A diet for muscle gain that holds up to the evidence: calorie surplus, protein targets, bulking without getting fat, and the eating mistakes that stall lifters.
A diet for muscle gain needs two things: a small calorie surplus, about 10–20% above maintenance so you gain roughly 0.25–0.5% of your bodyweight a week, and about 1.6 g of protein per kg of bodyweight a day, spread over three or more meals. Your weekly weight trend, not a formula, tells you whether the surplus is real.
Start about 10–20% above maintenance and adjust based on your weekly average weight. Novice and intermediate lifters can aim to gain roughly 0.25–0.5% of bodyweight a week, and advanced lifters less (Iraki et al., 2019).
| Goal | Calories | Protein | Guide |
|---|---|---|---|
| Gain muscle, limit fat | 10–20% above maintenance | 1.6–2.2 g/kg | how to lean bulk |
| Lose fat, keep muscle | Below maintenance | Higher end or more | building muscle in a deficit |
| Scale won't move | Check the weekly average | Built into every meal | why you're not gaining weight |
Aim for about 1.6 g/kg (0.7 g/lb) a day. A meta-analysis of 49 trials found that gains plateaued around 1.62 g/kg, while 2.2 g/kg (1 g/lb) covers nearly everyone.
For most lifters, yes: it is the one supplement with consistent evidence for more lean mass and strength during training, at 3–5 g a day (ISSN, 2017). The effect is real but modest.
Muscle gain in a calorie deficit is most likely for beginners, people returning after a break and people carrying extra fat. Occasional drinking is unlikely to show up in your progress; heavy drinking is a different story.
If you're eating on target and still not growing, food may not be your bottleneck. Find out whether diet is really what's holding you back LiftDecode's diagnosis checks the training and recovery side too, and ranks what to fix first.
Choose an approach you can repeat: a small calorie surplus, about 1.6 g of protein per kg daily spread over three or more meals, and enough carbohydrate to fuel training. Food choice matters less than hitting those targets week after week.
Enough total calories and enough protein do the most to support muscle growth. Timing, supplements and special macros are details once those two are in place (Morton et al., 2018).
Weigh yourself most mornings and compare weekly averages. If your average isn't rising by roughly 0.25–0.5% of bodyweight a week, you're likely eating at maintenance.
How long does it take for creatine to work? About a week with loading, 3–4 weeks at 3–5 g a day. What you notice first, when muscle shows, and why it may not.
Read the articleCan you build muscle in a calorie deficit? Yes if you are new, returning or carrying fat; rarely if lean and trained. Deficit size, protein and training.
Read the articleHow to lean bulk: eat 5–15% above maintenance, gain 0.25–0.5% of bodyweight a week and hit your protein. Exact numbers for a 170 lb lifter, step by step.
Read the articleHow much protein per meal builds muscle? About 0.4 g per kg, or 30–45 g for most lifters, across three to five meals. Calculate your per-meal target here.
Read the articleCalorie surplus for muscle gain: 5–20% above maintenance by training age, aiming for 0.25–0.5% of bodyweight a week. Check if your surplus is too big or small.
Read the articleDoes alcohol kill gains? Not in small doses. What research shows about drinking, muscle growth, sleep and recovery, and how much is too much.
Read the articleHow much protein to build muscle? About 1.6 g per kg (0.7 g per lb) a day; up to 2.2 g/kg covers nearly everyone. Enter your numbers to check your intake.
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