How Much Protein
Do You Actually Need?
"More" isn't a number — and the actual answer is far less dramatic than the marketing suggests.
Protein is having a moment. Every fitness influencer, food brand, and diet book seems to agree on one thing: you need more of it. But "more" isn't a number — and the actual answer is far less dramatic than the marketing suggests.
Here's what the research actually says about how much protein you need.
Sedentary adults
The Baseline
0.8g
per kg
The Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of body weight — about 0.36 grams per pound. For a 150-pound person, that's roughly 54 grams per day.
This is the amount needed to prevent deficiency in a sedentary adult. It's not the "optimal" amount for anything — it's the minimum to keep your body functioning.
Important context: Most people in the US already meet or exceed this baseline. Men ages 19–59, in particular, typically eat more protein than they need without trying.
Active adults
If You Exercise
1.2–2.0g
per kg
If you're active, your needs go up. The range depends on how hard you train:
- ✓Moderate exercise: 1.1–1.5g per kg
- ✓Regular weight training or endurance training: 1.2–1.7g per kg
- ✓Building muscle: around 1.6–2.2g per kg is the commonly cited range for maximizing muscle protein synthesis
For a 150-pound (68kg) person, that's roughly 80–150 grams per day depending on activity level.
Older adults
Over 40–50
1.0–1.6g
per kg
Starting around age 40–50, muscle mass begins to decline naturally — a process called sarcopenia. Higher protein intake helps preserve muscle, strength, and mobility.
The recommendation jumps to 1.0–1.6g per kg for older adults, with some sources suggesting 1.2–1.6g per kg as the target range.
In a calorie deficit
Losing Weight
Up to 2.3g
per kg
When you're in a calorie deficit, your body is more likely to break down muscle for energy. Higher protein intake protects against this. Some dietitians recommend up to 2.3g per kg during weight loss to preserve lean mass.
The Upper Limit: Stay Under 2g per Kilogram
For most healthy adults, protein is safe up to about 2 grams per kilogram per day. Beyond that, there's no added benefit for muscle growth — excess protein is either used for energy or stored as fat.
People with chronic kidney disease may need to limit protein, so check with a doctor if that applies to you.
🍽️Spread It Across the Day
Your body can only use so much protein at once. Research suggests 15–30 grams per meal is the sweet spot for muscle protein synthesis — eating 100 grams in one sitting doesn't do more than eating 30.
Aim for protein at breakfast, lunch, and dinner, rather than saving it all for a massive evening meal.
💡The Bottom Line
Most people don't need as much protein as the internet claims. If you're sedentary, 0.8g/kg is your baseline. If you train, aim for 1.2–2.0g/kg. If you're older or losing weight, lean toward the higher end.
But here's the thing: hitting a protein target consistently is harder than knowing the number. That's where a plan helps.
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