This BBC Learning English podcast tackles the popular advice of drinking 2 liters of water each day, scrutinizing the scientific evidence behind this guideline. It traces the origins of this recommendation and reveals that it is based more on general advice than solid research. The discussion also highlights the signs of dehydration, such as fatigue and headaches, and how thirst is sometimes confused with hunger. Interestingly, the podcast notes that blood is about 90% water—much higher than the commonly thought 80%. Listeners will come away with a clearer understanding of their hydration needs and the shortcomings of popular health recommendations.
