Sleep regularity is a stronger predictor of mortality risk than sleep duration

Re:Sleep regularity is a stronger predictor of mortality ris... by petilon on Wednesday July 15, 2026 @10:03AM (#48920993)

Blood tests are pretty useless for magnesium. The deficiency is in cells, magnesium level in blood is not a good test for that deficiency.

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Re:Sleep regularity is a stronger predictor of mortality ris... by orionsbelt on Wednesday July 15, 2026 @10:11AM (#48921127)

They have blood tests for both (serum or RBC):

The Magnesium RBC Test measures magnesium inside red blood cells, providing a more accurate assessment of magnesium status than serum tests.

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Re:Sleep regularity is a stronger predictor of mortality ris... by m_mueller on Wednesday July 15, 2026 @10:14AM (#48921163)

wouldn't a cell deficiency lead to it depleting also the magnesium levels in the blood, simply based on osmosis?

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Re:Sleep regularity is a stronger predictor of mortality ris... by manoDev on Wednesday July 15, 2026 @10:27AM (#48921364)

The organism dumps Mg on the blood as much as necessary because it needs to remain in stable concentrations.

When a serum Mg test comes out low, the patient already has severe deficiency and visible symptoms, so isn’t very useful unless you’re investigating a systemic issue.

As explained by my endocrinologist.

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Re:Sleep regularity is a stronger predictor of mortality ris... by stouset on Wednesday July 15, 2026 @11:16AM (#48922164)

If blood concentrations drop, you die.

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Re:Sleep regularity is a stronger predictor of mortality ris... by allannienhuis on Wednesday July 15, 2026 @10:13AM (#48921149)

what is a good test for magnesium deficiency?

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Re:Sleep regularity is a stronger predictor of mortality ris... by petilon on Wednesday July 15, 2026 @10:15AM (#48921178)

They only have blood tests, and that's not very useful.

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