Protein advice on the internet exists on two extremes: not enough to do anything useful, or so much that it becomes an obsession. The reality is straightforward, evidence-based, and far less complicated than most people have been led to believe.
This article covers the actual science of protein requirements for people who train, and gives you a number you can use.
Why protein matters for anyone who trains
Muscle tissue is broken down during training and rebuilt during recovery. Protein provides the raw material for that rebuilding process, specifically the amino acids that form the structural components of muscle fibres.
Without adequate protein, the recovery process is incomplete. You can train consistently, apply progressive overload, sleep well, and still fail to build muscle or maintain strength if protein intake is chronically insufficient.
Protein also plays a role in satiety. Gram for gram, protein is more filling than carbohydrate or fat, which matters practically for people managing their calorie intake.
What the research actually says
The most commonly cited recommendation in sports science literature sits between 1.6g and 2.2g of protein per kilogram of bodyweight per day for people engaged in resistance training.
The lower end (1.6g/kg) is sufficient for most trained individuals in a moderate calorie balance. The upper end (2.2g/kg) is relevant in two scenarios: when training volume is very high, or when eating in a calorie deficit, where additional protein helps preserve muscle mass.
A practical starting point: 2g of protein per kilogram of bodyweight per day. For an 80kg person, that is 160g of protein daily.
Going significantly above 2.2g/kg produces no additional muscle-building benefit for most people. It is not harmful, but it replaces calories that could be used for carbohydrate or fat, both of which support training performance and general health.
Does protein timing matter?
Protein timing (specifically the idea of a "anabolic window" immediately after training) is far less important than total daily protein intake. Multiple studies have shown that muscle protein synthesis is elevated for many hours post-training, not just the immediate 30-minute window that was popularised in earlier sports nutrition literature.
What does matter:
- Distributing protein across 3–4 meals or eating occasions rather than consuming it all in one or two large meals
- Including protein in the meal closest to your training session (either pre or post)
- Ensuring your last meal of the day contains adequate protein to support overnight recovery
If you hit your daily total, timing becomes a secondary optimisation, not a primary concern.
Protein quality and sources
Not all protein sources contain all essential amino acids in the proportions the body needs for muscle protein synthesis. Animal sources (meat, fish, eggs, dairy) are complete proteins, plant sources vary.
For people eating animal products, hitting a protein target with varied sources is straightforward. For those eating primarily plant-based diets, the key is combining sources across the day (legumes with grains, for example) and potentially targeting slightly higher total protein to account for lower digestibility of some plant proteins.
Practical high-protein foods
- Chicken breast: ~31g protein per 100g
- Greek yoghurt (0%): ~10g per 100g
- Eggs: ~13g per 100g (roughly 6g per egg)
- Canned tuna: ~25g per 100g
- Cottage cheese: ~11g per 100g
- Tempeh: ~19g per 100g
- Lentils (cooked): ~9g per 100g
What about protein supplements?
Protein supplements (whey, casein, plant-based blends) are not necessary, they are convenient. If you can hit your protein target through whole food sources, supplements add nothing except cost.
Where supplements become useful: when food protein is inconvenient (travel, early morning training), or when appetite limits your ability to consume enough protein from food alone.
Whey protein is the most studied and cost-effective option for most people. Casein digests more slowly and may be useful before sleep. Plant-based blends (pea + rice) perform comparably to whey in most research when consumed in equivalent amounts.
A simple daily protein framework
Calculate your target: bodyweight in kg × 2 = daily protein target in grams.
Distribute across meals: divide your target by 3–4 to find your per-meal minimum.
Prioritise whole food sources: supplements fill gaps, not foundations.
Track for two weeks: most people are surprised by how far above or below their target they actually land when tracking honestly. Awareness precedes change.
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