Macros Explained: Protein, Carbs, and Fat (And How to Hit the Right Numbers)
If calories are the speed limit on your fat-loss highway, macros are the steering wheel. Calories say how much you change; macros say what changes — fat or muscle, energy or fatigue, hunger or satisfaction.
The three macronutrients
- Protein — the body's structural raw material. 4 kcal/g.
- Carbohydrate — the fastest fuel for hard training. 4 kcal/g.
- Fat — long-storage fuel and the building block of hormones. 9 kcal/g.
How much protein?
Protein is the only macro with a clear performance-based recommendation. The research is consistent: 1.6–2.2 g of protein per kg of bodyweight protects lean mass during a cut and builds it during a bulk. Below 1.2 g/kg, muscle loss accelerates in any deficit.
Practical examples (vegetarian-friendly)
- 70 kg adult: 112–154 g protein per day (≈ 200 g paneer + 1 cup cooked dal + 250 g Greek yogurt + a scoop of whey).
- 90 kg adult: 144–198 g protein per day (≈ 250 g tofu or tempeh + 1.5 cups cooked lentils + 250 g cottage cheese + 30 g almonds).
Prefer plant-based foods? See our dedicated vegetarian TDEE & macros guide for a full list of high-protein vegetarian foods and sample meal plans.
How much fat?
Set fat to at least 0.6–1.0 g/kg of bodyweight. Below 0.5 g/kg for an extended period, hormone production (especially testosterone and oestrogen) starts to drop. Fat also makes meals satiating and tasty — important for adherence.
Carbs fill the rest
After locking protein and fat, the remaining calories go to carbs. Active people typically benefit from 3–6 g/kg of carbs to fuel training and recovery. Non-active people can comfortably run lower.
Worked example
Take a 75 kg adult with a 2,400 kcal target:
- Protein: 2.0 × 75 = 150 g → 600 kcal.
- Fat: 0.8 × 75 = 60 g → 540 kcal.
- Carbs: 2,400 − 600 − 540 = 1,260 kcal → 315 g.
That is a balanced split of roughly 25% / 53% / 22% protein/carbs/fat — a perfectly reasonable starting point for almost anyone.
Five popular macro splits
| Style | P/C/F | When to use |
|---|---|---|
| Balanced | 30 / 40 / 30 | Default; works for most people |
| High-protein | 40 / 40 / 20 | Aggressive cuts; muscle retention |
| Moderate | 25 / 50 / 25 | Endurance athletes |
| Low-carb | 30 / 20 / 50 | Insulin resistance, sedentary lifestyle |
| Keto | 25 / 5 / 70 | Specific therapeutic uses |
Common myths
- "Eating fat makes you fat." Eating more calories than you burn makes you fat. Fat is just dense.
- "You can only digest 30 g of protein per meal." False. Your body absorbs all of it; the rate just varies.
- "Carbs after 6pm turn to fat." Calorie balance does not care what time the clock says.
- "Skipping carbs is the only way to lose fat." Most successful diets are not low-carb.
How to track macros without going crazy
- Pick one weekday and one weekend meal you eat often. Measure once.
- Use the same plates and bowls so portions are visual.
- Aim for "close enough" — within ±5–10 g of each macro per day is excellent.
- Track for 8–12 weeks then transition to intuitive eating with weekly weigh-ins.
Start in 30 seconds
Plug your numbers into our free macro calculator and pick a diet style. You'll have grams-per-day for protein, carbs, and fat instantly.