The most important reason why you shouldn’t keep your bread on the counter is because it will get mouldy quite quickly. Room temperature is the ideal temperature for moulds to grow and develop. If you place a bag of bread on the counter, the mould will start to develop almost right away. Within a few days, you’ll see those gross mouldy spots appear. Are you still eating the bread, despite the mould? Then you run the risk of getting an allergic reaction. That’s why it’s much better for you and your health to put the bread in the freezer and simply take it or a piece of it out when you need it.