Second pass at: Sodium, potassium and magnesium when intake drops

Second pass at: Sodium, potassium and magnesium when intake drops Writing it up because I had to work it out twice and would rather nobody else did.

A hydration and intake question, with the figures, since this one is unanswerable without them.

Fluid intake over a day, roughly, plus what I take with it and when. Intake is down substantially on where it was, which I gather is the ordinary consequence of eating much less rather than anything else.

What I would like to understand is which of the symptoms attributed to this are plausibly about fluid and salt, and which are being attributed there because it is the easy explanation.

I read the opening post twice before replying, because I had assumed the opposite.

Where a laboratory result exists, quoting it with the reference interval makes the discussion tractable. Without it the thread is guesswork.

I would be glad to be shown a cleaner way of putting this.

Magnesium supplementation is widely recommended in this space with very little supporting evidence for the indications it is recommended for.

The part I am sure of is shorter than the part I have written.

Orthostatic symptoms: dizziness on standing after lying down can indicate dehydration or electrolyte depletion. Increasing fluids, salt, and potassium usually resolves it.

Second-hand, so weight it accordingly.

Taking post #76 at face value and following it one step further.

Magnesium: deficiency during weight loss is common and symptoms (fatigue, muscle cramps) are nonspecific. Supplementation is inexpensive and low-risk if needed.

Coming back to post #79, because the follow-up matters more than the original answer.

The very ordinary causes of week-two malaise: inadequate hydration, low sodium intake, too-rapid calorie deficit, and inadequate sleep are more common causes of fatigue and malaise than compound toxicity.

Supplementing without measuring is the default approach described here and it carries its own risks, particularly for potassium.

The general case is well covered; this is the awkward specific one.

What I would want before treating Sodium as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three are usually missing.

I had written a reply contradicting post #128 and deleted it. Here is what survived.

Very low total intake produces multiple simultaneous deficiencies rather than one, which is why single-nutrient reasoning goes wrong here.

Written from notes rather than memory, which is why the numbers are specific.