What type of bacreria cause food to perish an become unfit?

Food spoilage is primarily caused by bacteria such as Pseudomonas, Lactobacillus, and Clostridium species. These bacteria thrive in nutrient-rich environments and can produce enzymes that break down food components, leading to off-flavors, odors, and texture changes. Additionally, pathogenic bacteria like Salmonella and E. coli can contaminate food, making it unsafe to consume. Proper food handling and storage practices can help minimize bacterial growth and preserve food quality.