In the beginning, food can be very delicious, good to look at, smell nice, and look like it is never going to change its look but remember, Good food doesn't last forever. When foods start to spoil, depending

Autolysis means self destruction of food. Credits: Food OneHowto Food spoil by itself. it is due to enzymes present in the food. Credits: Biochemistry Society or due to chemical reactions between the compounds

Credits: Research Gates Deterioration is that stage of food spoilage at which it can be eatable by humans and will cause no harm. Credits: Research Gates While spoilage of food means it is unfit for humans

The life for which food is good for humans to eat is called shelf life. After that food will be harmful for humans. Credits: Wikipedia