How Much Protein Do You Actually Need Per Day?

The Science-Backed Recommendation

The old RDA of 0.36g per pound (0.8g/kg) was set as the minimum to prevent deficiency — not as a target for health or performance. Current research tells a very different story.

For most active adults, the evidence points to 0.7–1g of protein per pound of body weight per day (1.6–2.2g/kg). That means a 160 lb person should be eating 112–160g of protein daily — significantly more than the RDA suggests.

Quick Reference: Daily Protein Targets

Sedentary adult (weight maintenance)0.54–0.7g / lb

Active adult (3–5x/week training)0.7–0.9g / lb

Athlete or muscle building0.9–1.1g / lb

Cutting (preserving muscle in deficit)1.0–1.2g / lb

Why Athletes and Active People Need More

Exercise — especially resistance training — causes micro-damage to muscle fibers. Protein provides the amino acids needed to repair and rebuild those fibers larger and stronger. Without enough protein, you adapt poorly and recover slowly regardless of how hard you train.

A 2017 meta-analysis in the British Journal of Sports Medicine (Morton et al.) pooled data from 49 studies and 1,800 participants. It found that protein intakes above 1.62g/kg/day did not further increase lean mass gains — suggesting a ceiling effect. The sweet spot for most people is 1.6–2.2g/kg, with the higher end benefiting those in a caloric deficit.

Older adults also benefit from higher intakes. Muscle protein synthesis becomes less efficient after 40, a condition called anabolic resistance. Bumping intake to 1.0–1.2g/lb helps counteract age-related muscle loss (sarcopenia).

Top High-Protein Foods Ranked

Not all protein sources are created equal. Completeness of the amino acid profile, digestibility, and caloric cost all matter. Here are the best options across both animal and plant sources:

Food (Serving)

Protein

Calories

Chicken breast (4 oz)

35g

185 kcal

💡 Leanest animal protein by weight — the gold standard for tracking.

Greek yogurt (1 cup)

20g

130 kcal

💡 High protein + probiotics. Choose plain to avoid hidden sugar.

Canned tuna (3 oz)

20g

100 kcal

💡 Cheapest protein per gram. Limit to 2–3 servings/week for mercury.

Eggs (2 large)

12g

140 kcal

💡 Complete amino acid profile. Yolks contain choline — don't skip them.

Firm tofu (4 oz)

10g

90 kcal

💡 Best plant-based complete protein. Press it to improve texture.

Lentils (½ cup cooked)

115 kcal

💡 Pair with rice for a complete amino acid profile. Also high in fiber.

Timing: Does It Matter When You Eat Protein?

Total daily intake matters more than timing for most people. However, a few timing principles are worth following:

Distribute across meals. Research suggests muscle protein synthesis peaks at around 30–40g per meal. Eating 150g in one sitting is less effective than spreading it across 4–5 meals or snacks.
Post-workout window. Consuming 20–40g of protein within 2 hours after resistance training maximizes muscle repair. This matters more for advanced athletes than beginners.
Before bed. A slow-digesting protein like casein (cottage cheese, Greek yogurt) before sleep improves overnight muscle protein synthesis — backed by research from Maastricht University.

How AI Food Tracking Makes Hitting Your Target Easy

Most people who try to hit protein targets end up either obsessively weighing food or completely guessing. Neither works long-term. The smarter approach is using an AI food tracker that can estimate protein content from a photo of your meal — no manual logging required.

Mira's food AI recognizes ingredients, estimates portions, and calculates protein (along with all other macros and micros) in seconds. After a week of tracking, most users realize they're eating 40–60% less protein than they thought — and know exactly which meals to adjust.