How much protein do I need for muscle building?

1.6–2.2 g protein per kg bodyweight per day. Above 1.6 g/kg, muscle growth improves substantially, but no additional benefit is measurable above 2.2 g/kg.

Do I need a calorie surplus to build muscle?

A moderate surplus of 200–500 kcal/day is optimal for muscle building — 10–20% above maintenance. Beginners can also build muscle in a slight deficit (body recomposition).

Which supplements are actually useful for muscle building?

Only a few supplements have strong scientific evidence: Creatine monohydrate (3–5 g/day) has the strongest backing. Caffeine improves training performance. Most other supplements — including BCAAs and testosterone boosters — lack convincing evidence.

How important is meal timing for muscle building?

Less important than often claimed. Total daily protein intake matters more than exact timing. However, distributing protein evenly across 3–5 meals can optimize muscle protein synthesis.

Nutrition for Muscle Growth: What Research Actually Says

You train hard, sleep enough — but nutrition? “Eat more protein” is everywhere. But how much is enough? Do you need a caloric surplus? And what about supplements?

Here’s what research actually shows — no supplement bias, no marketing.

Calories: Surplus vs. Recomposition

Building muscle requires energy. But how much?

Caloric surplus: 200-500 kcal above your maintenance. This is the fastest way to build muscle mass. The downside: you’ll also gain some fat. A moderate surplus of ~300 kcal minimizes fat gain while maximizing muscle growth.

Recomposition: Building muscle while losing fat — possible, but slower. Works best for:

Beginners (first 6-12 months)
Overweight lifters
Returning lifters after a training break

What this means: If you’re already lean and want maximum muscle growth, eat in a slight surplus. If you want to lose fat simultaneously and aren’t advanced yet, recomposition works — it just takes longer. One underrated lever for energy balance: daily step count and NEAT can account for several hundred additional calories burned per day without any formal cardio.

Protein: 1.6-2.2g/kg Is Enough

This is the most important number in sports nutrition. The largest meta-analysis on the topic evaluated 49 studies with 1,863 participants and reached a clear conclusion:

1.6g protein per kilogram of bodyweight per day is the point where more protein provides no additional muscle growth. The upper limit with safety margin: 2.2g/kg.

Bodyweight	Minimum (1.6g/kg)	Optimal (2.0g/kg)	Upper limit (2.2g/kg)
60 kg / 132 lbs	96g	120g	132g
70 kg / 154 lbs	112g	140g	154g
80 kg / 176 lbs	128g	160g	176g
90 kg / 198 lbs	144g	180g	198g
100 kg / 220 lbs	160g	200g	220g

Why do you hear “3g/kg” everywhere? Because supplement companies sell protein powder. More protein = more powder = more revenue. Research says: 1.6g is sufficient, 2.2g is the upper bound with buffer.

→ Protein needs in detail: Why 1.6g/kg is enough

Protein Timing: Less Important Than Total Amount

“Anabolic window”, “30 minutes post-workout” — timing is far less important than total daily intake.

What’s true:

Total daily protein intake is the most important factor
3-5 meals with ~0.4g/kg protein each is a good framework
A meal within ~2 hours after training is sensible (but not mandatory)

What’s exaggerated:

The “anabolic window” of 30 minutes is a myth
It doesn’t matter whether you drink your shake in the gym or 2 hours later
Casein before sleep has a minimally measurable effect — but not one you’ll see in the mirror

Practical takeaway: Eat protein regularly throughout the day. 3-4 meals with 30-40g protein each is a simple system. More complexity provides no measurable advantage.

Carbohydrates: Training Fuel, Not Optional

Carbs have a bad reputation in the fitness world — undeservedly. For strength training, they’re essential:

Glycogen is the primary energy store for high-intensity training. Without sufficient carbs, your training performance suffers — and with it, your muscle growth.

Recommendation: 3-6g carbohydrates per kilogram per day, depending on training volume.

Training volume	Carbs/kg
3 days/week, moderate	3-4g/kg
4-5 days/week, intense	4-5g/kg
6+ days, very high volume	5-6g/kg

Sources: Rice, potatoes, oats, whole grain bread, fruit. The exact source matters less than the amount.

Fat: Minimum for Hormones

Fat isn’t the enemy — but you need less than you think. Minimum: 0.8-1g per kilogram bodyweight.

Why a minimum? Fat is essential for hormone production (testosterone, estrogen). Too little fat = poor hormone levels = worse recovery and muscle growth.

Practically: At 80kg bodyweight, that’s 64-80g fat per day. You get that from:

2 eggs, some olive oil, a handful of nuts, fatty fish 2x/week

Fat is the most flexible macronutrient — as long as you meet the minimum, the rest doesn’t matter much.

Supplements: What Works and What Doesn’t

Here’s the honest truth:

Works (strong evidence)

Creatine Monohydrate: The most well-researched supplement ever. 3-5g daily, ongoing. Increases strength by ~5-10%, slightly accelerates muscle growth. Safe, cheap, no loading phase necessary. For the full deep-dive with all the studies and myths debunked: Creatine for Strength Training — What 500+ Studies Show.

Caffeine: 3-6mg/kg bodyweight 30-60 minutes before training. Improves strength, endurance, and focus. Caution: tolerance builds up.

Protein Powder: Not a magic supplement — it’s just protein. Useful if you struggle to meet your daily needs through regular food. Whey, casein, plant-based — the source barely matters.

Probably doesn’t work

BCAAs: If you eat enough protein, BCAAs are redundant. Money better spent on real food
Testosterone Boosters: No study shows a relevant effect. Save your money
Fat Burners: The effect is minimal (30-50 kcal/day). Unnecessary stimulants
Glutamine: No effect on muscle growth in healthy people with adequate protein

Unnecessary but not harmful

Multivitamin: Useful with a restricted diet, but no performance booster
Omega-3: Good for general health, but no direct muscle-building effect
Vitamin D: Useful in winter in Northern Europe (deficiency is common), but not a training booster

Practical Nutrition Framework

No recipes, just a system:

Step 1: Calculate your calorie needs (maintenance + 300 kcal for building, or maintenance - 300 kcal for fat loss).

Step 2: Set protein: 2g/kg bodyweight.

Step 3: Set fat: 1g/kg bodyweight.

Step 4: The rest goes to carbohydrates.

Example for 80kg, muscle building:

Calories: ~2800 kcal (2500 maintenance + 300)
Protein: 160g (640 kcal)
Fat: 80g (720 kcal)
Carbohydrates: 360g (1440 kcal)

You don’t need to hit these numbers exactly. ±10% deviation is irrelevant. Consistency over weeks matters more than perfection on any single day.

Transparency: hitPR Is Not a Nutrition App

hitPR tracks your training, not your food. There are no nutrition features and none are planned. Why? Because there are enough good nutrition apps (MyFitnessPal, Cronometer, YAZIO) and hitPR focuses on what it does well: tracking your training, automating progression, detecting PRs.

This article exists because nutrition is part of the puzzle — but training is my expertise.

Bottom Line

Muscle-building nutrition is less complicated than the supplement industry wants you to believe:

Calories: Slight surplus (+300) or recomposition
Protein: 1.6-2.2g/kg, spread across 3-4 meals
Carbohydrates: 3-6g/kg, adjusted to training volume
Fat: Minimum 0.8-1g/kg
Supplements: Creatine (yes), caffeine (optional), the rest is marketing

Train hard, eat enough protein, sleep well. That’s 90% of the result. If you want to understand the recovery side in more detail: Recovery in Strength Training — What the Research Says.

Further reading:

Sources

Morton RW et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med, 52(6):376-384.
Iraki J et al. (2019). Nutrition Recommendations for Bodybuilders in the Off-Season. J Int Soc Sports Nutr, 16(1):12.
Kerksick CM et al. (2017). ISSN exercise & sports nutrition review update: research & recommendations. J Int Soc Sports Nutr, 14:38.
Kreider RB et al. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation. J Int Soc Sports Nutr, 14:18.
Schoenfeld BJ & Aragon AA (2018). How much protein can the body use in a single meal for muscle-building? J Int Soc Sports Nutr, 15:10.
Murray B & Rosenbloom C (2018). Fundamentals of glycogen metabolism for coaches and athletes. Nutr Rev, 76(4):243-259.

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