How to build muscle — the nutrition side.
Building muscle requires two things: a consistent training stimulus and the right nutritional environment — enough protein and enough calories. Here is the science, and how to apply it.
Protein target
1.6–2.2 g/kg
Per kg of body weight per day
Calorie surplus
+250–500 kcal
Above TDEE for a lean bulk
Max muscle gain
~1–2 kg/month
For beginners with optimal nutrition
The science of muscle growth
Muscle hypertrophy — the increase in muscle fibre size — occurs in response to two stimuli working together: mechanical stress from resistance training, and a nutritional environment that provides the raw materials for new tissue construction.
Muscle protein synthesis (MPS) is the process by which your body builds new muscle protein from dietary amino acids. For MPS to occur at a meaningful rate, you need two things: sufficient dietary protein (providing the amino acids) and enough total calories (providing the energy to power the process).
A calorie surplus above your TDEE ensures your body is not competing for energy — it can direct resources toward anabolic processes rather than survival. Without a surplus, experienced lifters struggle to gain meaningful muscle; beginners can do so briefly due to high muscle responsiveness, but this window is limited.
Protein is the raw material
Muscle tissue is made of protein. Without adequate dietary protein, MPS cannot occur at the rate needed for hypertrophy regardless of how hard you train. 1.6–2.2 g/kg body weight per day is the evidence-backed range.
Calories fuel the machinery
Building muscle is energetically expensive. A calorie surplus ensures your body has energy available for MPS, cell growth, repair, and supporting hard training sessions. Without surplus energy, muscle gain is very limited.
Training provides the signal
Progressive overload — gradually increasing load, volume, or intensity — is the training signal that tells your muscle cells to grow. Without this stimulus, protein and calories have nowhere to direct the anabolic response.
Recovery completes the process
Muscle is built during rest, not during training. Adequate sleep (7–9 hours) and rest days allow MPS to complete. Chronic training without recovery — or sleeping poorly while eating in a surplus — significantly limits muscle gain.
Protein: the most important muscle-building variable
Of all the nutritional levers you can pull for muscle building, protein intake is the most important and the most commonly under-optimised. Here is what the evidence says about how to maximise its effect.
Total daily protein: 1.6–2.2 g/kg body weight
The research consensus for maximising MPS in trained individuals is 1.6–2.2 g per kg of body weight per day. At 80 kg, that is 128–176 g of protein daily. Higher intakes (up to 2.4–3.1 g/kg) are safe and may help with satiety during a cut, but provide minimal additional muscle-building benefit.
Distribute across 3–5 meals per day
MPS is maximised when protein is consumed in servings of 20–40 g per meal, distributed throughout the day. A single large protein meal is less effective than multiple moderate servings. Aim for protein at breakfast, lunch, dinner, and optionally pre/post-workout.
Prioritise complete protein sources
Complete proteins contain all essential amino acids, particularly leucine — the primary trigger for MPS. Animal sources (meat, fish, eggs, dairy) are complete. Most plant sources are incomplete, but combining sources (rice + beans, tofu + quinoa) or using soy/pea protein supplements provides complete amino acid profiles.
Pre/post-workout protein matters less than daily total
The 'anabolic window' (eating protein immediately after training) is real but smaller than often claimed. What matters most is total daily protein. That said, a protein-containing meal within 1–2 hours of training is a good habit and contributes to your daily total.
Nutrition principles for muscle building
Beyond protein and total calories, the quality of your nutrition environment affects how much muscle you build relative to fat, and how well you perform in training sessions.
Set your calorie surplus at 250–500 kcal above TDEE
This range produces 0.25–0.5 kg of weight gain per week with a good ratio of muscle to fat, assuming adequate protein and consistent training. Larger surpluses gain weight faster but proportionally more fat, requiring longer cut phases later.
Hit your protein target before filling the rest
Structure your nutrition by first hitting your protein target (1.6–2.2 g/kg). Then fill the remaining calorie space with carbohydrates and fats. Carbs are especially important for fuelling heavy training sessions and replenishing muscle glycogen post-workout.
Eat to support training performance
If you are under-eating carbohydrates, your training quality will suffer — and poor training quality limits the muscle-building stimulus. Pre-workout meals (eaten 1–3 hours before training) should be carbohydrate-rich for sustained energy during heavy sets.
Do not neglect micronutrients
Vitamins D and K2 support testosterone and bone health. Zinc supports testosterone production. Magnesium supports sleep quality and recovery. Iron supports oxygen delivery to muscles. A diet rich in whole foods — not just protein powders and macros — covers most micronutrient needs.
Update your targets as your weight increases
As you gain muscle, your TDEE rises and so does your protein requirement (since both are based on body weight). Your daily calorie and protein targets need updating every 4–8 weeks during a bulk to stay aligned with your growing body.
How 2BIB helps you build muscle
Muscle building requires precision — you need enough calories, enough protein, and the right targets as your body changes. 2BIB handles the calculation and keeps the numbers current so you can focus on training.
Personalised protein targets
2BIB calculates your daily protein target from your body weight (1.6–2.2 g/kg) and shows your protein intake in real time alongside your daily calorie total. Never guess whether you have hit your protein goal.
Muscle-building calorie surplus
2BIB calculates your real TDEE and adds your target muscle-building surplus, giving you a precise daily calorie goal that puts you in the right nutritional environment for growth.
Automatic target updates as you grow
As you gain weight and muscle, your TDEE and protein requirements increase. 2BIB automatically updates both targets as your body changes — so your surplus stays accurate and your protein intake stays in the right range.
AI food logging for complete macro visibility
Log every meal with 2BIB's AI food scanner, barcode lookup, or search database. See your protein, carbs, and fat in detail — so you can ensure your surplus is coming from quality nutrition, not just extra calories.
Weight progress vs. bulk milestones
2BIB tracks your weekly weight average against your bulk milestones. Gaining too slowly (possible under-eating) or too fast (excess fat gain)? Adjust your intake based on data, not guesswork.
Build muscle with nutrition targets that adapt as you grow
Enter your metrics once. 2BIB sets your protein and calorie targets for muscle building and keeps them calibrated as your weight increases — so your nutritional environment is always right for growth.
Frequently asked questions
How much protein do I need to build muscle?
Target 1.6–2.2 g of protein per kg of body weight per day. At 80 kg, that is 128–176 g daily. Distribute it across 3–5 meals for the best muscle protein synthesis response throughout the day.
Do I need to be in a calorie surplus to build muscle?
For most people, yes. A moderate surplus of 250–500 calories above your TDEE provides the energy needed for muscle protein synthesis and training. Beginners can build muscle at maintenance briefly, but a surplus is needed for sustained progress.
How fast can you build muscle?
Beginners can gain 1–2 kg of lean muscle per month in their first year with optimal nutrition and training. Intermediate lifters gain 0.5–1 kg per month. Advanced lifters may gain as little as 0.25 kg per month. These are maximums with everything optimised.
What foods are best for building muscle?
High-protein, nutrient-dense foods: chicken, turkey, lean beef, salmon, eggs, Greek yoghurt, cottage cheese, legumes, tofu. Carbohydrates (oats, rice, potatoes) fuel training. Healthy fats (olive oil, avocado, nuts) support hormonal function. Real food first; supplements to fill gaps.
Can you build muscle and lose fat at the same time?
Body recomposition is possible — especially for beginners, those returning from a break, or people with higher body fat. It requires high protein, near-maintenance calories, and consistent training. For experienced lifters, separate bulk and cut phases are more effective.
How does 2BIB help with building muscle?
2BIB calculates your TDEE, adds your muscle-building surplus, and sets your protein targets by body weight. As you gain and your weight increases, your TDEE and protein requirements rise — 2BIB updates both automatically. Log every meal and see your protein and calorie intake in real time against your targets.
The nutrition foundation for serious muscle growth.
2BIB calculates your protein targets and calorie surplus from your real TDEE and updates them as you grow — so your nutrition always matches where you are in your bulk.
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