Dear Sri. Prasad, Greetings. That TOI article is slightly misleading. Even amoung sports persons, marathon runners require special requirements. Clubbing examples from that category to the general public is very much almost pre meditated misleading. In general, when the kidneys fail to excrete water, fluid build up can happen; also when lymphatic system is not up to scratch, fluid build up occurs. Otherwise excess water drinking would only lead to frequent trips to urinals. That's all. Body has it's own mechanism to retain minerals in the body. Here is some info on hyponatremia - Hyponatremia - PubMed Health Cheers!