How Much Protein Do You Actually Need?

Part of The Protein Atlas — your complete guide to protein.

Wondering why protein matters for weight loss? Read the science first →

54 grams of protein a day. That’s the official recommendation—the RDA (Recommended Dietary Allowance). For a 150-pound person. Two chicken breasts. Done.

Except it’s not done. That number was designed to prevent deficiency—the bare minimum to avoid muscle wasting in sedentary people. It came from 1940s research. It doesn’t help you build muscle, lose fat without feeling starving, or stop craving snacks two hours after every meal. (And no, higher protein doesn’t damage healthy kidneys—that myth comes from guidelines for people with existing kidney disease.)

If you’re reading a site called Protein Atlas, you probably have different goals. The actual research points somewhere higher.

What the Research Actually Says

Ignore the influencers. Here’s what holds up.

The landmark paper is a 2018 meta-analysis by Morton, Schoenfeld, and Phillips—49 studies, 1,863 participants. Their finding: protein intake up to 1.6 g/kg/day significantly increased muscle mass and strength during resistance training. Beyond that? Gains plateaued. (This is the most-cited paper on protein requirements for a reason. Subsequent research has reinforced it, not overturned it.)

The second touchstone is Phillips & Van Loon (2011), which established the 1.3–1.8 g/kg/day range for athletes—still the reference point in sports nutrition guidelines today.

A useful starting point: about 1 gram per pound of your target body weight. But if you want precision, here’s what the research actually supports:

Goal	Target	~150 lb (68 kg)	~180 lb (82 kg)
Maintain	1.0–1.2 g/kg	70–80g	85–100g
Lose fat	1.2–1.6 g/kg	80–110g	100–130g
Build muscle	1.6–2.2 g/kg	110–150g	130–180g

The ranges exist because individual response varies—metabolism, training intensity, age, and how much muscle you’re carrying all matter. Start at the low end, assess for 2–3 weeks, and adjust up if you’re not seeing progress. (This is not the place to optimize. Pick a number, hit it consistently, and move on with your life.)

Calculate Your Target

Skip the math. Enter your details and get your personalized protein target:

The “1 gram per pound” rule you hear in gyms? It’s on the high end (2.2 g/kg), but it’s not wrong—just a margin of safety. If simple math helps you hit your target, use it. Precision is overrated.

A note on plant protein: Plant sources are less bioavailable and lower in leucine—the amino acid that triggers muscle synthesis. Vegetarian or vegan? Aim for the higher end and prioritize soy, seitan, and legume-grain combinations. (And stop listening to people who say plant protein “doesn’t count.” It counts. You just need more of it.)

The weight loss number matters. A 2024 meta-analysis of 47 studies confirmed that protein above 1.3 g/kg/day significantly prevents muscle loss during calorie restriction. Below 1.0 g/kg? You’re losing muscle along with fat. That tanks your metabolism and sets you up to regain everything. Read that again.

Age Changes the Math

After 65, your body becomes less efficient at using protein to build and maintain muscle. Researchers call this “anabolic resistance.” The same 30g chicken breast that triggers muscle protein synthesis in a 30-year-old? About 16% less effective in a 65-year-old. Same food. Less response.

This is why sarcopenia—the gradual loss of muscle mass that accelerates with age—hits hard in your 60s and beyond. (And it’s not just about looking frail. Muscle mass predicts everything from fall risk to how well you recover from surgery.)

If you’re over 65, shift the targets:

• Baseline: Add 20–25% → aim for 1.0–1.2 g/kg minimum
• Active / exercising: 1.2–1.5 g/kg
• Recovering from illness: 1.5+ g/kg

One more thing: per-meal minimums matter more with age. Younger adults can trigger muscle protein synthesis with 20g. Older adults need 30–40g per meal to get the same response. That weak breakfast of toast and coffee? It’s costing you muscle. Front-load protein early in the day, or you’re fighting biology.

Timing is Overrated

You’ve probably heard you need to slam a protein shake within 30 minutes of your workout or your gains evaporate. This is mostly nonsense.

A 2013 meta-analysis by Aragon and Schoenfeld—the definitive review on this topic—found no evidence for a narrow “anabolic window.” The elevated muscle protein synthesis after exercise lasts 24+ hours, not minutes.

That said, two things are worth doing:

1. Spread it across meals. 3–4 doses of 30–40g beats one giant 120g dinner. Your body can only use so much at once.

2. Don’t train fasted then wait hours to eat. If your last meal was 5+ hours ago, eating sooner post-workout does help.

But obsessing over the exact minute you drink your shake? Save your mental energy for hitting your daily target.

Make It Practical

Breakfast is where protein plans die. Most people eat 10–15g (toast, cereal, sad banana) when they need 40+. (This isn’t a willpower problem. It’s a habit problem. Nobody craves chicken at 7 AM—until they’ve done it for two weeks.)

Fix breakfast, and the rest of the math works itself out.

Here’s what 147g in three meals actually looks like:

Meal	Recipe	Protein	Calories
Breakfast	Greek Yogurt Berry Bowl	53g	536
Lunch	Cottage Cheese Everything-Bagel Bowl	39g	372
Dinner	Korean Beef Bulgogi Bowl	55g	739
Total		147g	1,647

That’s 36% of calories from protein. No powder. No obsessive tracking. No standing in the kitchen at 10 PM wondering if you hit your macros. Just three meals that do the work.

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The government says 54 grams. The research says more. You now have the numbers.

The only question left: will you actually hit them?

Start with high-protein breakfasts—the meal most people get wrong. Fix breakfast, and the rest falls into place.