TL;DR
- Target 1.6 g/kg body mass per day as a lifter.[1]
- Distribute across 3–5 meals at 30–40 g each to comfortably clear the leucine threshold per meal.[5]
- The “30 g ceiling per meal” claim is wrong. Larger doses are used, just over a longer window.[3]
- Protein is the macronutrient most often under-hit. Most people estimate their intake 20–30% high.
Eating enough protein is an operational problem, not an evidence problem. The targets are clear; hitting them consistently is where people fall short. This article is the practical how-to: what to eat, when, and how to know you're actually hitting the number.
The target
Morton's 2018 meta-analysis[1] identified 1.6 g/kg body mass per day as the point at which additional protein stops producing more lean mass in lifters, with a 95% CI upper bound of 2.2 g/kg. For an 80-kg lifter, that's 128 g of protein per day. For a 60-kg lifter, 96 g/day.
Two adjustments:
- Cutting: Push to 2.3–3.1 g/kg of fat-free mass during aggressive deficits to preserve muscle.[2]
- Older adults (50+): 1.8–2.0 g/kg body mass compensates for the attenuated protein-synthesis response.
The Protein Intake Calculator applies these rules and returns a daily number plus a per-meal distribution suggestion.
Per-meal distribution
The classical guidance[2] is 3–5 meals of 0.4 g/kg each (roughly 25–40 g per feeding for most adults), spaced 3–5 hours apart. This reliably clears the leucine threshold of ~2.5–3 g of leucine per meal[5] with animal-source proteins.
Macnaughton 2016[3] showed that 40 g doses produced larger whole-body MPS than 20 g doses post-workout, nudging the practical per-meal ceiling upward. Later work has pushed it higher still; the idea that protein above 30 g is “wasted” has not survived the 2020s literature.
For practical purposes: 30–40 g per feeding is still the cleanest target. If your lifestyle pushes you to 1–2 meals with 60+ g each, you're not sacrificing outcomes that we can reliably detect.
Protein per 100 g of whole foods
Food (100 g cooked) Protein (g) Leucine (g)
─────────────────────────────────────────────────────────
Chicken breast 31 2.5
Beef, lean sirloin 29 2.3
Salmon 25 2.1
Turkey breast 29 2.3
Canned tuna 26 2.1
Greek yogurt (non-fat) 10 0.9
Cottage cheese (2%) 12 1.1
Eggs (large, one egg = 50 g) 6 0.5
Whey isolate (per scoop, 25 g) 22 2.5
Tempeh 20 1.5
Lentils, cooked 9 0.7
Tofu, firm 10 0.8
Pea protein (per scoop, 25 g) 21 1.7A useful mental calibration: a palm-sized portion of cooked lean meat or fish is roughly 25–35 g of protein. Four palm-sized portions per day = ~120 g protein, which is the target for most intermediate lifters.
Four practical eating patterns
The classic four-meal day
Breakfast Greek yogurt 200 g + oats + whey 25 g 45 g
Lunch Chicken 150 g + rice + veg 45 g
Snack Cottage cheese 150 g + fruit 22 g
Dinner Salmon 150 g + potatoes + salad 38 g
Total 150 gThree-meal day (no snack)
Breakfast 4-egg omelette + cheese + ham 45 g
Lunch Turkey 180 g + rice + veg 55 g
Dinner Beef 180 g + sweet potato + salad 55 g
Total 155 gIntermittent fasting (16:8, two meals)
First meal Chicken salad 250 g + beans + rice 65 g
Second meal Salmon 200 g + pasta + veg 55 g
Pre-sleep Whey 25 g + Greek yogurt 200 g 40 g
Total 160 gVegan day
Breakfast Tofu scramble 200 g + oats + pea protein 25 g 45 g
Lunch Tempeh 150 g + quinoa + veg 45 g
Snack Pea protein shake 40 g 34 g
Dinner Lentils 200 g + rice + mixed nuts 28 g
Total 152 gTiming around training
Schoenfeld's 2013 meta-analysis on post-workout protein timing[2] found no magical anabolic window. What's defensible:
- Consume a protein-containing meal within 2–4 hours on either side of training.
- If you trained fasted, get 25–40 g of fast-absorbing protein (whey, dairy) within ~1 hour after.
- If you trained after a meal, you've already covered it. The 4-hour mark post-training is a comfortable window for the next feeding.
The “shake in the car on the way home or your gains evaporate” framing has no meta-analytic support.
Distributing protein for 3-meal vs 4-meal vs 5-meal days
Practical distribution variations for a 160 g/day target:
Pattern Meal 1 Meal 2 Meal 3 Meal 4 Meal 5
────────────────────────────────────────────────────────────────
5 meals × 32 g 32 32 32 32 32
4 meals × 40 g 40 40 40 40 —
3 meals × 53 g 53 53 54 — —
2 meals (IF) 80 80 — — —
1 meal (OMAD) 160 — — — —All of these patterns can deliver adequate MPS stimulation across the day with enough protein. The five-meal pattern is the most conservatively distributed; the one-meal pattern pushes the physiological limits of per-meal anabolic response[3] but evidence from Trommelen et al. 2023[3] suggests it's more defensible than previously assumed.
Protein on training vs rest days
Should you eat more protein on training days? Small effect, probably not worth engineering around. Morton's 2018 meta-regression[1] was based on average daily intake across both training and rest days. The convenient default: hit the same daily target every day. If you strongly prefer to vary by day, cycling ±15–20% across training and rest days is defensible but not evidence-backed as superior.
Collagen and specific supplements
Collagen peptides (marketed for joint support) have lower leucine content than whey or meat and don't substitute for high-quality protein. If you consume collagen for other reasons (joint, skin), count it separately from your protein total rather than toward it.
BCAAs and EAAs (essential amino acids) deliver leucine but not complete protein. Research on EAA supplementation independent of dietary protein is mixed; for lifters eating adequate daily protein, marginal benefit is unclear.
Tracking accurately
The single largest error in self-reported protein is overestimation. Common mistakes:
- Raw vs cooked weights. 150 g raw chicken becomes ~110 g cooked. Manufacturers' labels are raw.
- Package size vs actual serving. The shake bottle that says “serves 1” has one scoop; the protein stated is for one scoop. Two scoops = two servings of protein, not one.
- “High protein” marketed foods. High-protein bread is usually 8–10 g per slice, not a meal's worth.
- Unlogged add-ons. Cheese melted on vegetables, butter in the pan, handful of nuts — small protein hits that don't make the log.
One week of weighed tracking per year re-calibrates your estimates. After that, eyeballing is usually within 15%.
Safety and high intake
There is no lean-mass benefit documented above 2.2 g/kg body mass in Morton's dataset. More is wasted as energy, not harmful.
Summary
- Target 1.6 g/kg/day as a lifter, 2.3–3.1 g/kg FFM in a cut.
- Split across 3–5 meals of 30–40 g each.
- Leucine threshold per meal is the gate — animal sources clear it easily, plant sources may need larger doses.
- Track weighed for one week per year; eyeball the rest.
- Post-workout window is wider than you were told in 2005.
Worked example: hitting 170 g across a busy day
An 85-kg intermediate lifter targeting 2.0 g/kg during a building phase = 170 g daily protein. Busy work schedule, one training session at 6pm, one leucine-deficient vegetable-heavy lunch at a work cafeteria. Plan the day to hit the number.
Time Food Protein (g) Leucine (g)
────────────────────────────────────────────────────────────────────────
07:00 Greek yogurt 250 g + oats + whey 25g 47 g 3.7 g ✓
12:30 Chickpea salad + grilled chicken 100g 26 g 2.0 g ✓
15:30 Cottage cheese 200 g + almonds 28 g 2.2 g ✓
18:30 Training (fasted-adjacent OK)
19:00 Whey 30 g + banana post-lift 27 g 2.7 g ✓
21:00 Beef sirloin 150 g + rice + veg 44 g 3.5 g ✓
Total 172 g 14.1 gFive feedings, all crossing the leucine threshold (~2.5 g/feeding per Wolfe 2019[5]), daily total within 2 g of the 170 g target. The 15:30 snack is the structural fix — without it, the 6.5-hour gap between lunch and dinner + post-workout shake means only four feedings fit the day, and the lifter routinely under-hits by ~25 g because one of the remaining meals has to carry 55+ g. Snack insertions scale the whole day's protein easily.
Common failure modes
- Raw/cooked weight confusion. "150 g chicken breast" on a food label is typically raw; 150 g raw cooks to ~110 g, which contains ~33 g protein not the ~47 g the package-calculator shows. A recreational tracker off by this much on 4 chicken meals a week systematically under-eats 50–70 g protein/week.
- Counting collagen toward the daily total. Collagen peptides have low leucine content (~0.9 g leucine per 10 g collagen vs ~2.5 g leucine per 25 g whey) and don't support muscle protein synthesis comparably. Collagen has legitimate joint/skin uses but should be counted separately.
- Treating BCAAs as protein. 10 g BCAAs is ~10 g of amino acids, not 10 g of functional protein — absent complete EAAs, the MPS response is blunted. For lifters eating 1.6+ g/kg daily, BCAA supplementation adds nothing that's visible in outcomes.
- Over-relying on "high protein" marketed snacks. High-protein bread at 8 g/slice is not a protein source at the scale a lifter needs. Reading the nutrition panel reveals 200-kcal snacks with 8–12 g protein dressed up as primary protein sources.
- Protein stopping at breakfast in a cut. An IF 16:8 cutter who hits 60 g at 12pm and 40 g at 5pm is at 100 g — well below the cut-phase 2.3–3.1 g/kg FFM target[2] for most lifters. Add a third 30–40 g dose at the break or pre-sleep to close the gap without changing calories.
Connects to
- Protein for Lifters: The 2026 Meta-Analyses — deeper on the dose-response literature.
- How to Count Macros — fitting protein into the broader macro plan.
- TDEE for Athletes — calibrating the calorie scaffold protein sits inside.
References
- 1 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 — British Journal of Sports Medicine (Morton et al.) (2018)
- 2 International Society of Sports Nutrition position stand: protein and exercise — Journal of the International Society of Sports Nutrition (2017)
- 3 The response of muscle protein synthesis following whole-body resistance exercise is greater following 40 g than 20 g of ingested whey protein — Physiological Reports (Macnaughton et al.) (2016)
- 4 Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids — Institute of Medicine (2005)
- 5 Leucine threshold and anabolic signalling in skeletal muscle — Nutrients (Wolfe et al.) (2019)