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Asked by Honey-G on 30 Oct 2024.
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Sarah Montgomery answered on 30 Oct 2024:
Most food goes mouldy once opened, and this happens faster at room temperature than in the fridge.
Fully sealed cans and jars usually don’t go mouldy because the inside is sterile – all the mould and bacteria has been killed, by heating or sometimes using gamma rays, and the seal means nothing else can get in.
As soon as you open the car or jar, bacteria and mould from the air falls in and can start to grow. Foods with a lot of salt or vinegar are harder for mould to grow on so they can last longer without going mouldy – these methods of food preservation were very important before everyone had a fridge!
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Emilia Arguello answered on 4 Nov 2024:
Mold grows best in warm, moist environments, so virtually any food that has a bit of moisture could mold under the right conditions. Baby food is quite wet, so it can definitely mold once opened, as the sterile seal of the jar/pack is broken and the food is exposed to the exterior, which is full of bacteria and fungi. Best way to prevent it is to consume the food quickly after it’s been open, and to store it in the fridge when not in use!
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