What are macros and do you need to track them?
You've probably heard people talk about "hitting their macros" or "tracking macros." But what does that actually mean - and do you need to do it too?
What are macros?
"Macros" is short for macronutrients - the three main categories of nutrients that make up the calorie content of everything you eat. They are:
Carbohydrates
Protein
Fat
That's it. Every food you eat contains some combination of these three things, and each one plays a different role in your body. Alcohol is sometimes considered a fourth macronutrient since it contains calories, but it's not essential for survival the way the other three are.
You might also hear the word "micronutrients" - these are vitamins and minerals. They're essential for health but they don't contain calories, which is why they're not part of the macro conversation.
What does each macro do?
Carbohydrates are your body's preferred and most efficient fuel source. They break down into glucose which your body uses for energy - particularly for your brain and during high intensity exercise. They also provide fibre which supports gut health and keeps you full.
Protein builds and repairs tissue - muscle, skin, enzymes, hormones. It's also the most satiating macro, meaning it keeps you full longer than carbs or fat. Your body burns more energy digesting protein than the other macros, which makes it particularly useful if you're trying to manage your weight.
Fat supports hormone production, helps your body absorb fat-soluble vitamins (A, D, E and K), protects your organs, and keeps you satisfied after a meal. Despite its reputation, fat is essential - the key is the type and amount.
Each macro contains a different amount of energy per gram:
Carbohydrates: 4 kcal per gram
Protein: 4 kcal per gram
Fat: 9 kcal per gram
So a food that's high in fat will always be more energy-dense than a food that's high in carbs or protein, even if the serving sizes look similar.
What does "tracking macros" actually mean?
Tracking macros means logging not just your total calories but the breakdown of where those calories are coming from - how many grams of carbs, protein and fat you're eating each day.
Most calorie tracking apps like MyFitnessPal or Cronometer show you this automatically when you log your food. You set targets for each macro in grams, and the app shows you how close you are to hitting each one throughout the day.
A typical macro split for general health might look something like:
Carbohydrates: 45-65% of total calories
Protein: 15-35% of total calories
Fat: 20-35% of total calories
But these ranges vary significantly depending on your goals, your body, and your eating style. Someone following a keto diet might have carbs as low as 5% of their calories. Someone focused on building muscle might push protein to 40% or higher.
Do you actually need to track macros?
The answer depends on what you're trying to achieve.
❌ You probably don't need to track macros if:
You're new to food tracking. Starting with total calories is simpler, less overwhelming, and gives you the foundational awareness you need before adding another layer of complexity. Most people who try to track macros before they understand calories end up confused and frustrated.
You're tracking for general awareness. If your goal is simply to understand what you're eating and build better habits, calorie awareness is usually enough.
You just want to maintain your weight. Hitting a daily calorie target without worrying about the macro breakdown is a completely valid and sustainable approach for most people.
✅ Macro tracking becomes more useful when:
You're trying to build muscle. Protein targets matter a lot here - hitting enough protein consistently is one of the most evidence-backed things you can do to support muscle growth alongside resistance training.
You're trying to optimise satiety. If you find yourself constantly hungry on a calorie deficit, looking at your protein and fibre intake specifically can make a real difference.
You're following a specific dietary approach. Keto requires tracking carbs carefully. High protein diets require tracking protein. In these cases macro tracking is essentially built into the approach.
You've been tracking calories for a while and want to go deeper. Once calorie tracking feels natural, adding macro awareness is a logical next step that gives you more useful information without being overwhelming.
A note on macro "perfection"
One of the most common traps with macro tracking is treating the targets as rules rather than guides. Hitting your protein target but going 3g over on fat is not a problem. Being 10g short on carbs one day is not a problem.
Macros are a tool for awareness, not a grading system. The goal is to understand the general shape of your diet over time - not to achieve a perfect score every single day.
If macro tracking starts to feel stressful, obsessive, or like it's taking the enjoyment out of eating, it's worth stepping back to simpler calorie tracking or just general mindful eating. No tracking system is worth your mental health.
The practical takeaway
Macros are simply the three main categories of nutrients your food is made of - carbohydrates, protein and fat. Tracking them gives you a more detailed picture of your diet than calorie tracking alone, but it's not essential for everyone.
If you're just starting out, focus on total calories first. Once that feels natural, you might find it useful to pay attention to protein specifically - it's the macro that makes the biggest practical difference to satiety and body composition for most people.
Want to know how much protein you should be aiming for? Head to the free calculator here - it'll give you a personalised protein target based on your weight and goal. No email required.
Want accurate macro data for thousands of Australian foods? The Australian Calorie & Nutrition Guide has FSANZ-sourced data organised the way you actually shop.
