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It is said that after dinner or after lunch , one should not take a cold water bath.  Due to the cold water flowing on the body, the blood circulation increases around the body near the skin.  This reduces the blood flow in the stomach. So digestion process is affected.

Also, cooling the body by taking bath is not good,  when energy is being produced by the metabolism inside the body and when body is being warmed.  One can experience it by oneself easily, it feels strange.
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After consuming food the stomach and the juices in the stomach need the circulation of blood in the body because if there is no supply of blood, the digestive juices don't function and that leads to stomach pain. So if you move around after eating food leads to stomach pain.If You take bath in cool water the hot food which you have eaten reacts to the cold temperature which also is not a good thing.
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