mass from a body composition scan, avoids an unrealistically high number.

A quick way to work out your target

Body weight	Around 1.6 g/kg per day	Per meal over 4 meals
60 kg	about 95 g	about 25 g
70 kg	about 110 g	about 30 g
80 kg	about 130 g	about 32 g
90 kg	about 145 g	about 36 g
100 kg	about 160 g	about 40 g

Treat these as targets to hit most days, not exact quotas. Being 10 g under on a Tuesday changes nothing.

Why spreading it out matters

Your daily total is the main thing. How you distribute it is the second. Research on muscle protein synthesis, the process of building new muscle tissue, suggests that a meal containing a decent dose of protein switches it on for a few hours, and that eating protein across the day gives more of those windows than eating most of it at dinner.

The typical British pattern is the problem: toast or cereal in the morning with very little protein, a sandwich at lunch with a modest amount, then a large dinner. The total may be fine, but the distribution is lopsided. Shifting some protein earlier is usually the single most useful change.

A practical pattern

1. Breakfast, 25 to 40 g. Three eggs on toast, Greek yoghurt or skyr with oats and fruit, or a protein shake alongside whatever you normally eat. Our high-protein breakfast ideas go further.
2. Lunch, 30 to 40 g. A palm-sized portion of chicken, fish, tofu or a generous serving of beans and lentils, plus a carbohydrate and vegetables.
3. Afternoon, 15 to 25 g. Cottage cheese, a pint of milk, a pot of yoghurt or some jerky. Useful if lunch is early and dinner is late.
4. Dinner, 30 to 40 g. Most people already manage this.

Older adults appear to need a slightly larger dose per meal to get the same response, so if you are over 50, lean towards the upper end of these ranges rather than the lower.

What 30 grams of protein looks like

Approximate amounts, from typical UK supermarket labels. Check the label on what you actually buy.

• A medium chicken breast (about 120 g cooked)
• A fillet of salmon or cod plus a small pot of yoghurt
• Four large eggs
• Around 250 to 300 g of Greek yoghurt or skyr, depending on brand
• A 200 g block of firm tofu with a portion of edamame
• A tin of tuna plus a slice of cheese
• One scoop of whey or plant protein powder in milk

Plant sources work too. They tend to come with more carbohydrate and fibre per gram of protein, so you need larger portions and some variety. There is more in our guide to vegetarian protein sources.

Common mistakes

• Chasing protein, skipping calories. Building muscle is much easier with a small energy surplus or at least maintenance. Plenty of protein in a steep deficit mostly preserves muscle rather than building it.
• Relying on bars. Many “protein” bars are confectionery with a protein label. Fine occasionally, not a foundation.
• Going far above 2.2 g/kg. More is not harmful for most healthy people, but it crowds out carbohydrate and fibre and adds cost without adding muscle.
• Obsessing about the post-workout window. A meal containing protein within a few hours either side of training is enough. You do not need to sprint for a shake.

If you have kidney disease or another medical condition affecting your diet, check with your GP before raising protein intake significantly.

How it fits with training in the studio

When clients begin personal training at our Highgate studio, I ask what a normal day of eating looks like before suggesting any numbers. Most need one or two changes, usually breakfast and an afternoon snack, rather than an overhaul. We then track muscle trends with the InBody scanner every few weeks, which tells us whether the training and the food are working together better than the scales alone can.

If your main goal is fat loss rather than muscle gain, the targets shift slightly. That is covered separately in how much protein you need to lose fat.

Questions we get asked

Can your body only absorb 30 grams of protein at once?

No. You absorb all of it. The 25 to 40 g per meal guide is about getting a good muscle-building response from each meal, not a limit on absorption.

Do I need protein powder?

No, but it is a convenient way to fill a gap. Food first, powder where it helps.

Should I eat protein before bed?

It can help if your daily total is short. A pot of yoghurt or cottage cheese is a simple option.

Is 1.6 g/kg the same for women?

Yes, the same per-kilogram guide applies.

If you want a training plan and a simple eating pattern that support each other, coaching with Artem covers both. More about the building at The Highgate House.

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