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Hi Jen I think the theory is that if your blood volume is low (dehydrated) then in certain situations it is harder for your heart to pump blood up to your head, causing you to faint (or feel dizzy). You body needs water and salt to make blood (potassium is also important electrolyte) Some people just salt their food more and drink more water. I drink a rehydration fluid (which I make myself because its cheaper) although some people just drink gatorade, or even something like pedialyte. I make mine with 1 liter of water, 1 teaspoon of "lite salt" (which contains salt and potassium, very important), 1/2 tsp baking soda, and about 4 tsp sugar. I add just enough orange juice to make it palitable.