Industrial enzymes manufactured through genetic engineering: the coding DNA is edited in the test tube, inserted into a production host, and expressed at scale. The food industry runs on these molecules, chymosin that sets cheese milk, amylases that drive baking, pectinases that clarify juice, all delivered with purity and batch consistency the old extraction methods could not match. Protein engineering extends the platform, tuning heat tolerance and pH optima. Regulators assess the host organism, the genetic construct, and the final preparation before granting food-use approval.