The Fitness Zone

The Role of Protein in Muscle Building: Myths and Facts

Mar 19, 2024 | by Steve Irwin

Protein, often hailed as the cornerstone of muscle building, is a subject of fascination and debate in the fitness world. As enthusiasts strive to sculpt their bodies, the role of protein becomes increasingly pivotal. 

However, amidst the plethora of information available, myths and misconceptions often cloud the understanding of its true significance. In this article, we’ll delve into three common myths surrounding protein’s role in muscle building, and offer some guidance to counter these “myths”. 

Additionally, we’ll explore the sources of high-quality protein and the optimal strategies for incorporating it into your diet to enhance muscle growth and recovery.

Myth #1: More Protein Means More Muscles

One prevalent myth is the belief that consuming excessive amounts of protein automatically translates to increased muscle mass. 

While protein is undeniably essential for muscle growth, the body has its limits in utilising it effectively. Consuming protein beyond your body’s needs does not lead to additional muscle gain but may instead contribute to weight gain, as excess protein can be converted into fat.[1]

Consider this…

Protein Timing and Distribution Matter – Some research suggests that the timing and distribution of protein intake throughout the day plays a crucial role in muscle synthesis. Rather than loading up on protein in a single meal, spreading your protein intake evenly across meals can optimise muscle protein synthesis. Aim for a balanced distribution of protein-rich foods throughout the day to support sustained muscle repair and growth.

Myth #2: All Proteins Are Created Equal

Another misconception is that all protein sources offer the same benefits for muscle building. While it’s true that various foods contain protein, not all proteins are created equal in terms of their amino acid composition and digestibility. 

Some proteins provide a complete profile of essential amino acids necessary for muscle repair and growth, while others may lack certain amino acids or be less efficiently absorbed by the body.

Consider this…

Quality Matters – The quality of dietary protein significantly impacts its effectiveness in promoting muscle protein synthesis. Proteins from animal sources, such as meat, poultry, fish, eggs, and dairy products, are considered high-quality proteins due to their complete amino acid profiles and high digestibility. Plant-based protein sources, such as legumes, tofu, tempeh, and quinoa, can also contribute to muscle building but may require careful planning to ensure adequate intake of essential amino acids.

Myth #3: Protein Supplements Are Essential for Muscle Growth

In the age of fitness supplements, there’s a pervasive belief that protein powders and shakes are indispensable for building muscle. 

While convenient and widely marketed, protein supplements are not inherently superior to whole food sources of protein. In fact, most people can meet their protein needs through a well-balanced diet without the need for supplementation.

Consider this…

Whole Foods First – Whole food sources of protein offer not only protein but also a plethora of other essential nutrients vital for overall health and muscle function. While protein supplements can be convenient for athletes with increased protein requirements or those who struggle to meet their needs through diet alone, they should not replace whole food sources of protein. Prioritise consuming a variety of protein-rich whole foods as the foundation of your muscle-building diet.

Optimising Protein Intake for Muscle Building

Now let’s explore the best sources of protein and how to incorporate them into your diet effectively.

Sources of High-Quality Protein

Animal-Based Sources:

Lean meats such as chicken, turkey, and beef

Fish and seafood like salmon, tuna, and shrimp

Eggs and dairy products such as milk, yoghourt, and cheese

Plant-Based Sources:

Legumes including beans, lentils, and chickpeas

Soy products like tofu, tempeh, and edamame

Quinoa, buckwheat, and other whole grains

Nuts and seeds such as almonds, walnuts, chia seeds, and hemp seeds

Protein Intake Guidelines

The Australian Dietary Guidelines offer recommendations for protein intake based on age, gender, and level of physical activity. [2] Here’s an overview of the protein recommendations according to the guidelines:

General Population: The Australian Dietary Guidelines recommend a daily protein intake based on age and gender.

Adults (19-70 years old):

Recommended Dietary Intake (RDI) for protein: 0.84 grams per kilogram of body weight per day for men and women.

Elderly Adults (70 years and older):

RDI for protein: 1.07 grams per kilogram of body weight per day for men and women.

Adjusting for Physical Activity:

The guidelines don’t provide specific protein recommendations based on physical activity levels. However, individuals who engage in regular physical activity or have higher muscle mass due to strength training may require slightly more protein to support muscle repair and growth.

Example Calculations:

Let’s calculate the daily protein requirements for a sedentary male and a moderately active female using the Australian Dietary Guidelines:

  • Male (Sedentary):

Protein intake = Body weight (kg) × RDI (0.84 grams/kg)

Protein intake = 70 kg × 0.84 g/kg = 58.8 grams of protein per day

  • Female (Moderately Active):

Protein intake = Body weight (kg) × RDI (0.84 grams/kg)

Protein intake = 60 kg × 0.84 g/kg = 50.4 grams of protein per day

For individuals with higher physical activity levels, protein intake may be adjusted within the recommended range while still adhering to overall energy needs and dietary balance.

IMPORTANT NOTE: These are basic guidelines and it’s recommended that you consult with a healthcare professional or registered dietitian for personalised recommendations.

Incorporating Protein Into Your Diet:

  1. Balance Your Meals: Include a source of protein in each meal and snack to support muscle repair and growth throughout the day.
  2. Prioritise Post-Workout Nutrition: Consume a protein-rich snack or meal following your workouts to replenish glycogen stores and facilitate muscle recovery.
  3. Choose Whole Foods: Emphasise whole food sources of protein over supplements to maximise nutrient intake and support overall health.
  4. Experiment with Timing: Experiment with timing your protein intake around workouts to optimise muscle protein synthesis and recovery.
  5. Stay Hydrated: Adequate hydration is essential for optimal protein utilisation and muscle function, so remember to drink plenty of water throughout the day.

The Journey in the Body of Protein

The journey of dietary protein from ingestion to utilisation by the body involves a series of complex processes orchestrated by the digestive system. Let’s explore how proteins from food are broken down, absorbed, and transported into the bloodstream to serve as essential resources for various physiological functions.

  • 1. Ingestion and Digestion:

The process begins with the ingestion of protein-rich foods, such as meat, fish, dairy products, legumes, nuts, and seeds. Proteins are composed of long chains of amino acids, which are the building blocks of proteins.

Upon entering the stomach, dietary proteins encounter the acidic environment, which denatures the protein structure, unfolding it and exposing peptide bonds. Gastric enzymes, primarily pepsin, begin breaking down the protein chains into smaller peptide fragments.

  • 2. Further Breakdown in the Small Intestine:

The partially digested protein, along with other nutrients, passes into the small intestine, where the majority of nutrient absorption occurs. Here, pancreatic enzymes, including proteases such as trypsin, chymotrypsin, and carboxypeptidase, continue the breakdown of protein into smaller peptides and individual amino acids.

  • 3. Absorption:

Within the lining of the small intestine, specialised cells called enterocytes facilitate the absorption of nutrients, including amino acids. Peptide transporters located on the surface of enterocytes actively transport dipeptides and tripeptides, as well as specific amino acids, across the cell membrane into the enterocytes.

Once inside the enterocytes, intracellular enzymes further break down dipeptides and tripeptides into individual amino acids. These amino acids are then transported across the basolateral membrane of the enterocytes into the bloodstream via specific transport proteins.

  • 4. Transport in the Bloodstream:

After absorption, amino acids are released into the bloodstream and transported to various tissues and organs throughout the body. The bloodstream serves as the conduit for delivering amino acids to cells for protein synthesis, energy production, and other metabolic processes.

  • 5. Utilisation by Cells:

Once inside cells, amino acids are utilised for a multitude of functions:

Protein Synthesis: Amino acids serve as the building blocks for synthesising new proteins, which are essential for tissue repair, muscle growth, enzyme production, and numerous other biological processes.

Energy Production: In times of energy need, amino acids can be converted into glucose through a process called gluconeogenesis, providing fuel for cells, particularly in situations of prolonged fasting or low carbohydrate intake.

Synthesis of Non-Protein Molecules: Amino acids also serve as precursors for synthesising various non-protein molecules, including neurotransmitters, hormones, nucleotides, and creatine.

  • 6. Excretion of Waste Products:

Any excess amino acids that are not immediately needed for protein synthesis or other metabolic processes may be metabolised for energy or converted into storage forms, such as glycogen or fat. The by-products of amino acid metabolism, including ammonia and urea, are ultimately excreted by the kidneys in the form of urine.


In conclusion, protein plays a pivotal role in muscle building and repair, but it’s essential to separate fact from fiction when it comes to optimising your intake. Do your research so  you can make informed decisions about your diet and exercise regimen to achieve your muscle-building goals effectively. Remember to prioritise whole food sources of protein, balance your meals, and tailor your intake to support your individual needs and fitness objectives. With a strategic approach to protein consumption, you can unlock your body’s full potential for muscle growth and recovery.

Please Note: The information provided in this article are the opinions and professional experience of the author and not all activities are recommended for the beginner or participants with underlying health conditions. Before following any advice or starting any fitness, health and wellbeing journey please consult with an Allied Health Professional and / or General Practitioner.


  1. Can too much protein make you fat?
  2. Australian Dietary Guidelines
Steve Irwin

Steve Irwin

Steve has spent the last 19 years in the Australian Fitness Industry as a Group Fitness Instructor, 1-1 Coach, State Manager, Business Owner and is currently an Educator for the Australian Institute of Fitness. A lifelong fitness enthusiast he started his working life in the Military which guided him into the fitness industry where his passion for helping others on their health and fitness journey has been realised. Steve believes that for anyone thinking about getting fit or healthy they should “just get started” as “doing something is better than doing nothing”.

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