Certain fruit and vegetables, such as bananas, avocados, tomatoes, peaches and pears, give off a gas called ethylene, which promotes ripening and can cause spoilage. If you store them with ethylene-sensitive foods like potatoes, apples, berries and peppers, the ethylene will ripen them, so be aware when you're organising and storing food. Potatoes, garlic, onions and bananas should never be stored in the fridge.