Proteins are large biomolecules consisting of one or more long chains of amino acid residues linked by peptide bonds. They perform a vast array of functions within organisms, including catalyzing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting molecules. In food science, proteins contribute to texture, flavor, and nutritional value in spices and food compounds. They are polymers with molecular weights typically ranging from thousands to millions of daltons. Proteins denature under heat, pH changes, or mechanical stress, altering solubility and functionality. As essential macronutrients, they supply amino acids for human nutrition and are present in varying amounts in plant and animal-derived foods.