What Are Macros? A Complete Beginner Guide to Macronutrients

What Are Macros?

Macronutrients — or macros — are the three main nutrients your body uses for energy: protein, carbohydrates, and fat. Every food you eat contains some combination of these three.

Protein

Protein builds and repairs muscle tissue. It also keeps you full longer than carbs or fat. Good sources include chicken, eggs, Greek yogurt, and legumes. Aim for 0.7–1g per pound of bodyweight if you are active.

Carbohydrates

Carbs are your body primary fuel source. They power your brain and muscles. Focus on complex carbs like oats, rice, sweet potatoes, and fruit over processed sugars.

Fat

Fat supports hormone production, brain health, and absorption of vitamins A, D, E, and K. Healthy sources include avocado, olive oil, nuts, and fatty fish.

Why Track Macros?

Counting calories tells you how much you are eating. Tracking macros tells you what you are eating. Two people can eat 2000 calories with very different results depending on their macro split. A high protein diet preserves muscle while losing fat. A balanced macro split supports sustained energy throughout the day.

How to Track Macros Easily

Manually tracking macros means weighing food and logging every meal — time consuming and easy to get wrong. FoodNutriScan uses AI photo scanning to instantly return calories, protein, carbs, and fat for any meal you photograph. No logging, no guessing.