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Sources of Recommendations

Last updated: April 17, 2026

PRTN AI provides personalized protein intake recommendations based on body weight, training goal, and (if specified) weight-loss medication. This document describes the scientific sources that underpin our recommendations.

Important: PRTN AI does not provide medical advice. All recommendations are for general informational purposes only. Please consult a physician or qualified dietitian before making significant dietary changes, especially if you have pre-existing health conditions.

Our Recommendation Ranges

Training GoalMultiplier
Muscle gain2.0 g/kg/day
Maintain1.6 g/kg/day
Weight loss1.8 g/kg/day
Performance1.8 g/kg/day
GLP-1 medication or bariatric surgeryadditional +0.2 g/kg/day

Results are rounded to the nearest 5 g.

Scientific Sources

Baseline and Minimum Requirements

  1. Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. Washington, DC: The National Academies Press; 2005. DOI: 10.17226/10490

Protein and Exercise (Position Stands)

  1. Jaeger R et al. International Society of Sports Nutrition Position Stand: protein and exercise. JISSN. 2017;14:20. DOI: 10.1186/s12970-017-0177-8. PMID: 28642676
  2. Thomas DT, Erdman KA, Burke LM. ACSM Joint Position Statement: Nutrition and Athletic Performance. Med Sci Sports Exerc. 2016;48(3):543–568. DOI: 10.1249/MSS.0000000000000852. PMID: 26891166

Muscle Growth: Optimal Dosing

  1. Morton RW et al. Protein supplementation and resistance training-induced gains in muscle mass and strength. Br J Sports Med. 2018;52(6):376–384. DOI: 10.1136/bjsports-2017-097608. PMID: 28698222
  2. Phillips SM, Van Loon LJC. Dietary protein for athletes: from requirements to optimum adaptation. J Sports Sci. 2011;29(sup1):S29–S38. DOI: 10.1080/02640414.2011.619204. PMID: 22150425

Protein During Caloric Deficit and Weight Loss

  1. Helms ER et al. Dietary protein during caloric restriction in resistance trained lean athletes. Int J Sport Nutr Exerc Metab. 2014;24(2):127–138. DOI: 10.1123/ijsnem.2013-0054. PMID: 24092765
  2. Mettler S, Mitchell N, Tipton KD. Increased protein intake reduces lean body mass loss during weight loss in athletes. Med Sci Sports Exerc. 2010;42(2):326–337. DOI: 10.1249/MSS.0b013e3181b2ef8e. PMID: 19927027

GLP-1 Medication and Bariatric Surgery

  1. Nunn E, Jaiswal N, Graeff J. GLP-1 receptor agonists and skeletal muscle: a dual-edged sword? Nat Rev Endocrinol. 2024. DOI: 10.1038/s41574-024-01072-1
  2. Mechanick JI et al. AACE/TOS/ASMBS Guidelines for bariatric surgery patient nutrition. Obesity. 2013;21(S1):S1–S27. DOI: 10.1002/oby.20461. PMID: 23529939

Safety of High Protein Intake

  1. Antonio J et al. A high protein diet has no harmful effects: a one-year crossover study. J Nutr Metab. 2016;2016:9104792. DOI: 10.1155/2016/9104792. PMID: 27807480

Protein Needs in Older Adults

  1. Bauer J et al. PROT-AGE Study Group: optimal dietary protein intake in older people. JAMDA. 2013;14(8):542–559. DOI: 10.1016/j.jamda.2013.05.021. PMID: 23867520

Protein Distribution

  1. Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? JISSN. 2018;15:10. DOI: 10.1186/s12970-018-0215-1. PMID: 29497353