Proteins play a central role in almost all the body's functions (proper functioning of the immune system, building muscles, etc.). They are made up of several types of amino acid, some of which are impossible for humans to synthesize (so-called "essential" amino acids), which is why it is important to have a sufficient and varied intake through the diet, as the amino acid composition varies according to the protein source. The main sources are meat, fish and eggs, as well as legumes.

For further information, we recommend that you consult :

- The MangerBouger.fr website
- The Santé Publique France website, and its nutrition and physical activity section
- The ANSES website (Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail), and its section on food and human nutrition.
- The French Nutrition Society website
- The report of the PNNS, Programme Nationale de Nutrition et Santé (2018-2023), which defines all nutritional recommendations.