Tuesday, April 29, 2014
Is it true that coffee causes dehydration?
The School of Sport and Exercise Sciences of the University at Birmingham, UK after conducting a tremendously thriving research has come to this conclusion - that drinking coffee daily in moderation, does not lead to dehydration in adult young men. It is found that fluid balances in the body remains at par between coffee and water intake. The research shows that although heavy coffee intake causes dehydration, but in moderate quantities, it provides the same hydration as water.
Studies show that 60% of the adult male human body is made up of fluid depending on age, health status and gender. A variety of hormones regulate proper organ functioning along with consumed fluids that help hydrating body tissues. Loss of body mass causes dehydration and that is why, the European Food Safety Authority (EFSA) instructs at least 2.5 litres of water intake per day for adult male as the minimum.
Researches show that moderate coffee drinking does not cause dehydration
Scientific forums have been consistently putting forth theories and adaptation on whether beverages containing caffeine, such as coffee, causes dehydration if consumed on a moderate level (100-140 mg caffeine) everyday. Caffeine delays the action of hormones responsible for fluid balance control causing a diuretic loss if consumed heavily and is majorly noticed among people who do not regularise in caffeine intake. However, it is not clear whether the body gets used to caffeine exposure and if the diuretic effect gets reduced. In that case, drinking coffee would add to keeping the body hydrated instead of the other way around.
The process of the research:
The research constituted of cross-over study of 50 healthy males in random (average age 28 years), who drink 3-4 cups of coffee every day. The study was divided into two parts, first where four 200 millilitres (ml) cups of coffee (controlled-strength, containing 4 mg of coffee per kilogram of body weight) was provided. In the other, which was the control, it consisted of four 200 ml cups of water. After a continuation of ten days normal wash-out, the process was alternated. While on the research, each participant was under a controlled diet based on their food and fluid consumption patterns. Food diaries maintained by the participants helped to analyse their consumption during the research. Simultaneously, the condition of body hydration was analysed using a double- labelled water method which helps measure fluid fluctuation in the body. The blood and urine tests provide hydration levels after which body mass is checked.
Outcome of the research:
The non-significant change in the total fluid balance between coffee and water consumption, concluded that the intake of coffee and dehydration on its average intake was irrelevant. Although there was a 0.2% body weight fluctuation during the three days of research, it is definitely not relatable to the coffee intake. Besides higher sodium content in excretion during coffee consumption days of the research, no other noticeable difference could be gathered between coffee and water consumption.