Sodium question

[landog]

Hi Jeff,

I've been revisiting the "Is it time to end the war on salt" topic. Thanks for all the work that you put into it - I really appreciate it.

I have a question, though...

In this response, you state: "Serum sodium...is not directly related (to) dietary sodium intake"

Yet, in this post, under this section:
(6) E- Postprandial effects of a high salt meal on serum sodium

"The aim of the study was to determine if a high salt meal containing 65 mmol Na causes a rise in sodium concentrations "

"CONCLUSIONS: A meal containing 65 mmol Na increases serum sodium"

So, is salt consumption somewhat related to serum sodium?

[JeffN]

Hey Marty!

Let’s put this in perspective with a few key points….

- If you look at your latest blood test, you will see the range of sodium considered normal is 134-144 mmol/L

In the study....

- the high sodium group get a meal with 65 mmol sodium, which equals 1,500 mg of sodium, which is the Adequate Intake (AI) for the day. So, they got a days worth of sodium at once to see if it had an a impact.

- the baseline levels of sodium were 139.6 for Low Sodium Group and 139.5 for High Sodium Group

- The high sodium meal increased serum sodium concentration within 60 min compared with the low sodium meals. The High Sodium groups level went from 139.5 to 141, and the Low Sodium groups went stayed at 139.6 

Consuming a full days worth of salt in one meal and having serum sodium go up 1.5 mmol/L is not significant in anyway or really moving serum sodium level. In fact, it could be considered in the “error range”.

The study goes on to say….

“This study used an amount of sodium-chloride typical of that in current foods and single meals consumed in developed countries [31].However, to produce a change in serum sodium concentration of the magnitude observed in vitro studies it may not be physiologically possible with oral sodium loading alone, without adverse effects (e.g. nausea and vomiting). …..Compensatory mechanisms stimulated when serum sodium is raised

Not only is it not physiologically possible to make your serum sodium move, to do so would cause adverse effects and trigger compensatory measures to even prevent it happening

Let’s put this in another perspective, If you ate a whole days amount of food at once and your LDL went from 65-66.5 would you consider that an impact or relevant?

If you have hypo-natremia or hyper-natremia, it is not because of the salt in your diet.



In Health
Jeff

[Vegan]

Jeff,

Is your 1200mg max per day sodium recommendation the same for every single adult? For 100lbs woman and 275lbs male?

[JeffN]

My recommendation is a range but all recommendations must be applied to the individual and their situation.

This may help…


https://www.drmcdougallforums.com/viewt ... 22&t=57151

I think shooting for 500 to 1000mg sodium daily is likely a safe and effective target for most people to avoid elevated BP/HTN who want to control their BP without drugs.

The 1500 is the Adequate intake which is actually 1200-1500 depending on age and health. "The Adequate Intake (AI) is set instead of an RDA if sufficient scientific evidence is not available to calculate an EAR. The AI is based on observed or experimentally determined estimates of nutrient intake by a group (or groups) of healthy people." The AHA, ACC, NHLB, etc all use the 1500 too.

https://www.nap.edu/read/10925/chapter/8#270

"The AI for sodium is set for young adults at 1.5 g (65 mmol)/day (3.8 g of sodium chloride) to ensure that the overall diet provides an adequate intake of other important nutrients and to cover sodium sweat losses in unacclimatized individuals who are exposed to high temperatures or who become physically active as recommended in other dietary reference intakes (DRI) reports. This AI does not apply to individuals who lose large volumes of sodium in sweat, such as competitive athletes and workers exposed to extreme heat stress (e.g., foundry workers and fire fighters). The AI for sodium for older adults and the elderly is somewhat less, based on lower energy intakes, and is set at 1.3 g (55 mmol)/day for men and women 50 through 70 years of age, and at 1.2 g (50 mmol)/day for those 71 years of age and older. "

The 2300 is the Tolerable Upper Limits. This is defined as "The highest level of nutrient intake that is likely to pose no risk of adverse health effects for almost all individuals in the general population. As intake increases above the UL, the risk of adverse effects increases."

In health
Jeff

[landog]

If you have hypo-natremia or hyper-natremia, it is not because of the salt in your diet.



In Health
Jeff

Thanks, Jeff!