Food adulteration is the intentional act of debasing the quality of food offered for sale, either by the admixture or substitution of inferior substances, or by the removal of some valuable ingredient, often for economic gain or deception. As an academic concept and research field, it involves the systematic study of these fraudulent practices, focusing on the development and application of analytical methods for detecting adulterants, evaluating the associated public health and economic impacts, and investigating regulatory and enforcement mechanisms aimed at ensuring food integrity and consumer protection.