[Sodium and hypertension].
Level 5 - mechanism / opinion, no new human data
Narrative review and historical overview without systematic review methodology or primary data
What was done
This is a narrative review synthesizing evolutionary history, animal experiments (in rats, dogs, rabbits, baboons, and chimpanzees), and human population studies to examine the relationship between dietary sodium intake, renal sodium handling, and essential hypertension.
What was found
The abstract states that ancestral human diets contained approximately 15 mmol/day of sodium (1 g salt) compared to modern intakes of approximately 150 mmol/day (9–12 g salt), and notes that populations consuming less than 60 mmol/day do not develop hypertension. Increased sodium intake is reported to raise blood pressure across multiple animal species and humans. Hypertensive rat strains and humans with essential hypertension share renal functional abnormalities that impair sodium excretion. No statistical effect sizes, variance measures, or primary trial data are reported in the abstract.
Why it matters
The paper outlines the conceptual framework linking modern high-salt diets to essential hypertension via evolutionary maladaptation and renal sodium retention mechanisms.
Limits
As a non-systematic narrative review, it presents no original empirical data, sample sizes, search strategy, or quantitative synthesis of study outcomes.
Cited by
- contradicts Average salt intake prior to refrigeration was approximately 15 grams per day without widespread hypertension, compared to modern intake of 6.9 grams per day with a 40% incidence of hypertension.