If you've ever tried to improve your diet, you've probably heard the term "macros." But what exactly are macronutrients, and why do they matter?
What Are Macronutrients?
Macronutrients are the three main categories of nutrients your body needs in large amounts to function: protein, carbohydrates, and fats. Each plays a distinct role in keeping you healthy, energised, and performing at your best.
Unlike micronutrients (vitamins and minerals), which you need in tiny amounts, macros provide the calories that fuel everything from your morning walk to your brain processing this article.
Protein: The Builder
Protein is made up of amino acids — the building blocks your body uses to repair muscle, produce enzymes, and support immune function.
How much do you need? A good starting point is 1.6–2.2 grams per kilogram of body weight if you're active. For a 75 kg person, that's 120–165 g per day.
Best sources:
- Chicken, turkey, and lean beef
- Fish and seafood
- Eggs and dairy
- Legumes, tofu, and tempeh
Carbohydrates: The Fuel
Carbs are your body's preferred energy source. They break down into glucose, which powers your muscles and brain.
Not all carbs are created equal. Complex carbs (whole grains, vegetables, legumes) provide sustained energy, while simple carbs (sugar, white bread) cause rapid spikes and crashes.
How much do you need? This varies widely based on activity level, but 3–5 g per kg of body weight is a solid range for moderately active people.
Fats: The Essential
Dietary fat is critical for hormone production, brain health, and absorbing fat-soluble vitamins (A, D, E, K). Despite its bad reputation in the 90s, fat is not the enemy — it's essential.
How much do you need? Aim for 0.8–1.2 g per kg of body weight. Focus on unsaturated fats from olive oil, nuts, avocado, and fatty fish.
Why Tracking Macros Works
Calorie counting tells you how much you're eating. Macro tracking tells you what you're eating. Two meals with the same calories can have wildly different effects on your energy, satiety, and body composition.
This is where tools like Healthly come in. Instead of manually logging every gram, you can snap a photo of your meal and get an instant macro breakdown — making tracking effortless.
Getting Started
- Calculate your targets using your weight, activity level, and goals
- Track consistently for at least two weeks to build awareness
- Adjust based on results — not every formula is perfect for every body
- Focus on food quality — hitting your macros with whole foods beats hitting them with processed ones
Understanding macronutrients is the foundation of effective nutrition. Once you know what your body needs, making informed food choices becomes second nature.