You can have one glass of iced coffee
per day but should take care not to go
over your
caffeine intake with other drinks if you do so.
One measured fluid, electrolyte, and renal indices of hydration
over eleven
days of
caffeine consumption in human subjects, finding that doses of up to 6 mg
caffeine per kilogram of body weight had no effect on body mass, urine osmolality (urine concentration), urine specific gravity (concentration of excreted materials in urine), urine color, urine volume, sodium excretion, potassium secretion, creatinine content, blood urea nitrogen (forms when protein breaks down), and serum levels of sodium and potassium.