Hi,
Your stomach and spleen meridians like to be warm. Some people will actually experience a mild stomach ache or indigension from making their stomach/spleen too cold (also from wrong foods).
It is at least correct to say, your body is wasting energy in warming the cold water to body temperature. Then also it can be a shock. Finally it is best for your spleen and stomach to not expose it to cold drinks or herbs unless you have a stomach/spleen heat problem. I'm assuming you're healthy, so I'd suggest just avoid cold drinks because it is simply better for you to do so.
