Setting macros, and which one to fix first
Why protein is set first and carbohydrate last, what the diet templates actually change, and how much of this matters against simply hitting the calorie target.
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In short
- Set protein first, fat second, and let carbohydrate take whatever calories remain. That order reflects how much each one is constrained.
- At 75 kg cutting, the target is 2,068 calories with 150 g of protein, 220 g of carbohydrate and 65 g of fat.
- Changing the diet template moves carbohydrate and fat and leaves protein and calories untouched. Keto takes carbs to 24 g and fat to 152 g.
- Calories decide whether weight changes. Protein decides whether the change is fat or muscle. Everything else is preference.
- Protein has 4 calories per gram, carbohydrate 4, fat 9, and alcohol 7.
Macronutrients are the three components of food that supply energy — protein, carbohydrate and fat — plus alcohol, which supplies energy and nothing else.
| Macronutrient | Calories per gram |
|---|---|
| Protein | 4 |
| Carbohydrate | 4 |
| Fat | 9 |
| Alcohol | 7 |
Setting macros means dividing a calorie target between them, and the order in which you do it is what makes the result sensible.
The order: protein, fat, then carbohydrate
Protein first, because it is the one with a real physiological requirement that changes the outcome. In a deficit it determines whether the weight lost is fat or muscle, and there is no substitute for hitting it.
Fat second, at a floor rather than a target. Below roughly 0.6 g per kilogram of body weight, hormone production suffers. Above the floor it is a preference.
In order, with calories at 4 per gram for protein and carbohydrate and 9 for fat:
calories = TDEE × 0.8 cutting, × 1.1 bulking, × 1 maintaining.
protein(g) = weight(kg) × 2.0 cutting, × 1.8 bulking, × 1.4 maintaining.
fat(g) = (calories − protein(g) × 4) × fat share ÷ 9, where the fat share is the template's fat percentage over its fat plus carbohydrate percentages.
carbohydrate(g) = (calories − protein(g) × 4 − fat(g) × 9) ÷ 4 — whatever the first two leave.
Carbohydrate last, taking whatever calories remain. It has no minimum requirement — the body can make glucose from protein and fat — and it is the most flexible of the three.
For a 75 kg person cutting at 2,068 calories:
| Macro | Grams | Calories | Share |
|---|---|---|---|
| Protein | 150 g | 600 | 29% |
| Carbohydrate | 220 g | 880 | 43% |
| Fat | 65 g | 585 | 28% |
Two grams of protein per kilogram, fat comfortably above the floor, and carbohydrate absorbing the remainder.
Goals change the calories, not the protein
Across goals at the same body weight:
| Goal | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Cut | 2,068 | 150 g | 220 g | 65 g |
| Maintain | 2,585 | 105 g | 325 g | 96 g |
| Bulk | 2,843 | 135 g | 345 g | 102 g |
Protein is highest when cutting, which is the opposite of what most people assume. A deficit is when muscle is at risk, so protein requirements rise even as total calories fall. In a surplus the surplus itself protects muscle, and the requirement is lower.
Carbohydrate absorbs most of the change between goals, which is what makes it the flexible one.
What the diet templates do
Selecting a template redistributes carbohydrate and fat. It does not change the calories and it does not change the protein.
At 2,068 calories with 150 g of protein:
| Template | Carbs | Fat |
|---|---|---|
| Balanced | 220 g (43%) | 65 g (28%) |
| Lower carb | 131 g (25%) | 105 g (46%) |
| Keto | 24 g (5%) | 152 g (66%) |
Every row has the same calories and the same protein. The evidence on which produces more fat loss, calories and protein held equal, is that they are broadly equivalent — the differences reported in short studies mostly reflect water weight, since each gram of glycogen holds about three grams of water.
Choose the template you can adhere to. That is not a consolation; adherence is the variable that actually predicts outcomes, and it varies enormously between people and cuisines. An Indian diet built around roti, rice and dal makes a very low carbohydrate template genuinely difficult, and difficulty is what ends plans.
What each macro does
Protein. Builds and repairs tissue, makes enzymes and hormones. Highest thermic effect — 20% to 30% of its calories are spent digesting it — and the most satiating per calorie. In a deficit, 1.6 to 2.2 g per kilogram.
Fat. Hormone production, absorption of vitamins A, D, E and K, cell membranes. Floor of 0.6 g per kilogram, ideally including sources of omega-3. Saturated fat is worth moderating; trans fats are worth avoiding entirely.
Carbohydrate. The preferred fuel for high-intensity work and for the brain. Fibre, which is a carbohydrate, matters independently — 25 to 30 g a day, and most people fall well short. Whole grains, pulses, fruit and vegetables over refined sources, for fibre and micronutrients rather than for the macro itself.
Fibre and the micronutrients
Macros are an energy accounting exercise. They say nothing about whether the food is any good.
Two diets with identical macros — one of chicken, rice, dal and vegetables, the other of protein bars, white bread and oil — differ enormously in fibre, vitamins, minerals and how full they leave you. The calculator cannot see this and neither can a tracking app's macro summary.
Fibre is the most commonly missed. The Indian diet is well positioned for it — dal, chana, rajma, whole wheat, vegetables — and refining it away is what causes the shortfall.
The practical rule: hit the macros with whole foods and the micronutrients largely take care of themselves. Hit them with engineered products and they do not.
How precise does this need to be?
Less than tracking apps imply.
Calories are the variable that decides whether weight moves. Being within 100 or so of the target consistently is enough.
Protein is worth hitting within about 10 g, because the effect on body composition is real.
Carbohydrate and fat can vary considerably day to day with no consequence, provided the calories and protein land. Chasing an exact split each day is precision the underlying science does not support.
Weekly totals matter more than daily ones. A high day balanced by a low one produces the same result as two average days.
Someone new to this is better served by tracking calories and protein alone for the first month and adding the other two later, if at all.
Alcohol
Seven calories a gram, no nutritional contribution, and it suppresses fat oxidation while it is being metabolised because the body prioritises clearing it.
Three drinks is roughly 400 to 500 calories — most of a modest daily deficit, and calories that come with no satiety and usually with food alongside.
It is not necessary to eliminate it. It is necessary to count it, and most tracking omits it entirely.
Meal distribution, and how much it matters
The daily total dominates. Within it, a workable shape is three or four meals each carrying 25 to 40 g of protein, which is roughly the amount that maximally stimulates muscle protein synthesis in one sitting.
Beyond that, the evidence for specific timing is thin.
Meal frequency does not change metabolic rate. The claim that six small meals "keep the metabolism going" confuses the thermic effect of food, which depends on how much you eat rather than how often. Three meals and six meals with the same totals produce the same result.
Carbohydrate timing matters for performance rather than composition. Eating carbohydrate before and after hard training supports the session and refills glycogen; eating it in the evening does not cause fat gain, despite the persistence of that belief.
Intermittent fasting works when it works because it reduces total intake, not because of the timing itself. Studies matching calories and protein between fasting and normal eating patterns find no difference in fat loss. It is an adherence tool, and a good one for people who prefer fewer, larger meals.
Adjusting the numbers over time
Macros are a hypothesis. Your own results test it.
Hold the targets for two to three weeks, then compare the seven-day average weight to what was predicted. If loss exceeds about 1% of body weight a week, add 100 to 200 calories — mostly carbohydrate. If nothing has moved with accurate tracking, cut by 10%.
Recalculate the whole thing every 5 kg, because a lighter body needs fewer calories and the protein target moves with weight too.
The one number that should not drift downward is protein. Everything else is adjustable.
What this calculator assumes
- Calories from Mifflin-St Jeor BMR multiplied by an activity factor, adjusted for the goal you select.
- Protein set per kilogram of body weight according to the goal; at high body fat, lean mass is the better basis.
- Fat set by the template, with a floor to protect hormone function, and carbohydrate taking the remainder.
- Four calories per gram for protein and carbohydrate, nine for fat.
- Estimates carry roughly ±200 calories of individual variation. Adjust from your own results after two to three weeks.