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. The floor is roughly 1.6 g/kg — below it, you leave muscle on the table. The ceiling is around 2.2 g/kg — above it, extra protein stops contributing to muscle and just becomes expensive calories. 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 — around 2.0–2.2g/kg — 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.

After approximately 2.2g/kg, muscle-building benefits plateau and extra protein mostly becomes additional calories. 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.