What's Actually Happening When Food Goes Bad and why your nose knows before your eyes do
Open a container of leftovers that have been in the fridge a day too long, and something in your brain fires before you've even consciously registered the smell. You pull back. You know. The decision is made in under a second. That instinct is ancient. The chemistry behind it is fascinating. We tend to think of food spoilage as one thing: food going bad, but it's actually several completely different chemical processes happening simultaneously, sometimes competing with each other, occasionally producing something we decide to call cheese or wine instead of rubbish. The line between fermentation and rot is, in some ways, mostly a matter of whether we planned it. The microbial version The majority of spoilage we perceive is caused by microbial activity. Bacteria, moulds, and yeasts adhere to food surfaces and establish favourable conditions, such as moisture, warmth, and an optimal pH level, for their growth and reproduction. These microorganisms initiate the break...