India, March 8 -- I f you've walked into a gym or scrolled through social media lately, you would have seen it: water that isn't just water. It's pink, it's bubbly, and it's packed with powders. Water stacking aims to make drinking water tasty and nutritious to increase intake, by adding flavourings, electrolytes packets, chia seeds, collagen, and vitamins. But while the trend looks cool, experts urge caution. Dr Sunil Rana, associate director and head of internal medicine (Unit III) at Asian Hospital, explains that the body has strict built-in limits. "Water-soluble nutrients like many electrolytes are simply excreted in urine if you don't need them. Collagen is just a form of protein, and your body breaks it down like any other protein. Unless someone has a deficiency or heavy sweat losses, they're often just exceeding what their body can actually use." Dr Rakesh Pandit, senior consultant and HOD, internal medicine at Aakash Healthcare, agrees: "In most healthy people who eat a balanced diet, adding collagen, electrolytes, and other powders to one glass of water doesn't provide dramatic extra benefits. If you're not deficient, excess water-soluble nutrients are simply flushed out."...