How Much Protein Do You Need Per Day?
TL;DR
- Most active adults need more protein than the official RDA.
- For muscle growth and strength training, ~1.6–2.2 g protein per kg bodyweight per day is a solid evidence-based range.
- Protein needs vary based on activity level, age, and goals.
- Total daily intake matters more than exact timing.
For a complete overview of how protein intake fits into muscle growth, see the main guide on protein for muscle growth.
Beginner Explanation: Why Protein Needs Vary
Protein is essential for building and repairing tissues, producing enzymes and hormones, and maintaining muscle mass. While the official Recommended Dietary Allowance (RDA) for protein is 0.8 g per kg of bodyweight per day, this value is designed to prevent deficiency, not to optimize performance, health, or muscle mass.
If you train regularly, are dieting, or want to maintain muscle as you age, your protein needs are higher. Physical activity increases muscle protein turnover, and sufficient dietary protein is required to support recovery and adaptation.
In other words:
The minimum amount to survive is not the same as the optimal amount to thrive.
Science Review: What Does Research Say About Daily Protein Intake?
RDA vs. Optimal Intake
The RDA (0.8 g/kg/day) is based on nitrogen balance studies in mostly sedentary individuals. More recent research using advanced methods shows that this amount often underestimates true protein needs, especially for active populations.
Protein for Muscle Growth
Multiple meta-analyses indicate that muscle protein synthesis and lean mass gains are maximized at protein intakes around:
- 1.6 g/kg/day for most resistance-trained individuals
- With a practical upper range of ~2.2 g/kg/day, especially during fat loss or high training volumes
Beyond this range, additional protein does not appear to provide further muscle-building benefits for most people, although it is generally safe.
Protein Needs Increase With Age
Older adults experience anabolic resistance, meaning their muscles respond less efficiently to protein intake. Research suggests that older individuals may benefit from intakes closer to the upper end of the range to preserve muscle mass and function.
Practical Recommendations
General Guidelines
- Sedentary adults: ~0.8–1.0 g/kg/day
- Recreationally active: ~1.2–1.6 g/kg/day
- Strength training / hypertrophy: ~1.6–2.2 g/kg/day
- Fat loss phases: closer to the higher end of the range
Reaching your daily protein target becomes much easier when you choose protein-dense foods.
Example
A person weighing 75 kg who strength trains regularly would aim for roughly:
- 120–165 g protein per day
This intake can be spread across meals based on preference and appetite.
If you’re unsure how many calories and macros you need to support your goals, use our free Macro Calculator to estimate your daily calorie, protein, carbohydrate, and fat targets based on your body weight, activity level, and goal.
Protein supplements are not required, but they can be a convenient tool if they help you consistently reach your daily protein intake.
Protein Needs Depend on Goals and Context
Daily protein requirements are not fixed numbers. They depend on context, including training status, energy balance, and individual goals. Someone aiming to maintain general health may do well on moderate protein intake, while individuals focused on muscle growth or body recomposition typically benefit from higher intakes.
Protein needs also increase during periods of higher physiological stress. This includes intense training blocks, calorie restriction, or recovery from injury. In these situations, higher protein intake helps preserve lean mass and supports tissue repair.
Rather than chasing a single “perfect” number, it is more practical to aim for a consistent intake within an evidence-based range and adjust based on performance, recovery, and satiety over time.
Common Questions & Clarifications
Do you need to hit an exact number every day?
No. Small day-to-day fluctuations are irrelevant. Consistency over time matters far more.
Is more protein always better?
No. Once needs are met, additional protein offers diminishing returns for muscle growth.
What about protein timing?
Daily intake is the primary driver. Timing and distribution play a secondary role and are covered in a separate article.
References
- Morton RW et al. A systematic review, meta-analysis and meta-regression of protein supplementation on resistance training–induced gains.
British Journal of Sports Medicine.
https://pubmed.ncbi.nlm.nih.gov/28698222/ - Phillips SM, Van Loon LJC. Dietary protein for athletes: from requirements to optimum adaptation.
Journal of Sports Sciences.
https://pubmed.ncbi.nlm.nih.gov/22150425/ - Moore DR et al. Protein ingestion to stimulate myofibrillar protein synthesis.
American Journal of Clinical Nutrition.
https://pubmed.ncbi.nlm.nih.gov/20392884/
