Coffee intake may have a diuretic effect in increased urinary secretion, a recent study by a renowned institute suggested
Coffee, a popular and social beverage all over the world, particularly in the West, is a drink made from roasted bean from the Coffea plant, native to tropical Africa and Madagascar.
In an observation study of 10 healthy adults (eight males and two females; age: 27 ± 5 years, weight: 89.5 ± 14.8 kg, height: 1.75 ± 0.08 m, and body mass index: 29.1 ± 4.4 kg m-2) ingested either 200 mL of water (W), or coffee with low caffeine (3 mg kg-1, LCAF), or coffee with high caffeine (6 mg/ kg, HCAF) on three respective separate occasions, researchers found that group injected with high caffeine coffee with (6 mg kgHCAF)demonstrated a greater diuresis during the 3-h period in compared to groups treated with W (356 ± 53 mL) and LCAF.
Furthermore, volume of urinary secretion of the injection of coffee with high caffeine groups HCAF was 425 mmol in compared to groups injected with W of 249 mmol) and LCAF of 177 mmol.
Dr.Seal AD1, the lead author siad, " caffeine intake of 6 mg/kg in the form of coffee can induce an acute diuretic effect, while 3 mg/kg do not disturb fluid balance in healthy casual coffee drinking adults at rest".
Additionally, in the review of literature by searching the Medline database of articles published in the medical and scientific literature for the period of January 1966-March 2002, Dr. Maughan RJ, the lead author said, " acute ingestion of caffeine in large doses (at least 250-300 mg, equivalent to the amount found in 2-3 cups of coffee or 5-8 cups of tea) results in a short-term stimulation of urine output in individuals who have been deprived of caffeine for a period of days or weeks".
Interestingly, in a counterbalanced cross-over design, 50 male coffee drinkers (habitually consuming 3-6 cups per day) participated in two trials, each lasting three consecutive days, with controlled physical activity, food and fluid intake, participants also consumed either 4×200 mL of coffee containing 4 mg/kg caffeine (C) or water (W), researchers filed the following results
1. Intake of coffee during this period showed no significant changes in total body water (TBW) with no differences between trials.
2. Volume urinary secretion showed no difference in the period of examination and between 2 groups.
3. No change of nude body mass measurement (BM) in the period and between 2 groups.
Dr. Seal AD, the lead author said, " (there were) no significant differences across a wide range of haematological and urinary markers of hydration status between trials".
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Some articles have been used as references in medical research, such as international journal Pharma and Bio science, ISSN 0975-6299.
(1) Coffee with High but Not Low Caffeine Content Augments Fluid and Electrolyte Excretion at Rest by Seal AD1, Bardis CN2, Gavrieli A2, Grigorakis P2, Adams JD1, Arnaoutis G2, Yannakoulia M2, Kavouras SA1,3(PubMed)
(2) No evidence of dehydration with moderate daily coffee intake: a counterbalanced cross-over study in a free-living population by Killer SC1, Blannin AK1, Jeukendrup AE1.(PubMed)