As the amount of protein consumed went up, the degree of hydration progressively went down. During the period in which athletes were consuming the highest amounts of protein, their blood urea nitrogen (BUN) - a clinical test for proper kidney function - reached abnormal ranges. Other tests indicated that the high protein diet caused the kidney to produce a more concentrated urine. The researchers believe the bottom line is clear for athletes and non-athletes alike: when consuming high protein diets, increase your fluid intake, whether you feel as if you need to or not. The athletes in this study reported no difference in how thirsty they felt and consequently they did not drink more liquid from the low to high protein diets. Athletes or extremely active people may also want to monitor hydration status.

In fact, say the researchers, you might want to drink more water regardless of your diet. It has been estimated that three of every four Americans are chronically dehydrated, placing themselves at increased risk for heat illness and other health problems. As little as a two to three percent decrease in body water has been found to negatively affect performance and cardiovascular function.

Source:sportsmedicine.about.com/od/sportsnutrition/a/proteindehydrat.htm]High Protein Diets Cause Dehydration

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