Why does yoghurt have to be refrigeratored but there is yoghurt on muesli bars and such that doesn’t need to be refrigerated?

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Why does yoghurt have to be refrigeratored but there is yoghurt on muesli bars and such that doesn’t need to be refrigerated?

In: Chemistry

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Their composition is different, one will be formulated with preservatives in mind, but another big difference is water. If something is wet or in a liquid state, it’s far easier for bacteria to access the sugars etc and make it go bad.