[seniour_baloch]

My father always instructed me not to drink water immediately after taking tea! When I asked him the reason I never received the appropriate answer! Is there anything bad to mix tea and water in stomach or its just a myth?
Thank You!

[Dan]

What is the main ingredient in tea?

[billnotgatez]

There is a belief that COLD water just after HOT tea may cause some negative effects on your body.
But, COLD water after COLD tea is OK.
I assume following this logic HOT water after HOT tea would be OK as well.
I could not GOOGLE any scientific literature to support the claims.

[Arkcon]

These sorts of old wives tales, or since this is your dad, folk logic often have a grain of truth in them.  But its very difficult to find what that truth is -- given that you "just shouldn't" with no explanation of what will happen. 

Consider:  you've mixed a cup of tea and a cup of water, into your stomach, which has a fixed capacity that you can find on Google.  Eventually the contents are diluted across your entire mass of 90 kg.  What happens when you dump a cup of tea and a cup of water in a bowl?  When you dump it into a bathtub?  You can try to replicate the existing environment: have 0.1 M HCl there to mimic stomach contents.  This is commonly done to determine dissolution of pharmaceuticals -- we can replicate stomach contents with HCl, pepsin, deoxygenated water at 38 ° C, mucus -- even mammal digestive juices if the experiment requires it.  What reaction can we possible expect from mixing tea, dissolved in water, with more water?  What will we test for?

[seniour_baloch]

To some extent I have got an idea but still I am not clear that what could be the damaging results, if any, by doing so?