Will Greek yogurt go bad if left out overnight?

Greek yogurt, like most dairy products, is perishable and susceptible to spoilage if left out at room temperature for an extended period. Greek yogurt contains live and active cultures, including Lactobacillus bulgaricus and Streptococcus thermophilus, which continue to ferment and multiply when exposed to warm temperatures. This fermentation process can cause the yogurt to become sour, develop an unpleasant odor, and change in texture. Additionally, leaving Greek yogurt out overnight exposes it to potential contamination from microorganisms present in the environment. Therefore, it is generally recommended to refrigerate Greek yogurt and consume it within the "best before" date indicated on the packaging to ensure its safety and quality.