From my link, Cold water is not as good for hydration as room temperature. The theory is that the cold water causes the blood vessels surrounding stomach to shrink, slowing absorption
So who is right FE?
In most modern big city pubs you have a choice of 'normal' or 'ice cold' lagers...I usually select 'ice cold' on hot summer days and 'normal' on cold winter evenings...on days when we have 4 seasons in one day...I have a cup of coffee ;o]
Who is right? I don't know, which is why I said the answer isn't straightforward.
What I do know is that The American College of Sports Medicine recommends that all drinks used during exercise be chilled. Research has shown that chilled water passes through the stomach much more quickly than drinks consumed at room temperature, and cold water rehydrates you quicker after strenuous exercise.
That's a good answer but leaves me puzzled. If chilled water passes through the stomach faster than room, or ambient temperature, water then the stomach surely digests, or absorbs, less of it to hydrate the body and then the kidneys and liver removes it in a purer form or water rather than urine?