Abstract: Disclosed are methods and systems that enable real-time, continuous reduction in the rate of degradation of oils used to fry foods. The disclosed methods and systems accomplish this by reducing the rate of accumulation of undesirable oil breakdown byproducts, keeping the levels of these undesirable compounds below those at which food quality is negatively impacted and oil degradation accelerates. The disclosed methods and systems thus enable improved frying oil lifetimes, decreased frying oil consumption, greater consistency in fried food quality, and/or improvements in worker safety relative to conventional frying methods.