Intersalt study

Table salt, crystals

The INTERSALT Study was a 1988 international observational study which investigated the link between dietary salt, as measured by urinary excretion, and blood pressure. The study was based on a sample of 10,079 men and women aged 20–59 sampled from 52 populations around the world. The authors of the study provided a widespread international investigation of the correlation between dietary salt intake and blood pressure in a systematic and standardized way with regards for relevant confounding variables, beyond just age and sex.[1]

## Results

The study found a significant direct relationship between dietary salt intake, the urinary sodium:potassium ratio and systolic blood pressure, and between salt intake and the slope of blood pressure with age – both for all 52 populations, and for 48 populations excluding four low-sodium populations (Yanomamo and Xingu Indians of Brazil, Papua New Guinea and rural Kenya).[1]

## Reception

The results were disputed by the Salt Institute (the salt producers' trade organisation, since disbanded), who demanded that the results be handed over for re-analysis.[2] A re-analysis was published in 1996 and the results were the same.[3] The results have since been confirmed by the TOHP I and TOHP II studies,[4] trials of salt reduction and blood pressure in chimpanzees,[5][6] meta-analyses of the human clinical trial data[7] and the SSaSS trial of salt substitute and cardiovascular disease.[8]

## References

1. ↑ 1.0 1.1 Intersalt Cooperative Research Group (1988). "Intersalt: an international study of electrolyte excretion and blood pressure. Results for 24 hour urinary sodium and potassium excretion". Br Med J 297 (6644): 319-28. doi:10.1136/bmj.297.6644.319. PMID 3416162.
2. ↑ Godlee F (2007). "Editor's choice: Time to talk salt". Br Med J 334 (7599): 0. doi:10.1136/bmj.39196.679537.47.
3. ↑ "Intersalt revisited: further analyses of 24 hour sodium excretion and blood pressure within and across populations. Intersalt Cooperative Research Group". Br Med J 312 (7041): 1249-53. 1996. doi:10.1136/bmj.312.7041.1249. PMID 8634612.
4. ↑ "Long term effects of dietary sodium reduction on cardiovascular disease outcomes: observational follow-up of the trials of hypertension prevention (TOHP)". Br Med J 334 (7599): 885-8. 2007. doi:10.1136/bmj.39147.604896.55. PMID 17449506.
5. ↑ Elliott, Paul; Walker, Lesley L.; Little, Mark P.; Blair-West, John R.; Shade, Robert E.; Lee, D. Rick; Rouquet, Pierre; Leroy, Eric et al. (2 October 2007). "Change in Salt Intake Affects Blood Pressure of Chimpanzees: Implications for Human Populations". Circulation 116 (14): 1563–1568. doi:10.1161/CIRCULATIONAHA.106.675579.
6. ↑ Denton, Derek; Weisinger, Richard; Mundy, Nicholas I.; Wickings, E. Jean; Dixson, Alan; Moisson, Pierre; Pingard, Anne Marie; Shade, Robert et al. (October 1995). "The effect of increased salt intake on blood pressure of chimpanzees". Nature Medicine 1 (10): 1009–1016. doi:10.1038/nm1095-1009.
7. ↑ Aburto, N. J.; Ziolkovska, A.; Hooper, L.; Elliott, P.; Cappuccio, F. P.; Meerpohl, J. J. (3 April 2013). "Effect of lower sodium intake on health: systematic review and meta-analyses". BMJ 346 (apr03 3): f1326–f1326. doi:10.1136/bmj.f1326.
8. ↑ Neal, Bruce; Wu, Yangfeng; Feng, Xiangxian; Zhang, Ruijuan; Zhang, Yuhong; Shi, Jingpu; Zhang, Jianxin; Tian, Maoyi et al. (16 September 2021). "Effect of Salt Substitution on Cardiovascular Events and Death". New England Journal of Medicine 385 (12): 1067–1077. doi:10.1056/NEJMoa2105675.

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