The phrase "you don't know what you have until it's gone" can apply to terrible things too. You may not realize the amount of pain, depression, or abuse you are living through until you experience what life can be without it.
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Boris's stomach was big enough that he couldn't really afford to be a picky eater. Instead, he cultivated a deep appreciation of simple gustatory pleasures - a side of beef, an entire wheel of cheese, a crate of bread.