What types of organism can cause decay of foods?

Various types of organisms can cause food decay, primarily including bacteria, molds, and yeasts. Bacteria, such as Salmonella and E. coli, can spoil food and pose health risks, while molds can produce toxins and alter food texture and flavor. Yeasts, often involved in fermentation, can also spoil sugary foods. These organisms thrive in warm, moist environments, accelerating the decay process.