How much protein do you need to build muscle?

Aggiornato il: giu 29

You decided to build some muscle and you know that signing up to a gym or start working out alone won't cut it and you’re determined to play all your cards to build muscle in the most efficient way.

You also know that you should probably eat more protein but here’s where the confusion starts.

Key takeaways:

  1. To build muscle efficiently we need to focus on improving muscle protein synthesis.

  2. When trying to build muscle eating more protein and training with resistance training it’s your best shot

  3. There are many important reasons to increase your protein intake other than increasing muscle protein Synthesis.

  4. Eating 1.6 g of protein per kg of body weight per day allow you to make the best gains.

  5. During a calorie deficit, increase your protein up to 2-2.2 grams/kg of bodyweight.

  6. Spread your protein over 3-5 meals/day which will lead you to eat 0.2-0.5 g of protein per kg of body weight per meal or 20-40 g / meal.

  7. Some protein has a better amino acid profile and better stimulate Muscle Protein Synthesis. Animal protein has all the necessary amino acids to build muscle. Vegans should mix different sources or supplements with a protein drink (Such as brown rice and pea protein) if this is not possible.

  8. Protein powder is totally ok to use and can provide a valid implementation for busy people who would otherwise struggle to eat enough protein from whole sources.

Is not just about the amount

When people ask ‘’How much protein do I need?’’ Unfortunately, they are missing part of the matter.

You see, our body needs protein for various processes and muscle building is one of them.

Imagine building muscle like building a wall, every brick wall is an important component of the wall, but first, not every brick wall is created the same, in fact, some are better than others (more on this later) and second if a brick wall was damaged, you wouldn't want to use it, especially at the beginning of the construction.

Our body produces new protein and breaks down the old ones every day so that a state of biochemical balance (homeostasis) is maintained and the body has enough protein to satisfy the demands of our life.

It’s like our body is naturally replacing the old, damaged brick wall with new, fresh ones, every single day.

The process of adding new brick walls is called Muscle Protein Synthesis (MPS) and the process of breaking down the old brick walls is called Muscle Protein Breakdown (MPB).

This process is called Muscle Protein Turnover and the difference between MPS and MPB is called Net Protein Balance.

In this article, these terms will be used deliberately so I just wanted to make sure we understand each other.

Over a long period of time, how’s your balance?

Every day you might add more new brick walls than you break down and in this way, your wall will start to grow.

Great! You’re on the right track to adding size to those muscles.

But what happens if you are adding new brick walls very slowly and you’re not replacing old brick walls fast enough?

Your wall will stop growing.

If you want to build muscle, you need to make sure the balance between MPS and MPB is positive.

So, can we not just slow down the MPB?

Research on rats shows that suppressing MPB genetically does not result in an increase but rather a decrease in muscle size. I find this interesting!

It also seems that we can’t influence too much MPB and that we can indeed influence MPS through Resistance Training and Nutrition.

I want to mention that, if you don’t train at all and you still want to build muscle, you can skip the part of the timing of distribution of protein over the course of a day and focus on protein quality and quantity.

How to maximise Muscle Protein Synthesis?

There are different ways to make sure your MPS is working at full speed.

Wouldn’t it be good if our muscles grew just by eating more protein?

Unfortunately, our body doesn’t work like that.

The muscle protein synthesis remains quite elevated in the hours after a resistance training workout and the nutrients in your blood are directed towards your muscle.

In this article we’ll focus on the Dietary aspect of Protein to build muscle but if you want to dig into the research, here are some of the non-dietary factors that influence MPS.

A higher amount of Training Volume increases MPS than lower training volume

Training a muscle group 1xweek vs 3xweek promotes superior hypertrophy stimulus

Training Age lower the MPS over time

Resistance exercise with short (1 min) inter-set rest duration attenuated myofibrillar protein synthesis during the early postexercise recovery period compared with longer (5 min) rest duration, potentially through compromised activation of intracellular signalling.

The picture below shows how improving your nutrition can allow you to increase MPS but it can also help you to regenerate your muscle after workouts, restore the reserve of glycogen in your muscle and liver, reduce fatigue and boost your immune health.

All this combined will enhance your recovery and lead to lower injury risk and allow you to tolerate more training volume, which will end up in having a better MPS response and more muscle.

Can you absorb more than 30 g/meal?

I call this Protein Absorption Confusion.

As coaches, we’re used to coming up with catchy names.

Let’s make some clarity first.

Protein starts being digested in the stomach and are broken down into their mini building brick wall blocks (amino acids and di- and tripeptides) and absorbed in the small intestine.

Some people, when they ask this question, they usually want to know ‘’how much protein will be used to build muscle after a certain meal’’ and ‘’can you convert more than 30g of protein/meal?’’

In regards to protein absorption, virtually all the protein that are eaten are absorbed by healthy subjects.

For this study, it seems clear that a dose of 20 of protein is enough to fully stimulate MPS in healthy subjects although, we also know that larger individuals need larger amounts of protein so it’s better to focus on recommendations based on protein per kg of body-weight.

For this study instead, it’s clear how lean, untrained subjects lost more fat and were able to increase their Lean Body Mass when eating 2.4 g of protein/kg of body weight/day compared to 1.-2 g / kg of body weight/day.

P.S. This study is another example of how people can perfectly tolerate larger doses of protein/meals and the idea that a maximum absorption dose is 20g/meal is a myth.

If you’re not sure maybe this review will change your mind.

As the author states: ‘’Protein needs for energy-restricted resistance-trained athletes are likely 2.3-3.1g/kg of FFM scaled upwards with the severity of caloric restriction and leanness’’.

That’s a lot of protein every day! If you apply this to a normal life circumstance you will realize that you will end up consuming more than 20 g / meal in some meals.

This tells us that eating 0.25 - 0.5 g of protein/kg of body weight every meal is probably going to be optimal.

How many meals should you eat per day?

This study compared the effect of eating 8 meals x 10 g of protein, 4 meals of 20g and 2 meals of 40 g.

The big limitation of this study was certainly the total amount of protein consumed which was considerably lower than what the evidence we just saw suggests, but it shows that eating 4 meals had a better MPS response over the course of a 12 hours window.

This is aligned with this study that showed how spreading your protein evenly across meals has a 25% better muscle protein synthesis than shifting a large protein meal toward the end of the day.

It seems that eating 3-5 meals/days with 0.25-0.5 g of protein/kg of body weight is the sweet spot for most of us.

Listen to The Lean Muscle Warriors Podcast - ''How a busy professional got a beach body at the age of 36''

Do I need to increase my protein intake when trying to build muscle?

The protein recommendation to maintain health is 0.8-1 g of protein/kg of body weight.

For active healthy individuals who want to build muscle and/or lose fat, this intake goes up to 1.6-2.5 g / kg of Bodyweight.

It seems intuitive to think during a muscle-building phase to increase your protein intake and decrease it when on a calorie deficit.

It’s actually the opposite!

When you’re trying to build muscle you should eat in a caloric surplus.

It’s true that you can build muscle by eating at maintenance (when you maintain your body weight through a period of time) especially if you’re a novice to training, this will be more and more difficult as you gain training experience.

Check the Ultimate Guide to Recomp

Being in an energy surplus means that the amount of calories you eat exceeds the energy demands of your body in a given period of time.

We just learned how that higher protein intake allowed subjects on a diet to retain more muscle and lose more fat compared to a lower protein intake.

Basically, when you start dieting you can’t expect to keep eating the same amount of protein and keep building muscle because you are eating LESS overall calories and now you’re in a context of catabolism so you should increase your protein intake over the course of the diet.

There are other important reasons why you should increase your protein intake during a diet, such as:

-An increased sense of satiety fullness from your diet that will allow you to keep being satisfied even if you are eating fewer calories;

-A higher Thermogenic Effect, which will allow you to burn more calorie because protein is harder to be digested;

-MPS’s goes down (-24%) during a (-33%) calorie deficit

-MPS‘s baseline is reduced during a diet

-MPS’ sensitivity to food goes down during a cut.

There are several other studies that confirm the idea that subjects that consumed a hypocaloric diet that is higher in protein and lower in carbohydrate, experienced more favourable alterations in body composition (1-4).

If you feel like eating more than that because it adapts to your lifestyle there are likely no downsides to it.

This research, this one and this one, are all made on huge amounts of protein, some of them with up to 4g of protein /kg of body weight/ day shows no ill side effects.

I think this is good news since at some point, being in a surplus makes eating large amounts of protein very complicated and in some cases not enjoyable at all.

I know you might be thinking ‘’What? Being in a surplus not enjoyable? On which planet do you live?’’ but try to eat 2g of Protein/kg of body weight in a large surplus of 500-1000 calories over your maintenance and you’ll realise how challenging that is in the long term.

Should you eat some protein before going to bed?

Many trainees have slammed down 20-40 g of casein before going to bed without any scientific evidence that that was actually helpful.

Was that broscience or did the bros actually get it right in this case?

This is quite clear in this study.

As you can clearly see, the subjects in this study were following a resistance training program and had a better MPS when ingesting 40g of protein before bed compared to resistance training alone, resting, or resting with 40g of protein before bed.

Which kind of protein should I eat?

Not all brick walls are created equal.

Protein is made by little building blocks called amino acids.

Some protein sources elicit a better MPS response because they contain a better amino acid profile.

One amino acid in particular, Leucine, have been shown to have a greater effect on MPS compared to other protein sources without the same amount of Leucine.

This chart shows the leucine content of different foods.

Choose your protein sources carefully and notice that when you eat a balanced diet made of 75-80% whole and minimally processed and you aim to follow the protein guidelines included in this guide you will have plenty of high-quality protein sources.


Protein is definitely an important macronutrient for you if your goal is to build muscle.

In my experience eating more quality protein, it’s about creating a protein list with food sources you enjoy and come up with 6-7 recipes based on those sources.

Use your imagination and try to see if you can use plates from your childhood and adapt them to make them gains friendly.

In this way, you will know what to buy at the grocery store, what you need to cook in bulk every week and in a few weeks it will feel pretty automatic and easy.

Practice makes consistency.

Since building muscle is a slow process don’t shovel down incredibly large amounts of protein in a short period of time as this would be dumb and will increase your chances of stop training and improving your diet.

Eating more protein it’s definitely a challenge for all of us!

Here you can find some visual ideas to get 40 g of protein from some food sources.

At the end of the day, knowing that we can eat a little more protein when we’re trying to lose fat and a little less when we’re trying to lose fat it’s comforting and makes it way more sustainable in the long term.

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