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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Re: How many glasses of water a day?

Postby JeffN » Tue Oct 04, 2022 7:43 am

Your Body Has a Clever Way to Detect How Much Water You Should Drink Every Day
One brain region combines signals from your mouth, gut and blood
By Claudia Wallis on September 1, 2022

https://www.scientificamerican.com/arti ... every-day/

"The big takeaway of Zimmerman's work is that for the most part you can trust your thirst system to tell you when you need to drink, as opposed to following some arbitrary advice. But there are exceptions. Because the system's sensitivity may decline with age, older adults may need to set reminders to drink—the 2013 study found that, on average, people older than 70 failed to get adequate hydration. People with certain conditions, including kidney stones and diarrhea, also need extra water. And research by Davy and others indicates that middle-aged and older people who are trying to lose weight or maintain weight loss consume fewer calories if they fill up with 16 ounces of water before meals.

Other parts of the brain—the ones used in planning—should help with hydration on hot days and when exercising. Thirsty or not, Zimmerman says, he drinks water before going for a run: “My thirst neurons don't know I'm about to run 10 miles.”
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