Food adulteration occurs when cheaper or inferior substances are substituted wholly or in part for a food product, or when any valuable or necessary constituent has been abstracted, so that the food fails to meet legal standards. There are several types of food adulteration in Bangladesh, including adding substances that depreciate or injuriously affect foods. The laws against food adulteration in Bangladesh include the Bangladesh Pure Food Ordinance of 1959, Section 18 of the constitution, and the Bangladesh Pure Food Act of 2005. Reducing food adulteration requires being aware of its bad effects, applying rules against it, avoiding unhygienic food preparation places, and raising public awareness.