Macros 101: A Beginner's Guide to Protein, Carbs and Fat

Once you know your calorie target, the next question is: what should those calories be made of? That is where macronutrients — protein, carbohydrates, and fat — come in.

The big three

• Protein — 4 kcal/g: builds and repairs muscle, skin, and organs; keeps you full. Found in meat, eggs, dairy, lentils, beans, and nuts.
• Carbohydrates — 4 kcal/g: your body's preferred energy source, especially for the brain and intense exercise. Found in rice, wheat, potatoes, fruits, and oats.
• Fat — 9 kcal/g: essential for hormones, vitamin absorption, and cell health. Found in oils, ghee, nuts, seeds, and fatty fish.

Do not forget fiber (25–30g per day): it keeps digestion healthy, steadies blood sugar, and helps you feel full. Vegetables, fruits, lentils, and whole grains are your best sources.

How much of each?

A solid starting split for most people:

• Protein: 1.2–1.6g per kg of body weight (higher if training hard)
• Fat: 20–30% of total calories
• Carbs: whatever calories remain

Example at 2,000 kcal/day for a 70 kg active person: ~110g protein (440 kcal), ~55g fat (495 kcal), and ~265g carbs (1,060 kcal).

Quality matters as much as quantity

200 calories of lentils and 200 calories of candy are not equal. Prioritize whole foods: lean proteins, whole grains, vegetables, fruits, and healthy fats. That does not mean never eating treats — it means treats fit inside your targets rather than replacing real meals.

Start tracking

The fastest way to learn macros is to log what you already eat for a week. Most people discover one clear pattern — usually too little protein, too much fat, or sneaky liquid carbs. NutriCounter's meal log breaks every entry into protein, carbs, and fat automatically, so you learn as you log.