The Question Everyone Gets Wrong
Ask ten people at the gym how much protein you need to build muscle and you'll get ten different answers. Some will say 1 gram per pound of bodyweight. Others will say 2 grams. A few will mention something about leucine thresholds or protein timing windows. Almost none of them will cite a study.
The good news: there's actually solid research on this. The answer isn't a magic number — it's a range, and you're probably overthinking it.
What the Research Says
The most cited review on protein and muscle growth — a 2018 meta-analysis published in the *British Journal of Sports Medicine* that pooled data from 49 studies — found that protein intakes beyond 1.62g per kilogram of bodyweight per day (about 0.73g per pound) produced no additional muscle gain.
That's the ceiling. Most people don't need more than that.
For practical purposes, a target of 1.6–2.2g of protein per kilogram of bodyweight per day covers nearly everyone, accounts for individual variation, and gives you a buffer. If you weigh 80kg (176 lbs), that's 128–176g of protein per day.
The low end of this range is enough to maximise muscle protein synthesis for most people. The upper end is useful if you're in a calorie deficit (cutting), are more advanced, or want extra flexibility in meal timing.
Why the "1 Gram Per Pound" Rule Exists
The "1g per pound" rule is an American gym bro heuristic that's been passed down for decades. In metric terms it works out to about 2.2g per kilogram — near the top of the evidence-based range, but not catastrophically wrong.
The reason it persists: it's simple, memorable, and errs on the side of more rather than less. For most recreational lifters, it works fine even if it's slightly higher than necessary.
The real problem is when people take it as gospel and panic if they hit 150g instead of 180g. At that point, the rule is causing more stress than muscle.
Does Protein Timing Matter?
The old advice was to chug a shake within 30 minutes of training or your gains would evaporate. This was overblown.
What does matter is spreading protein intake across the day. Research suggests that muscle protein synthesis is maximised when you consume roughly 20–40g of high-quality protein per meal, multiple times a day — rather than eating 150g in one sitting.
The body can only process so much protein for muscle-building purposes at once. If you eat 200g of protein in two massive meals, a large portion of the excess gets oxidised for energy. If you spread the same 200g across four or five meals, you're more likely to be in a continuous anabolic state throughout the day.
For practical purposes: hit your daily total and aim for at least 3 protein-containing meals. That's enough to get 90% of the timing benefit without obsessing over meal schedules.
Protein Quality: Not All Sources Are Equal
Protein quality is determined by its amino acid profile — specifically its leucine content and digestibility. Leucine is the key amino acid that triggers muscle protein synthesis.
Highest quality sources:
- Chicken, turkey, beef
- Fish and seafood
- Eggs and egg whites
- Dairy (Greek yoghurt, cottage cheese, milk)
- Whey protein
Good but slightly lower quality:
- Legumes (beans, lentils, chickpeas)
- Tofu and tempeh
- Edamame
Lower quality (but still useful):
- Bread, pasta, rice — these contain some protein but limited leucine
If you eat mostly animal protein, don't stress about quality — you're covered. If you're plant-based, you need to be more intentional about variety and volume to ensure you're getting all essential amino acids and enough leucine per meal.
What About Protein Supplements?
Whey protein isn't magic. It's just a convenient, fast-digesting source of high-quality protein. If you're consistently hitting your daily target through whole foods, you don't need it.
Where supplements genuinely help:
- You're struggling to hit your protein target through food alone
- You need a quick, easy post-workout option
- You're travelling or in situations where food quality is hard to control
One scoop of whey protein (typically 25–30g) is the equivalent of a large chicken breast, calorie for calorie and protein for protein. It's a tool, not a requirement.
Creatine — a separate supplement — has the most evidence for performance enhancement. But that's a different conversation.
Practical Targets by Bodyweight
Here are simple daily protein targets based on the 1.6–2.2g/kg range:
| Bodyweight | Minimum (1.6g/kg) | Upper (2.2g/kg) |
|------------|-------------------|-----------------|
| 60kg / 132 lbs | 96g | 132g |
| 70kg / 154 lbs | 112g | 154g |
| 80kg / 176 lbs | 128g | 176g |
| 90kg / 198 lbs | 144g | 198g |
| 100kg / 220 lbs | 160g | 220g |
Aim for somewhere in this range. You don't need to hit a precise number every day — weekly averages matter more than daily perfection.
The Practical Priority Order
If you're trying to get your nutrition dialled in for muscle building, here's how to prioritise:
- Total calories — you can't build muscle in a significant calorie deficit (small surpluses or maintenance works; large deficits don't)
- Total protein — hit 1.6–2.2g/kg per day, spread across meals
- Meal timing — aim for at least 3 protein-containing meals
- Everything else — carbs, fats, meal timing precision
Most people get lost arguing about #3 and #4 before they've nailed #1 and #2. Fix the big things first.
How Soma Helps You Hit Your Target
Tracking protein manually is tedious. Looking up every food, estimating portion sizes, logging each meal — it adds friction, and friction kills consistency.
Soma's photo calorie tracking lets you log a meal by pointing your camera at it. The AI identifies the foods, estimates portions, and calculates protein (and all macros) automatically. You see where you are against your daily target at a glance — no manual entry required.
Over time, Soma also learns your eating patterns. If you're consistently falling short on protein in the evening, it can flag it. If you've nailed your target three days running, you'll see that too.
Protein targets are simple in theory. Hitting them every day is where most people struggle. The right tool removes the friction.
Download Soma free on the App Store and start tracking your protein with a photo.