How many glasses of water a day?

A place to get your questions answered from McDougall staff dietitian, Jeff Novick, MS, RDN.

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Re: How many glasses of water a day?

Postby JeffN » Mon Aug 24, 2015 7:54 am

As an addendum...

Food can make a large contribution to our daily water needs.

The beauty of learning, understanding and implementing the principles of calorie density are

1) the lifetime management of our weight is now in our control

2) the foods low in calorie density are also higher in nutrient density so we are assured nutritional adequate diets

3) the foods low in calorie density are also higher in water content so we make a huge contribution to our daily water needs from the best source possible.

In Health
Jeff
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Re: How many glasses of water a day?

Postby JeffN » Sun May 27, 2018 8:39 am

The Hydration Sweet Spot - Importance of Aquaporins
Clinical laboratory science: journal of the American Society for Medical Technology
29(3):186-193 · September 2016

https://www.researchgate.net/publicatio ... Aquaporins

How Much Water do we Need?
Because water is essential to life, evolutionary pressures to maintain water balance and preserve osmolality are encoded within the DNA of all vertebrates (and some invertebrate) species.52 The amount of water that each individual needs at any given time, in any situation, is centrally dictated in real-time by linear alterations in the physiological sensation of thirst in response to often subtle changes in plasma osmolality.5,6 The more water that the body needs, the thirstier animals become (and vice versa).5 The dire consequences associated with both underdrinking and overdrinking have been sensationalized and are rare. However, misguided drinking (not in response to thirst) can have fatal consequences if unexpected variables (heat, stress, infection, drugs, getting lost in the desert or at sea) exceed maximum compensatory capabilities associated with habitual tendencies (often from well- intentioned advice). Therefore, hydration advice should be simple: drink to thirst. Any overshoot or under-replacement of fluid will be continuously corrected, without conscious thought, by millions of renal aquaporin channels shuttling in and out of luminal kidney collecting duct cells, as orchestrated by vasopressin. So, why not trust in our physiology?
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