How Much Protein Do You Actually Need? Cut Through the Noise.

The RDA says 0.8g per kilogram. Research says that number is wrong for anyone who trains. Here's what the evidence actually supports — and why most people are still under-eating protein.

The official recommended daily allowance for protein is 0.8 grams per kilogram of body weight — about 0.36 grams per pound. For a 180-pound person, that's roughly 65 grams a day. That number was established to prevent deficiency in sedentary adults. It was never designed to optimize performance, body composition, or recovery for someone who actually trains.

If you exercise consistently and are using that number as your target, you are under-eating protein. The evidence is clear on this — and the gap between the RDA and what active people actually need is significant.

What the research actually supports

The current consensus in sports nutrition research is that active individuals need between 1.6 and 2.2 grams of protein per kilogram of body weight per day (roughly 0.7–1.0 grams per pound) to support muscle protein synthesis, preserve lean mass, and optimize recovery. For people in a caloric deficit — trying to lose fat while maintaining muscle — the upper end of that range or slightly above is appropriate, because protein becomes even more important for muscle preservation when you're eating less.

Why protein matters more than most people realize

• –Muscle repair and growth: Every training session creates micro-damage to muscle tissue. Protein provides the amino acids — particularly leucine — that trigger muscle protein synthesis and drive repair and adaptation.
• –Satiety: Protein is the most satiating macronutrient. Higher protein intake naturally reduces hunger and total calorie intake without requiring willpower.
• –Metabolic rate: Muscle is metabolically active tissue. Maintaining it through adequate protein keeps your resting metabolic rate higher as you age or diet.
• –Recovery speed: Inadequate protein slows recovery between sessions. If you're training 4–5 days a week and under-eating protein, you are limiting your results at a fundamental level.

The practical targets

For most people who train consistently, aiming for 0.7–1.0 grams of protein per pound of body weight is a reasonable and well-supported target. If you're in a fat-loss phase, aim for the higher end. If you're maintaining or in a surplus, 0.7–0.8g/lb is generally sufficient.

For context, a 180-pound person at 0.8g/lb needs about 145 grams of protein per day. That's more than double the RDA — and it's what the literature supports for active people.

Protein timing: what matters and what doesn't

The "anabolic window" — the idea that you must consume protein within 30 minutes post-workout or the session was wasted — is overblown. Total daily protein intake is far more important than timing. That said, there is value in distributing protein across multiple meals rather than front- or back-loading it. Muscle protein synthesis is maximized at a per-meal dose of roughly 20–40 grams, depending on body size. Eating 140 grams in one sitting is significantly less effective than spreading it across four meals.

Protein quality

Not all protein is created equal. Complete proteins — those containing all nine essential amino acids in adequate amounts — are most effective at stimulating muscle protein synthesis. Animal sources (meat, fish, eggs, dairy) are generally complete. Plant sources are typically lower in leucine and may be incomplete, which means plant-based athletes need to be more intentional about combining sources and may benefit from slightly higher total intakes to achieve equivalent stimulation of muscle protein synthesis.

Common high-protein foods and rough protein content

• –Chicken breast (6 oz): ~50g protein
• –Salmon (6 oz): ~40g protein
• –Greek yogurt, plain (1 cup): ~20g protein
• –Whole eggs (3 large): ~18g protein
• –Cottage cheese (1 cup): ~25g protein
• –Lean ground beef (4 oz): ~28g protein

The bottom line

If you train seriously, the RDA is not your target. Aim for 0.7–1.0 grams per pound of body weight. Distribute it across meals. Prioritize complete protein sources. Most people who feel like they're doing everything right and not getting results are under-eating protein — it's that common, and the fix is that simple.