How Much Protein Per Day — The Math Is Easy, Hitting It Is Not
The ISSN range is 1.4-2.0g per kg of body weight. The math takes three seconds; the ceiling on how much your body uses per sitting is what makes it hard to hit.
1.6g per kilogram of body weight. That is the floor the International Society of Sports Nutrition recommends for protecting muscle while losing fat. At 85kg that is 136g a day.
The math ends there. Everything after it is the hard part.
There is a ceiling on what one meal can use
Look only at the daily total and back-loading sounds fine — skip breakfast, eat a large dinner, hit the number. But the amount used for muscle protein synthesis in a single sitting flattens out around 0.4g per kg of body weight.
Split 136g across three meals and each one needs 45g, which is above what a single sitting uses. That is why the number lands in four feedings rather than three, and why the big-dinner strategy quietly fails.
Why it runs short
- Rice, noodle and bread based meals fill you on carbohydrate first
- Protein is highly satiating, so eating enough crowds other food out — which also means you skip it unless you plan for it
- You cannot back-load it. Roughly 40-50g per sitting is the practical ceiling
What 136g actually looks like
- Breakfast — 3 eggs (19g) + 1 cup Greek yogurt (18g) = 37g
- Lunch — 150g chicken breast (46g) + rice = 46g
- Dinner — 120g beef (31g) + half block tofu (9g) = 40g
- Snack — 1 scoop whey = 24g
That totals 147g. The pattern to notice: one palm-sized portion of protein at every meal.
Do you need a supplement
No. Whole food is fine when you can hit the number with it. But as the list above shows, missing one meal leaves a 30-40g hole that is hard to make up later. A shake fills that gap; it is a tool, not a requirement.