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From Anas: "The Prophet (ﷺ) prohibited that a man should drink while standing." (Qatadah said:) So it was said: "And eating ?" He (Anas) said: "That is worse."
[Abu 'Eisa said:] 
[Jami` at-Tirmidhi 1879]
Modern science gives several health reasons why drinking water while sitting can be beneficial.  
When you drink water while sitting, the nutrients reach the brain and boost its activity. If you drink water while standing, it risks your lungs and heart.
Alhamdulillah, we are proud to be  Muslim, as our Prophet Muhammad PBUH taught us the same 1400 years ago. Now science repeats his theory. Subhan Allah