Protein

What is protein? What are protein food sources? What is the recommended protein amount? In the IFIC Protein Toolkit, you’ll find insights, continuing education, resources and more to support your protein exploration and communication. 

Key Messages

These these science-backed key messages to confidently answer questions and guide conversations about protein. 

  • What is protein? Protein is an essential macronutrient that supports overall health. It helps build and maintain muscles and plays a key role in many body processes, including the production of hormones, neurotransmitters and enzymes. Proteins are made of amino acids, nine of which your body cannot make on its own. These “essential amino acids” must come from the foods you eat.[1],[2],[3] 
  • Where can you find protein? Protein is found in a wide variety of foods. The Dietary Guidelines for Americans recommend including both plant and animal sources such as lean meats and poultry; seafood; eggs; low-fat dairy (milk, yogurt, cheese); beans, peas, lentils; soybeans and soy products such as tofu or tempeh; and nuts and seeds.[4]
  • How much protein do you need? Protein needs vary based on age, health and activity level. The Recommended Daily Allowance (RDA) for protein is 0.8 grams per kilogram of body weight per day for adults 18 years and older.[3],[5] That’s about 64 grams per day for someone weighing 175 pounds. Most people meet this through their regular diet. Some groups – like pregnant or breastfeeding individuals, athletes and people using certain weight loss medications – may need more.[6]

Research

Stay informed on the latest protein developments by exploring peer-reviewed research, scientific reviews and emerging consumer trends.

2024 IFIC Food & Health Survey

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IFIC Survey: Consumer Viewpoints and Purchasing Behaviors Regarding Plant and Animal Protein

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Consumer Research on Plant Alternatives to Animal Meat 2.0

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Consumer Survey: Nutrient Density and Health

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Innovations in Alternative Proteins: Understanding the Viewpoints and Purchasing Behaviors of U.S. Meat Eaters

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Protein Perceptions and Consumption Behaviors

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Insights

From myths and facts to safety and effects, our Insights collection tackles some of the tougher questions surrounding dietary protein in our daily lives.

Webinars

Sharpen your science communication skills with our free webinars and CPE programs. All feature expert-backed strategies for translating nutrition and health science clearly and confidently.

Downloads to Share

Make protein conversations easier. These tools provide evidence-based insights for you and your audiences.

Plant-Based Alternatives to Meat Fact Sheet

In the News

Catch up on the latest headlines about protein for inspiration to help shape your own conversations around this everyday ingredient.

Looking for More?

We offer a variety of professional health resources that cover high-interest topics. Enhance your expertise with our wide range of toolkits filled with key messages, research, social media content, continuing education and more!

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The Acceptable Macronutrient Distribution Range (AMDR) for protein is an additional calculation that refers to the range of protein intake that is considered healthy and provides adequate nutrition. This range is 10%-35% of total daily calorie intake.[5] Based on a 2,000-calorie diet, the AMDR for protein would be 200-700 calories per day. Since protein provides 4 calories per gram, this equates to a daily range of 50-175 grams of protein.

 

[1] A.D.A.M. Medical Encyclopedia [Internet]. Johns Creek (GA): Ebix, Inc., A.D.A.M.; c1997-2025. Protein in diet. [reviewed 2023 Apr 13; cited 2025 Jul 1]; [about 2 p.]. Available from: https://medlineplus.gov/ency/article/002467.htm
[2] National Research Council (US) Subcommittee on the Tenth Edition of the Recommended Dietary Allowances. Recommended Dietary Allowances: 10th Edition. Washington (DC): National Academies Press (US); 1989. 6, Protein and Amino Acids. Available from: https://www.ncbi.nlm.nih.gov/books/NBK234922/
[3] Institute of Medicine. Protein and Amino Acids. In: Dietary Reference Intakes: The Essential Guide to Nutrient Requirements. Washington, DC: The National Academies Press; 2006. doi:10.17226/11537
[4] United States Department of Agriculture. MyPlate Protein Foods Group. 1 July 2025. https://www.myplate.gov/eat-healthy/protein-foods
[5] Wolfe RR, Cifelli AM, Kostas G, Kim IY. Optimizing protein intake in adults: interpretation and application of the recommended dietary allowance compared with the acceptable macronutrient distribution range. Adv Nutr. 2017;8(2):266–275. doi:10.3945/an.116.013821
[6] Gigliotti L, McNeill S, Schmidt S, et al. Incretin-based therapies and lifestyle interventions: the evolving role of registered dietitian nutritionists in obesity care. J Acad Nutr Diet. 2024;125(3):408–421. doi:10.1016/j.jand.2024.10.023