JeffN wrote:although they do many things right, they do have an extremely high salt intake, several times higher than in the USA.
Is higher salt a reason for high strokes in China? Do we know their salt consumption when they had lower heart diease/strokes etc?
http://stroke.ahajournals.org/cgi/conte ... 26/12/2222
The geographic pattern of stroke and hypertension in the PRC is consistent with the "salt hypothesis," which proposes that high salt intake increases both the risk of hypertension as well as stroke. Several epidemiological studies have documented that dietary salt intake is higher in the north of the PRC than in the south.17 18 19 Tibet has the highest dietary intake of salt in the PRC, over 30 g (513 mmol sodium) per day per person, primarily in the form of salt-flavored tea.20 Tibetans also have the highest prevalence of hypertension, stroke incidence, and stroke mortality. In their study, Sasaki and colleagues21 found a positive ecological relationship between stroke mortality and mean 24-hour urinary excretion of sodium in 17 countries. In the WHO Cardiovascular Diseases and Alimentary Comparison Study, a multicenter epidemiological study conducted in 55 centers in 24 countries, stroke mortality was significantly and positively related to 24-hour sodium excretion in men across the centers.22
17 Huang ZD, Wu XG, Stamler J, Rao XX, Tao SC, Friedewald WT, Liao YL, Tsai RS, Stamler R, He HM, Zhou BF, Taylor J, Li YH, Xiao ZK, Williams OD, Chen RC, Zhang HG. A north-south comparison of blood pressure and factors related to blood pressure in the People's Republic of China: a report from PRC-USA collaborative study of cardiovascular epidemiology. J Hypertens. 1994;12:1103-1112.
18 Liu LS, Xie JX, Fang WQ. Urinary cations and blood pressure: a collaborative study of 16 districts in China. J Hypertens. 1988;6(suppl 4):S587-S590.
19 Tao SQ, Huang ZD, Lu CQ. Timed overnight urinary sodium, potassium and blood pressure in middle-aged men and women in urban rural populations in north and south China [in Chinese]. Chin J Cardiol. 1986;14:4-7.
20 Sun S. Epidemiology of hypertension on the Tibetan plateau. Hum Biol. 1986;58:507-515.
21 Sasaki S, Zhang XH, Kesteloot H. Dietary sodium, potassium, saturated fat, alcohol, and stroke mortality. Stroke. 1995;26:783-789.
22 Yamori Y, Nara Y, Mizushima S, Sawamura M, Horie R. Nutritional factors for stroke and major cardiovascular disease: international epidemiological comparison of dietary prevention. Health Rep. 1994;6:22-27.
Also, See figure 1
http://qjmed.oxfordjournals.org/cgi/con ... 93/8/557-a
http://www.scienceblog.com/community/ol ... 03668.html
In Japan also..
J Epidemiol Community Health. 1983 March; 37(1): 43â€“46.
Salt and geographical mortality of gastric cancer and stroke in Japan.
"Mortality rates of stroke were strongly correlated with salt intake in 12 regions (r = 0.85, p less than 0.001)"
Stroke 2004, vol. 35, no7, pp. 1543-1547
In men, the highest compared with the lowest tertile of sodium intake was significantly positively associated with death from total stroke after controlling for covariates (hazard ratio [HR]), 2.33; 95% CI, 1.23 to 4.45). Significantly positive associations were also observed between sodium intake and death from ischemic stroke (HR, 3.22; 95% CI, 1.22 to 8.53) as well as death from intracerebral hemorrhage (HR, 3.85; 95% CI, 1.16 to 12.7).
Conclusions-These prospective data support the hypothesis that dietary salt increases the risk of death from stroke.