The short answer is "no, not if you're used to it." It is a common misconception that coffee should be avoided as a fluid replacement under the belief that caffeine is a diuretic. The diuretic effect of caffeine was originally examined on acute studies in caffeine naïve individuals, see references i, ii, iii, iv, v, vi, vii. However research shows that a tolerance to caffeine develops, see references viii, ix, x, xi, xii. As such those who are not caffeine naïve, i.e. regularly ingest caffeine, do not experience an increased urine output or altered conditions of hydration status after consuming caffeinated beverages, see references xiii, xiv.
i. Ballet S, et al (1969) Effect of coffee ingestion on catecholamine release. Met 18; 288-291
ii. Dorfman LJ, Jarvik ME (1970) Comparative stimulant and diuretic actions of caffeine and theobromine in man. Clin Pharmacol Ther 11; 869-872
iii. Massey L, Wise K (1984) The effect of dietary caffeine on urinary excretion of calcium, magnesium, sodium and potassium in healthy young females. Nutr Res 4; 43-50
iv. Neuhäuser-Berthold M, et al (1997) Coffee consumption and total body water homeostasis as measured by fluid balance and bioelectrical impedance analysis. Ann Nutr Met 41; 29-36
v. Passmore AP, et al (1987) Renal and cardiovascular effects of caffeine: a dose-response study. Clin Sci (London) 72; 749-756
vi. Robertson D, et al (1978) Effects of caffeine on plasma rennin activity, catecholamines and blood pressure. NEJM 298; 181-186
vii. Wemple R, et al (1997) Caffeine vs caffeine-free sports drink: effects on urine production at rest and during prolonged exercise. Int J Sports Med 18; 40-46
viii. Colton T, et al (1968) The tolerance of coffee drinkers to caffeine. Clin Pharmacol Ther 9; 31-39
ix. Denaro C, et al (1991) Effects of caffeine with repeated dosing. Eur J Clin Pharmacol 40; 273-278
x. Goldstein A, et al (1969) Psychotropic effects of caffeine in man. IV. Quantitative and qualitative differences associated with habituation to coffee. Clin Pharmacol Ther 10; 489-497
xi. Myers M, Reeves R (1991) The effect of caffeine on daytime ambulatory blood pressure. Am J Hypertens 4; 427-431
xii. Robertson D, et al (1981) Tolerance to the humoral and hemodynamic effects of caffeine in man. J Clin Invest 67; 1111-1117
xiii. Grandjean AC, et al (2000) The effect of caffeinated, non caffeinated, caloric and non-caloric beverages on hydration. JACN 19; 591-600
xiv. Armstrong LE (2002) Caffeine, body fluid-electrolyte balance, and exercise performance. Int J Sport Nutr and Exer Met 12; 189-206
Caffeine.
It contains caffeine, which is a diuretic and a stimulant. It works by blocking sleepy signals to the brain; thus decreasing your tiredness.
Caffeine has two major effects on the human body. One, it acts as a stimulant, ramping up heart rate, dilating blood vessels, etc. Two, it acts as a diuretic, causing the kidneys to put more water into the urine than normal, filling the bladder faster. Caffeine does make you pee more often than if you drank decaf beverages. Try it some time: drink caffeine free alternatives for a day, and see how your bathroom time compares. Excess or just a little bit, caffeine will make you pee.
Caffeine is a diuretic, so yes.
Caffeine is a diuretic which causes you to lose more fluid from the tissues.
Caffeine speeds up your heart rate, as both a stimulant and a diuretic
Because it is a diuretic and can cause dehydration.
Alcohol
Caffeine is a naturally occurring compound and acts as a stimulant as well as a diuretic. Calcium (Ca) is an element (20 in the periodic table) and is used in bone and shell growth in many animals as well as assists in cell signaling.
Inhibition of ADH release
Caffeine is a diuretic so it would be better not to have it.having plenty of fluids is important when you have a fever
Yes, because it contains caffeine which is a diuretic.