Too Much Protein Can Lead to Dehydration, Researchers Find


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Too Much Protein Can Lead to Dehydration, Researchers Find
By Janice Palmer

The more protein you eat the more water you should drink, according to a study
by UConn's Department of Nutritional Sciences.

William Martin, a second-year graduate student studying with Nancy Rodriguez, an
associate professor of nutritional sciences, presented the research last week at
the 11th annual Experimental Biology meeting in New Orleans.

As part of the study, five UConn student athletes who are runners consumed low,
moderate and high amounts of protein for four weeks at a time. Their meals were
carefully planned and scrutinized by Rodriguez, the lead investigator, who
worked with University Catering Services to provide the special meals. The
hydration status of the athletes was evaluated bi-weekly.

"We found that certain hydration indices tended to be influenced as the amount
of protein in their diets increased," says Rodriguez, who also holds joint
appointments in kinesiology and allied health.

When the athletes consumed the highest amounts of protein, their blood urea
nitrogen (one of several clinical laboratory tests used in evaluating kidney
function) reached abnormal ranges. This value returned to normal when protein
intake was reduced. Other tests indicated that the high protein diet caused the
kidneys to produce more concentrated urine.

The recommended daily protein intake for the average person is set by the U.S.
Department of Agriculture and it is dependent on body weight. The recommended
daily allowance (RDA) for an individual weighing 150 pounds is 70 grams of
protein, which can be easily obtained in a diet including two glasses of milk,
three to four ounces of chicken, and a bowl of cereal, rice or pasta. In this
study, the low protein diet nearly equaled the RDA. The moderate diet included
more than two times the recommended protein intake (which is typical of the
general population), and the high protein diet incorporated a little more than
four times the suggested level.

"Based on our findings, we believe that it is important for athletes and
non-athletes alike to increase fluid intake when consuming a high protein diet,
whether they feel thirsty or not, because our study subjects said they did not
feel a difference in thirst from one diet to the next," says Rodriguez. She
received funding for this study from National Cattlemen's Beef Association and
the University of Connecticut's Research Foundation.

For most people, just a 2 percent decrease in body fluid can negatively affect
performance and cardiovascular function. Keeping in mind that the average adult
should be drinking eight to 10 glasses of water each day, Rodriguez recommends
that those who are exercising and/or eating high amounts of protein increase
their fluid intake and avoid excessive amounts of caffeine or any other agent
that acts as a diuretic.

For this study, Rodriguez and her team worked closely with Carl Maresh and Larry
Armstrong, professors of kinesiology who are experts in the fields of
thermoregulation and human performance.