Author’s Note: As a chef focused on nutrition for my clients, I bridge the gap between nutrition science and actual kitchen preparation. People frequently ask me how much protein they should aim for when building their meals. Rather than pushing a single number, this guide breaks down what the leading institutions and researchers say so you can choose the right target for your lifestyle.
The Protein Debate
Protein has received an unprecedented amount of attention in recent years. Between podcasts, fitness influencers, protein-fortified grocery products, and updated federal dietary guidelines, the prevailing message seems simple: more protein is better.
Or is it?
Perhaps we are hearing the loudest voices in a protein boom that will eventually fade. And while the loud consensus urges us to stack our plates with extra protein, some longevity experts argue that most people already get enough protein—and that eating more may even carry negative health consequences.
Importantly, the debate is not about whether protein is necessary. It is. The real dispute centers on whether eating beyond basic nutritional adequacy provides meaningful health benefits, under what specific circumstances higher intake is justified, and whether high-protein diets come with long-term longevity costs.
Protein Perspectives
Rather than prescribing a single, rigid daily target, this article compares recommendations from world-renowned institutions, researchers, and health communicators across the full range of views. The goal is to understand not only what number each source recommends, but what that number is intended to accomplish.
Some recommendations aim to meet the needs of nearly all healthy adults. Others prioritize training, muscle growth, and protection against age-related muscle loss. Still others prioritize longevity and caution that chronically high protein intake may stimulate biological pathways associated with aging and raise the risk of chronic diseases.
Protein needs also vary with age and activity level. Someone who regularly performs resistance training may benefit more from higher protein intake than someone who is sedentary. An adult over 65 trying to combat age-related muscle loss may have different priorities from someone in their twenties.
Rather than follow one expert’s recommendation without context, compare the reasoning behind each number and decide which framework best aligns with your priorities and views.
Protein Frameworks
Use the framework below to categorize the primary goals behind each recommendation:
| Framework | Question it is trying to answer | Examples in this article |
| Nutritional adequacy | What amount meets the needs of nearly all healthy adults? | RDA, WHO, EFSA, Academy |
| General health guidance | What range should the broader population aim for? | 2025–2030 Dietary Guidelines |
| Muscle and performance | What amount supports training, recovery, and muscle preservation or growth? | ACSM, ISSN, Phillips, Patrick, Attia |
| Longevity caution | Could lower intake reduce negative health consequences or aging risks? | Buettner, Longo, Lamming, Fontana |
Quick note on units: all recommendations are expressed as grams of protein per kilogram of body weight (g/kg), followed by grams per pound (g/lb).
Daily Protein Recommendations
1. Official Institutional Guidelines
The Recommended Dietary Allowance (US RDA)
Target: 0.8 g/kg (0.36 g/lb)
Overview: Designed to meet the protein requirements of nearly all healthy adults, the RDA is an adequacy benchmark—not a target specifically developed to maximize training adaptations or muscle growth.
Academy of Nutrition and Dietetics
Target: 0.8 g/kg (0.36 g/lb)
Overview: The academy follows the RDA as a baseline for healthy adults, while recognizing that individual protein needs vary with age, activity level, and life stage.
World Health and Organization (WHO) & European Food Safety Authority (EFSA)
Target: 0.83 g/kg (0.36 g/lb)
Overview: Both international health bodies set their population-level reference value at 0.83 g/kg for healthy adults. Like the U.S. RDA, this is designed to cover the needs of nearly all healthy people – not necessarily to maximize muscle gain, athletic performance, or preservation of lean mass during aging.
2025-2030 Dietary Guidelines for Americans
Target: 1.2 – 1.6 g/kg (0.54 – 0.73 g/lb)
Overview: Released in 2026, the updated guidelines recommend a baseline 50% to 100% higher than the RDA. The new target coincides with the increasingly prominent view that protein intake should support broader health outcomes rather than nutritional adequacy alone.
American College of Sports Medicine (ACSM) & International Society of Sports Nutrition (ISSN)
ACSM Target: 1.2 – 2.0 g/kg (0.54 – 0.91 g/lb)
ISSN Target: 1.4 – 2.0 g/kg (0.64 – 0.91 g/lb)
Overview: Both the ACSM and the ISSN tailor their recommendations specifically to physically active individuals. They emphasize that regular exercise increases amino acid turnover, requiring higher intake to support muscle repair and metabolic adaptation.
2. Independent Researchers & Health Communicators
The Longevity Perspective
Dan Buettner
Target: 0.66 g/kg (0.30 g/lb)
Overview: Dan Buettner is the founder of Blue Zones. He recommends about 0.66 g/kg per day based on his observations of long-lived populations.
Valter Longo, PhD
Target: 0.7 – 0.8 g/kg (0.31 – 0.36 g/lb)
Overview: Valter Longo, PhD, is a professor of gerontology at USC and director of the USC Longevity Institute. Longo recommends relatively low protein intake until approximately age 65, followed by a modest increase to help prevent muscle loss. He cautions that high protein intake during midlife—particularly from animal sources—may promote biological pathways associated with aging and age-related diseases, such as cancer.
Dudley Lamming, PhD
Target: 0.8 g/kg (0.36 g/lb)
Overview: Dudley Lamming is a professor at the University of Wisconsin–Madison who studies the biology of aging. He believes that most sedentary adults should remain near the RDA. In his view, chronically high protein intake may have adverse metabolic and longevity effects. He supports higher intake for older adults at risk of muscle loss and for people who regularly exercise.
Luigi Fontana, MD, PhD
Target: 0.8 g/kg (0.36 g/lb)
Overview: Luigi Fontana, MD, PhD, is a physician-scientist and longevity researcher. He argues that keeping protein near the RDA may better support long-term health than consuming chronically high amounts.
The Muscle Preservation & Optimization Perspective
Stuart Phillips, PhD
Target: 1.2 – 1.6 g/kg (0.54 – 0.73 g/lb)
Overview: Stuart Phillips is a kinesiology professor at McMaster University and one of the world’s leading protein researchers. He argues that the RDA is an adequacy benchmark rather than an optimal target for muscle. However, he emphasizes that the benefits of higher intake depend heavily on resistance exercise and generally plateau around 1.6 g/kg/day for most people.
Rhonda Patrick, PhD
Target: 1.2 – 1.6 g/kg (0.54 – 0.73 g/lb)
Overview: Rhonda Patrick, PhD, is a popular health science communicator and podcaster. She believes the RDA is too low and recommends this higher range to support muscle health and healthy aging.
Peter Attia, MD
Target: 1.6 – 2.2 g/kg (0.73 – 1.0 g/lb)
Overview: Peter Attia, MD, is a physician, longevity expert, and host of The Drive podcast. He advocates for at least double the RDA to support muscle mass and healthspan.
Conclusion
So where does that leave you? With credible recommendations spanning 0.66 to 2.2 g/kg – coming from a variety of perspectives and goals – there is no single “correct” number that applies to everyone.
The RDA, WHO, EFSA, and the Academy are primarily establishing nutritional adequacy, while ACSM and ISSN primarily address exercising populations. Phillips, Patrick, and Attia give greater weight to preserving or building muscle. Buettner, Longo, Lamming, and Fontana place greater weight on possible longevity tradeoffs. And the new Dietary Guidelines set a comparatively high target for the general population.
Choosing the Best Protein Target for YOU
That changes the question. Instead of asking which expert has discovered the one correct number, ask what outcome a recommendation is intended to optimize, what population it was developed for, and how closely that situation resembles your own. A sedentary adult concerned primarily with adequacy is asking a different question from an athlete. Both are asking a different question from someone trying to balance muscle preservation against possible long-term negative health consequences.
There is no single number here that resolves all of those goals. By understanding the underlying philosophy behind each number, you can stop following blanket advice and choose a target that aligns with your specific lifestyle, age, and health priorities.