Completely different topic, but I believe they found the same thing with the classic "You should drink 8 glasses of water a day". There is no basis for this. It may be a good idea, but there is no data which supports that number. It's just something people say.
A lot of what passes for science isn't science.
The New England Journal of Medicine printed the “8 glasses of water a day” line in a study they did. It went on to point out that anything with water in it can be counted. Juices, coffee, tea and even cokes. But for some reason that part was never reproduced. Probably omitted by anti-capitalists. And as you know, doctors believe anything they read but they don’t read everything. They’re still pushing the low fat diet crap.
I recently had a urologist tell me 64 oz of water a day is way too much.
Other than the occasional sip from the school drinking fountain, I don't recall EVER drinking water at home.
We had our own well and it was iron water.....awfull tasting stuff.