5 Stay hydrated thinkstock.jpg

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Shreeves says “dehydration is thought to contribute to decompression sickness risk, but being overly hydrated may contribute to immersive pulmonary edema (in swimmers as well as divers, btw).” He explains, “It’s not that complicated — avoid the extremes. Drink enough to avoid thirst and have light color urine, but don't force yourself to drink more than that.”