How to Track Macros: A Beginner's Guide

Tracking macros means logging how much protein, carbohydrate and fat you eat — the three nutrients that make up all of your calories. You set a target for each based on your goal, then log your food and try to hit them. Do it consistently and you control not just how much you eat, but the quality and composition of it.

Here’s the beginner-friendly version.

What are macros?

“Macros” is short for macronutrients. There are three, and each carries a fixed amount of energy:

• Protein — 4 calories per gram. Builds and preserves muscle, keeps you full.
• Carbohydrate — 4 calories per gram. Your body’s main energy source, especially for training.
• Fat — 9 calories per gram. Essential for hormones and absorbing vitamins.

(Fiber is a type of carb worth tracking on its own — it aids digestion and fullness.) Add up your macros and you get your calories, which is why tracking macros automatically tracks calories too.

How much of each should you eat?

Start with protein, then fat, then let carbs fill the rest of your calorie budget.

Protein

The most important macro for body composition. A good range is 1.6–2.2 g per kg of body weight — higher when you’re in a calorie deficit or building muscle, to protect lean mass.

Fat

Don’t go too low. Keep fat at roughly 20–30% of your calories, with a floor around 0.8 g per kg for hormone health.

Carbs

Carbs are the flexible one — they get the calories left after protein and fat. If you train hard, lean toward more carbs; if you prefer, lean toward more fat. Both work.

Macro splits by goal

Goal	Protein	Carbs	Fat
Fat loss	High	Moderate	Moderate
Muscle gain	High	High	Moderate
Maintenance	Moderate	Moderate	Moderate

The constant across every goal is high protein. Get that right and the rest is mostly personal preference.

How to actually track macros

1. Set your calorie target using a TDEE calculator.
2. Set your protein target (1.6–2.2 g/kg), then fat, then carbs as the remainder.
3. Log everything you eat and watch the running totals.

The catch is step 3. Manually entering macros for every meal is exactly why people burn out. A photo tracker fixes it: snap your plate and LensNutra breaks it into protein, carbs, fat and fiber automatically, rolling each into your daily targets — no math, no database searching.

Do you have to track macros forever?

No. Most people track for a few months to learn what balanced portions look like, then loosen up while keeping an eye on protein. The education sticks even when the logging stops.

The bottom line

Macros are just protein, carbs and fat. Prioritize protein, keep fat reasonable, fill the rest with carbs, and log consistently. A photo-based tracker removes the tedium so you’ll actually keep it up.

Start tracking your macros with LensNutra — one photo per meal.