Note that if you take B vitamins or eat riboflavin-rich foods, that can throw off the results.3894 Riboflavin (also known as vitamin B2) gets its name from the Latin word flavus, for yellow.3895 So if you dust your air-popped popcorn with nutritional yeast, a vitamin-packed cheesy topping (spritzing the popcorn first with apple cider vinegar to get it to stick, of course), your urine stream can light up neon yellow like a light saber. This can give the false impression that your urine is more concentrated than it is and, hence, that you’re more dehydrated than you actually are.
