How Much Protein Do You Really Need? The Science Explained

Protein Matters More Than Most People Realize

Protein is the one macro most people manage to both overthink and under-eat at the same time. They worry about timing, sources, and shakes, while quietly falling short of the only number that actually matters: the daily total.

There’s a floor and a ceiling, and the useful range lives between them. Around 1.6 g/kg is where most of the benefit is already banked; push past it and each extra gram does a little less. By roughly 2.2 g/kg you have comfortably covered what almost anyone building muscle needs. The exception is dieting: when you are eating less and want to hold onto muscle, going higher genuinely helps, and lean people in a hard deficit do better still at 2.5 g/kg and above. So treat 1.6–2.2 as the everyday band, not a wall. Land anywhere in that band and you’ve solved protein; everything else is fine-tuning.

Example: 70kg person → 112–154g protein per day.

Protein Needs Increase During Fat Loss

Higher protein intake helps preserve muscle while dieting. When eating in a calorie deficit, aim for the higher end of the range (2.2g/kg or above, and higher still if you are lean and dieting hard) to minimize muscle loss.

More Protein Does Not Always Mean More Muscle

Eating well past the ceiling is like overfilling a fuel tank. It doesn’t take you further; it just spills out the side. Your body uses what it needs for muscle and burns the rest as ordinary energy.

Above roughly 2.2g/kg, the muscle-building returns for someone eating at or above maintenance are small enough not to be worth chasing, and the extra mostly becomes additional calories. The one situation where going higher is worth it is dieting, where more protein measurably protects muscle. Eating significantly more than this range adds calories without adding muscle-building benefit.

Whole Foods Usually Work Just as Well as Shakes

Best whole food protein sources:

• Chicken breast
• Eggs
• Tuna
• Greek yogurt
• Lean beef

Protein powder is a convenient supplement when hitting daily targets through food alone is difficult. It has no special muscle-building advantage over whole food sources.