PROTEIN, AMINO ACIDS & EVERYDAY NUTRITION

How Much Protein Do You Really Need? Why Quality Matters More Than Quantity

A practical Australian guide to protein targets, amino-acid quality, digestibility, meal distribution and changing needs from childhood to healthy ageing.

 

 

Protein Is More Than a Number on a Label

Protein has become one of the loudest conversations in modern nutrition. Supermarket shelves now carry protein yoghurts, bars, cereals, drinks and enriched snacks, while social media often treats the highest number as the best choice.

The more useful question is not simply “How much protein can I eat?” It is “How much do I need, where will it come from, how will I spread it across the day and what else does that food bring to the meal?”

Protein is present in every cell. Its amino acids are continually used in muscle, skin, connective tissue, enzymes, transport proteins, antibodies, hormones and many other structures. The body does not keep a dedicated storage tank of spare protein, so regular dietary intake matters throughout life.

This is why Protein Throughout Life: Why Your Protein Needs Change With Age is such an important companion to this guide.

How Much Protein Do Australian Adults Need?

Australia and New Zealand use Nutrient Reference Values to describe population needs. For adults aged 19–70, the Recommended Dietary Intake is 0.84 g/kg/day for men and 0.75 g/kg/day for women. The RDI is designed to meet the needs of nearly all healthy people in the relevant group.

A calculation begins with body weight:

 

These figures are starting points, not a score to beat. They also refer to grams of protein, not grams of food. A 100 g serving of fish, tofu or yoghurt is not 100 g of protein.

 

Why One Number Cannot Describe Everyone

Protein needs are influenced by age, growth, pregnancy, breastfeeding, activity, training volume, energy intake, injury, surgery, illness, muscle mass and individual health. A reference value for a healthy sedentary adult is not automatically the right target for a growing teenager, endurance athlete, new mother or older adult rebuilding strength.

 

The wider life-stage picture is explored in Protein Throughout Life: Why Your Protein Needs Change With Age.

What Athletes Need to Know

The Australian Institute of Sport notes that athletes in heavy training commonly use targets around 1.2–1.6 g/kg/day, with higher ranges sometimes used in carefully managed fat-loss phases when preserving lean mass is a priority. Training type, goals and total energy intake all matter.

Athletes also benefit from distributing protein across several eating occasions rather than treating dinner as the only substantial protein meal. Food remains the foundation; convenient powders, drinks and functional foods can help when travel, appetite, timing or preparation makes a normal meal impractical.

The practical details are explored in High-Protein Foods: The Foundation of Muscle, Healthy Ageing & Recovery Nutrition and Why Protein and Resistance Training Work Better Together.

Protein Quality: What Does It Actually Mean?

Protein quality refers to a food’s capacity to provide the essential amino acids the body cannot make in sufficient amounts, together with how well those amino acids are digested and become available.

Scientists use tools such as PDCAAS and DIAAS to compare protein sources. DIAAS examines the digestibility of individual indispensable amino acids at the end of the small intestine. It is useful, but no single score captures the whole nutritional value of a food, the rest of the meal or the way different foods complement one another across a day.

 

For a deeper explanation, read Protein Quality vs Quantity: Why Both Matter for Health & Healthy Ageing.

Complete Proteins and Complementary Plant Proteins

Foods such as eggs, dairy, fish, meat, poultry and soy contain all nine essential amino acids. This is why they are commonly described as complete proteins.

Plant foods including legumes, grains, nuts and seeds also make meaningful contributions. Some contain lower proportions of particular essential amino acids, but real diets combine foods. Lentils with rice, hummus with wholegrain bread, or beans with grains illustrate how different profiles can complement one another.

There is no need to combine every plant protein with scientific precision at each mouthful. Variety across meals and days is the more useful consumer principle, provided overall energy and protein intake are adequate.

Why Amino Acids Change the Conversation

Proteins are made from amino acids, and amino acids are both building materials and participants in metabolism. Leucine is well known for its role in signalling muscle protein synthesis. Lysine, methionine and the other essential amino acids must also be available because the body cannot finish a complete new protein if an essential component is missing.

Glycine and proline are prominent in collagen-rich tissues. Hydroxyproline is a characteristic collagen-associated amino acid. These amino acids help explain why collagen, gelatine and bone broth have a different nutritional identity from whey, eggs or soy.

Explore the foundations in Amino Acids The Building Blocks, Collagen Amino Acids Explained: Glycine, Proline & Hydroxyproline and The Amino Acids in Bone Broth: What They Are and Why They Matter.

Different Proteins Can Serve Different Purposes

 

The comparison is explored in Whey Protein vs Collagen & Bone Broth: Understanding the Difference and Bone Broth vs Collagen vs Protein.

Where Broth + Co Bone Broth Fits

Broth + Co bone broth powder provides approximately 5 g of naturally occurring protein per serve. Independent analysis has also confirmed a wide amino-acid profile, including glycine, proline and other amino acids associated with its collagen-rich raw materials.

Its value is practical as well as nutritional. It is a savoury whole food that can be prepared as a warm drink or used in soups, stews, sauces, risotto, grains and vegetable dishes. It does not need to compete with eggs, fish, legumes or dairy; it can sit alongside them within a varied protein pattern.

Learn more in Bone Broth Benefits: The Complete Guide to Gut Health, Protein, Recovery & Healthy Ageing and browse our collection of nourishing recipes.

Does Protein Timing Matter?

The body responds to protein after each meal, which is why distribution matters. A day containing very little protein until a large evening meal provides a different pattern from one containing meaningful protein at breakfast, lunch and dinner.

This does not mean every meal must contain an identical number. Appetite, culture, training and routine matter. A useful starting point is simply to identify meals that are routinely low in protein and strengthen them with foods that suit the meal.

For more detail, read Protein Timing for Health, Performance & Recovery.

 

A Simple Way to Estimate Your Intake

Start with the relevant Australian RDI, then consider whether your life stage, training or recovery changes the picture. Next, look at an ordinary day and estimate the protein provided by your usual portions. Food labels, the Australian Food Composition Database or an accredited practising dietitian can help when precision matters.

·       Do not count the weight of the food as grams of protein.

·       Include drinks, snacks and mixed dishes, not only the obvious centre-of-plate food.

·       Check whether breakfast and lunch contribute meaningfully.

·       Consider the variety and essential-amino-acid quality of the whole day.

·       Pair intake with movement, especially resistance exercise, when muscle is the goal.

Older adults can continue with Why Seniors Need More Protein and Anabolic Resistance Explained: Why Building and Maintaining Muscle Gets Harder With Age.

Frequently Asked Questions

How much protein do adults need each day?

For healthy Australians aged 19–70, the RDI is 0.84 g/kg/day for men and 0.75 g/kg/day for women. Needs vary with age, growth, pregnancy, breastfeeding, activity, recovery and health.

Is more protein always better?

No. Adequacy matters, but very high intake does not automatically create extra benefit. The rest of the diet, energy balance, training, distribution and individual needs remain important.

What is a complete protein?

A complete protein supplies all nine essential amino acids. Eggs, dairy, fish, meat, poultry and soy are familiar examples. A varied plant-based diet can also provide all essential amino acids through complementary foods.

Is bone broth a protein food?

Yes. Broth + Co bone broth powder provides approximately 5 g of naturally occurring protein per serve and a wide amino-acid profile. Its collagen-associated profile gives it a different role from eggs, dairy, meat, fish, legumes or whey.

Does collagen count towards protein intake?

Collagen is protein and contributes amino acids to total intake. Its amino-acid profile is specialised, so it is best used within a varied diet that supplies all essential amino acids.

Do children and teenagers need protein?

Yes. Protein supports normal growth and development. Requirements change with age, body size and growth, and should be met within an energy-adequate diet containing a variety of foods.

Should protein be spread across the day?

For many people, including a meaningful protein source at several meals is more practical than relying on one very large evening serve. This is especially relevant for athletes and older adults.

Summary

Protein quantity and quality are partners, not rivals. The body needs enough total protein, but it also needs digestible essential amino acids and an overall diet capable of supporting growth, maintenance, movement and repair.

The memorable question is not “Which protein wins?” It is “Does my day provide enough of the right building materials, in foods and meals I can sustain?” A varied pattern of animal or plant proteins, collagen-rich foods where enjoyed, functional options where useful and regular movement provides a much stronger foundation than chasing the largest number on a packet.

Scientific References

·       National Health and Medical Research Council. Nutrient Reference Values for Australia and New Zealand: Protein.

·       Australian Institute of Sport. Sports Supplement Framework: Isolated Protein Supplements.

·       Rutherfurd SM, Moughan PJ. Protein quality as determined by the Digestible Indispensable Amino Acid Score. Nutrition Reviews. 2016.

·       Matthews JJ, et al. Understanding Dietary Protein Quality: Digestible Indispensable Amino Acid Scores and Beyond. Journal of Nutrition. 2025.

·       Herreman L, et al. Comprehensive overview of the quality of plant- and animal-sourced proteins based on DIAAS. Food Science & Nutrition. 2020.