Sodium
If you don't have enough sodium, your circulating blood volume has to shrink to keep sodium concentration normal. As you sweat, your body depletes sodium, causing this shrinking. As blood volume shrinks you may feel light-headed, and could eventually face more serious issues.

Salt is a critically important nutrient for activity, especially on a low carb diet. When carbs are restricted the body switches from retaining water and salt to discarding them. If lost salt is not replaced, blood flow and nutrient balances may be impaired.
Good sources of salt
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