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Protein is a macronutrient that is essential for building and repairing tissues in the body. It is made up of building blocks called amino acids, which are linked together in various combinations to form different proteins. Protein is found in many different foods, including meat, fish, eggs, dairy, legumes, and grains.


  • Chicken breast
  • Tuna fish
  • Eggs
  • Black beans


Related Terms

  • Muscle synthesis
  • Nitrogen balance
  • Protein quality
  • Protein requirement

Madeleine Smith

Content Lead at

Madeleine is passionate about empowering individuals with the information and tools they need to transform their bodies and lives.