Macronutrients
Macronutrients are the three nutrients the body needs in large amounts and that supply energy: protein, carbohydrate and fat. Protein and carbohydrate provide about 4 calories per gram, fat about 9. Setting them is how a coach turns a calorie target into an actual eating plan.
Macronutrients: what are they?
Calories decide the direction of bodyweight. Macros decide what the client is made of at the end of it, how they train, and whether they can stick to the plan at all. A coach who only sets calories has set half the plan: the same 2,200 calories can be a diet that preserves muscle and keeps sessions strong, or one that leaves a client flat and losing lean mass.
The three macros and what each one does
Alcohol supplies about 7 calories per gram and is sometimes counted as a fourth, though it has no nutritional role and is usually just budgeted against carbs or fat.
| Macro | Calories per gram | Main role |
|---|---|---|
| Protein | 4 | Supplies amino acids for muscle repair and growth; most satiating per calorie. |
| Carbohydrate | 4 | Primary fuel for higher-intensity training; refills muscle glycogen. |
| Fat | 9 | Hormone production, absorption of fat-soluble vitamins, essential fatty acids. |
How to set them, in order
The usual sequence is protein first, fat second, carbohydrate with what is left. Protein is set from bodyweight and goal. Fat is set to a floor that protects hormonal function and palatability rather than optimised upward. Whatever calories remain go to carbohydrate, which is the lever that flexes with training demand.
This order exists because protein and fat both have hard-ish floors, while carbohydrate is the macro that can move up and down without breaking anything. A client training five times a week and a client walking three times a week can share the same protein and fat targets and differ entirely in carbs.
| Macro | Common starting point | Note |
|---|---|---|
| Protein | Roughly 1.6-2.2 g per kg of bodyweight | Toward the higher end in a deficit, or with a leaner client. |
| Fat | A floor around 0.6-0.8 g per kg | Below that, adherence and hormonal function tend to suffer. |
| Carbohydrate | Remaining calories | The flexible lever; more for high training volume. |
Macros are not the whole picture
Two days can hit identical macros and be nutritionally very different. Micronutrients, fibre and food quality all sit outside a macro split, and a plan that ignores them tends to produce clients who are technically on target and practically miserable, hungry or constipated.
The practical fix is to set a fibre target alongside the macros, build most of the plan from whole foods, and leave a deliberate margin for discretionary food rather than pretending it will not happen. That is the whole idea behind flexible dieting, and it is why the best-adhered plans are usually not the most precise ones.
- Set protein from bodyweight, not as a percentage of calories.
- Treat fat as a floor to protect, not a number to minimise.
- Flex carbohydrate with training volume across the week if it helps.
- Add a fibre target so the macro split does not quietly produce a bad diet.
Where percentages break down
Splits expressed as percentages (40/30/30 and similar) are easy to communicate and quietly wrong at the extremes. A 30 percent protein allocation gives a very different gram figure to a 60 kg client on 1,600 calories than to a 95 kg client on 3,200. The first may be under their needs while the second is well past any useful amount.
Set protein in grams per kilogram, set a fat floor in grams, and only then look at what the percentages happen to be. Percentages are a way to describe a plan after the fact, not a way to build one.
Key takeaways
- Macros are protein, carbohydrate and fat; calories set direction, macros set the outcome.
- Set protein first from bodyweight, then a fat floor, then carbohydrate with the remainder.
- Percentage splits distort at low and high calorie levels; use grams per kilogram.
- Macros ignore fibre, micronutrients and food quality, so set those alongside them.
Frequently asked questions
What is the best macro split?
There is no universal split. Protein set from bodyweight, a fat floor that keeps hormones and adherence intact, and carbohydrate filling the rest will fit most clients. From there, the split shifts with training volume, food preferences and whether the client is in a deficit or a surplus.
Do macros matter more than total calories?
Calories decide whether weight moves up or down. Macros decide the composition of that change and how the client feels while it happens. In practice you need both: hitting macros almost always means hitting calories, which is one reason coaches prescribe macros rather than calories alone.
Does a client have to track every gram?
No, and for many clients it is counterproductive. A common progression is to track protein and total calories only, then add carbs and fats once the habit is established. Some clients do better with portion-based guidance and a meal plan they follow rather than any numbers at all.
Updated August 28, 2026
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