Tomatoes
Putting tomatoes in the fridge will stop them from ripening and kill their flavour. According to Mercola, placing tomatoes in the fridge changes their chemical structure and reduces the amount of volatiles compounds in the fruit, which affects their flavour. A tomato's texture and colour can also be affected by cold temperatures and "chilling injuries" caused by temperatures below 5C can leave the fruit soft and pitted on the surface.
Potatoes
Potatoes need to be stored somewhere cool and dry, either in a paper or perforated bag to keep them dry - but not in the fridge. Keeping them refrigerated can change the potato's starch into sugar, which will affect their texture and cause them to become discoloured and taste sweet once cooked.
Onions
If onions are unpeeled then they need a cool dry storage place with lots of air ventilation, not a cold refrigerator.
According to the National Onion Association, the only times onions should go in the fridge is if they are bought peeled or pre-cut, or "when trying to extend the shelf life of sweet or mild onion varieties with high water content". These, however, need to be kept on a low humidity setting to keep them dry. Onions that have been cut can be kept in a sealed container for up to seven days.
Bread
The refrigerator is "really bad" for bread, according to seriouseats.com. While freezing bread can seriously stall the process that makes bread stale, putting a loaf in the fridge will speed it up. Essentially, the cool temperature causes the starch to crystalize far more rapidly than at room temperature, speeding up the process that makes bread hard and stale.
Bananas
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