How much protein you actually need

Most people chase a protein number without knowing why that number exists or when it changes. The honest answer is simpler than the supplement ads make it sound, and it depends a lot on whether you're gaining, losing or holding steady.

The number that matters most

When you're eating at maintenance or in a surplus to build muscle, the evidence points to a ceiling. A large review of trials found protein intake was shown to promote additional gains in lean body mass beyond resistance exercise alone, but beyond a daily intake of 1.6 g/kg body mass per day, the extra benefit mostly disappears. Push it to 2.2 g/kg if you like a buffer, but more than that is unlikely to build extra muscle, even though it won't harm you either.

To put that in everyday terms, someone who weighs 75kg is looking at roughly 120 to 170 grams of protein a day. That's a big range on purpose. Your appetite, your budget and how much you enjoy meat, dairy, eggs, beans or protein powder all decide where in that range you land.

Why cutting changes the math

Protein does a different job when you're eating less than you burn. One narrative review notes that during deficits, as in weight-class sports, physique preparation, or injury recovery, protein requirements rise to protect lean mass, with some researchers suggesting 2.3 to 3.1 g per kg of fat-free mass during a cut, compared with around 1.6 g/kg when you're not in a deficit. A randomized trial backs this up directly: higher dietary protein during an energy deficit combined with intense exercise promoted greater lean mass gain and fat mass loss than a lower-protein version of the same diet.

The logic is simple. When calories are short, your body looks for fuel anywhere it can find it, and muscle is one source. Extra protein gives your body less reason to break down muscle for energy and more raw material to repair what your training breaks down. It also tends to keep you fuller, which matters when calories are tight.

Protein does a different job when you're cutting than when you're bulking, which is why the target moves.

Spreading it through the day

Total daily protein matters more than exact timing, but per-meal size still counts for something. A position stand on nutrient timing concludes that ingesting a 20 to 40 gram protein dose of a high-quality source every three to four hours appears to favour muscle repair better than cramming it all into one or two meals. Below about 20 grams, a meal may not give your muscles enough building blocks to make the most of it; above about 40 grams, the extra mostly gets used for energy rather than extra muscle repair, though it isn't wasted or harmful.

1. 1

   Set your daily target first Work out roughly 1.6 to 2.2 grams of protein per kilogram of bodyweight if you're building or maintaining, higher if you're in a deficit.

2. 2

   Spread it across 3 to 5 meals Aim for a palm-sized serving, roughly 20 to 40 grams, at each one rather than one huge serving at dinner.

3. 3

   Adjust with your phase Nudge the target up when cutting and keep it steady when bulking or maintaining, since the goal changes but the tool doesn't.

4. 4

   Track the trend, not the day One high or low day won't matter much. What counts is your average over a week or two.

None of this needs to be exact. Hitting your protein target within 10 or 15 grams most days does the job. If you're managing a medical condition, taking medication, or have a history of disordered eating, it's worth talking to a registered dietitian or doctor before changing how much protein you eat.