11-21-2004, 08:42 PM #1Associate Member
- Join Date
- Jan 2004
I had asked the question earlier, How many mg's of sodium a day is a safe amount? No one answered so I did a search on yahoo and this is what I found:
The Estimated Minimum Requirement of Healthy Persons for sodium from the National Academy of Sciences ranges from 120 mg/day for infants to 500 mg/day for adults and children >10 years. Recommendations for the maximum amount of sodium that can be incorporated into a healthy diet range from 2,400 to 3,000 mg/day or 6 to 7.5 grams of table salt/day. Individuals with hypertension should see their physician to determine if a sodium-restricted diet is appropriate for them.
Toxicity: Acute toxicity results in edema and hypertension and can cause death in an infant because of limited excretory ability of the immature kidney. However, sodium is generally nontoxic for healthy adult individuals because it is excreted readily in the urine. High salt intakes have been correlated with hypertension. Meta analyses suggest that a reduction in sodium intake of 2,300/day would lower systolic blood pressure by about 5-6 mm Hg and diastolic pressure by 1-2 mm Hg among hypertensives, who comprise a sizeable proportion of the US adult population. In addition, many who are not yet hypertensive respond to sodium reduction, particularly those whose blood pressure is in the high normal range. The expected impact of a similar reduction among the normotensive segment of the population is considerably smaller (1-2 mm Hg systolic and 0-1 mm Hg diastolic on average). Sodium reduction among normotensives is primarily designed to effect a downward shift in the average blood pressure in the population, with consequent impact in preventing a large number of cardiovascular disease deaths. High sodium intake or intake of highly salted foods may also be related to asthma, to urinary calcium
Recent research: Phase I of the Trials of Hypertension Prevention (a multicenter, randomized controlled trial) demonstrated, over an 18 month period, the ability of moderate sodium reduction (from 155 to 100 mmol per day) to lower the mean systolic and diastolic blood pressure of 30-54 year old adults who had a high normal diastolic blood pressure at the time of enrollment. This group average blood pressure resulted in a 25% reduction in the number of individuals who developed high blood pressure during the study period. The Trials of Hypertension Prevention, Phase II, included a test of the ability of sodium reduction (without weight loss) to lower mean systolic and diastolic blood pressure in a group of adults who were overweight, over a longer follow up period (36-42 months). Compared to the usual care group (n=596), the chances of developing hypertension were lower in those assigned to sodium reduction (n=594) compared to those assigned to usual care (no dietary intervention) (relative risk or RR) for sodium versus usual care = 0.61, p=.04 at 6 months; RR=0.88; p=0.28 at 18 months; RR=0.88, p=0.09 at 36 months, and RR=0.86, p=.04 for those followed through 48 months. Urinary sodium excretion data collected at each time point suggest that the smaller effect on blood pressure from 18-months on reflects the difficulty in achieving sufficient long term adherence to sodium reduction.
What do you guys think? SHould it be even lower since we are on AS?
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