Last Monday the USDA released its latest version of the Dietary Guidelines for Americans (nominally dated “2010”). I was driving home and NPR carried USDA Secretary Tom Vilsack’s speech, in which he listed a few of the new highlights: eat less, eat less food with solid fats, eat less processed food, eat more vegetables and fruits, eat less sodium.
How much less sodium? About 2300 mg or 6 grams (1 teaspoon) of table salt per day, he said, is the recommended maximum for healthy adults, in line with the long-standing National High Blood Pressure Education Program’s guidelines, which are shared by the American Heart Association and many other professional medical groups.
There’s a second lower-sodium recommendation for anyone overweight, African-American, with heart or kidney disease or high blood pressure or diabetes, and anyone middle-aged or older. This year, as the more specifically heart-health-oriented professional organizations already recommend, the USDA guidelines set the lower maximum at 1500 mg per day, or about 3 grams of table salt.
And you’d think that was great, and I do, that the USDA guidelines have finally caught up with what the medical associations have been demanding based on the overwhelming weight of studies on dietary sodium intake as it affects blood pressure, cardiovascular disease including stroke, and kidney disease.
But there are two catches hidden in the midst of all this, and I’m not even sure Vilsack was aware of it. Smaller one first: Middle-aged? How old is middle-aged?
“Fifty-one and older,” Vilsack said. Whew, I thought. Four more years before I have to start thinking of myself as middle-aged. By the time I get there, I’m hoping the standard will have gotten fudged upward by at least another decade or so.
Because, you know, if you’re not 50 yet, 51 sounds reasonable–and comfortably remote for a lot of younger adults. Which I am, thank you very much. Don’t look at me like that.
So here’s Catch-51: When I was working at the National Heart, Lung and Blood Institute back in the mid-’90s, the general working recommendation for lowering sodium to 1500 mg/day was all the other high-risk groups Vilsack mentioned…and healthy adults 40 and up. Not 51 and up.
The choice of a cutpoint at age 40 for otherwise healthy people was based on the risk data from the first three National Health and Nutrition Education Surveys, which began collecting data across the nation starting in the 1970s. The latest version collected data around 2006 and its findings were just released last spring by the Centers for Disease Control. All the NHANES studies correlate in-depth interviews about diet, exercise and lifestyle patterns, and cardiovascular history along with clinical health measurements (height and weight, blood pressure, cholesterol, urinary sodium excretion, blood iron, etc.) from thousands of ordinary Americans. Even early on, there appeared to be an independent higher risk and a greater need to lower sodium at 40 and older, all other health risk factors being equal.
But of course 40 seems too young to be middle-aged. And the USDA, which issues the Dietary Guidelines for Americans, tends to downplay certain elements of the risk statements so that no one, or at least not the agency’s chief constituents, gets upset. The no one in this case might easily be the Continue reading
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