To test dehydration, 59 physically fit males were given 246 mg of caffeine per day for six days. After the six-day equilibrium period, the men were split into three groups and embarked upon a five-day test period. The first group was given double the amount (492 mg) of caffeine per day, the second group acted as the control group and kept receiving the same 246 mg per day, while the third group's caffeine intake was dropped to zero.
RESULTS: Results showed no sign of a negative fluid-electrolyte imbalance in any of the test groups
MY COMMENT: As the article states, "the key to caffeine consumption is moderation"