For many people, the day begins automatically—with an alarm, a glance at their phone, and perhaps a cup of coffee. However, in recent years, a simpler habit has gained popularity:   drinking water immediately after waking up  . Proponents claim it improves digestion, speeds up metabolism, flushes out toxins, improves skin health, and even promotes mental clarity.

But how much truth is there, how much is myth, and what does science really say?