How Does Mold Grow on Food?

By Lauren Farrelly

Conditions for Mold Growth

Mold needs four things in order to grow: water, food, suitable air quality and temperature. Food that contains any kind of water or fluid is susceptible to mold growth. In addition, mold can only grow if it has food readily available to feed itself and grow. Mold is a fungus that feeds off of dead or dying organic matter, and can be destructive to your health and food quality. Mold will grow best in damp, dark and cool conditions, but can also grow in warmer temperatures as well. Mold grows best between 55 to 70 degrees Celsius.



How Mold Grows on Food

Tiny mold spores are all around us in the air, which is not harmful to our health in moderation. Once a spore lands on a surface, it searches for water and nutrients to feed off of. Food is able to grow mold easily because it is often kept in the perfect environment to foster mold growth. The temperature is usually about right, air quality is good, and the food itself provides the nutrients and water the mold needs in order to grow. As the spore takes root, it begins to spread and create more spores and spread quickly on the surface of your food. Some molds can take over your food in a matter of 12 to 24 hours, while others may take weeks.

Dangers of Mold on Food

Mold can be very dangerous if eaten. Mold is perhaps most common on bread, cheese, and fruits and vegetables left out in the kitchen. Eating mold on any item has the potential to make you very sick. Simply cutting off the moldy part does not render the food safe to eat. Mold has the ability to penetrate deep into the food and not just fester on the surface. If you do spot mold on your food, it is best to inspect the entire serving and not just one spot. In addition, if the food you are eating is part of a package of multiple servings, you should check all of them--mold can spread very quickly and infest an entire package of food.

About the Author

Lauren Farrelly has been writing and producing for television since 2003. She has experience covering sports, business news and general news events for CNBC, ESPN and Bleacher Report. Farrelly has a BA in broadcast journalism from Arizona State University.