by Marion Nestle

Search results: "dietary guidelines"

May 29 2011

MyPyramid R.I.P.

On May 26, the USDA announced that it will be releasing a new “food icon” to replace the foodless and useless 2005 MyPyramid:

 

The USDA’s press announcement explained:

The 2010 White House Child Obesity Task Force called for simple, actionable advice to equip consumers with information to help them make healthy food choices. As a result, USDA will be introducing the new food icon to replace the MyPyramid image as the government’s primary food group symbol. It will be an easy-to-understand visual cue to help consumers adopt healthy eating habits consistent with the 2010 Dietary Guidelines for Americans.

What will the new icon look like?  The USDA isn’t saying, but William Neuman of the New York Times did some sleuthing.  According to his account:

The circular plate, which will be unveiled Thursday, is meant to give consumers a fast, easily grasped reminder of the basics of a healthy diet. It consists of four colored sections, for fruits, vegetables, grains and protein, according to several people who have been briefed on the change. Beside the plate is a smaller circle for dairy, suggesting a glass of low-fat milk or perhaps a yogurt cup.

And WebMD scored an interview with Robert C. Post, PhD, deputy director of the USDA Center for Nutrition Policy and Promotion, who gave additional hints:

“There will be a ‘how-to’ that will resonate with individuals. That is the behavioral part that is needed. We need to transcend information — ‘here’s what the science says’ — and give people the tools and the opportunities to take action.”

He referred to six how-to messages to guide healthy eating that were released with the 2010 Dietary Guidelines, and which I enthusiastically posted when the Guidelines were released (I was disappointed that they weren’t actually part of the Guidelines):

Balancing Calories

• Enjoy your food, but eat less.

• Avoid oversized portions.

Foods to Increase

• Make half your plate fruits and vegetables.

• Switch to fat-free or low-fat (1%) milk.

Foods to Reduce

• Compare sodium in foods like soup, bread, and frozen meals—and choose the foods with lower numbers.

• Drink water instead of sugary drinks.

A bit of history:

From 1958 until 1979, the USDA’s food guide was sort of a rectangle illustrating four food groups: Dairy, meat, fruits and vegetables, breads and cereals.  In 1979, USDA introduced a highly controversial design with food groups stacked on top of each other, with the plant-food groups at the top and the animal-food groups underneath (the producers of these foods did not like that).

Beginning in 1980, the USDA conducted an extensive research project to develop a new design—the pyramid—which it released in 1991 and withdrew immediately under pressure from meat producers.

In 1992, after a year of extraordinary controversy (recounted in my book Food Politics), the USDA released its highly controversial Food Guide Pyramid.

 

Why was it controversial?  The food industry objected that the Pyramid make it look as if you were supposed to eat more foods from the bottom of the pyramid than the top (which, of course, was its point).

Nutritionists objected that it encouraged eating too many servings of grains and, therefore, encouraged obesity.

In 2005, the USDA replaced it with the unobjectionable MyPyramid.  The food industry liked this one because it did not indicate hierarchies in food choices.  Most nutritionists that I know hardly knew what to do with it.  It required going online and playing with a website, and was unteachable in clinic settings.

I thought the 1992 pyramid had a lot going for it, particularly the idea that it’s better to eat some foods than others.  But MyPyramid was a travesty–hopelessly complicated, impossible to teach, and requiring the use of a computer.

Given this situation, the new image is highly likely to be an improvement.  If the new icon keeps the hierarchy, conveys concepts easily, and does not require online access, I will consider it a great step forward.

Fingers crossed.

Details about the release:

The announcement will be Thursday, June 2, 10:30 a.m. EDT. It will be live-streamed at www.usda.gov/live.   All information will be posted at www.cnpp.usda.gov.

I’ll be there.  Stay tuned.

 

 

Balancing Calories• Enjoy your food, but eat less.

• Avoid oversized portions.

Foods to Increase

• Make half your plate fruits and vegetables.

• Switch to fat-free or low-fat (1%) milk.

Foods to Reduce

• Compare sodium in foods like soup, bread, and frozen meals—and choose the foods with lower numbers.

• Drink water instead of sugary drinks.

Apr 15 2011

Why partnerships with food companies don’t work

Michael Siegel, MD, MPH, a Professor at the Boston University School of Public Health (whom I do not know), has been mailing me copies of his recent blog posts on partnerships between food corporations and health organizations, particularly the American Academy of Pediatrics (AAP), the American Academy of Family Physicians (AAFP) (see my previous posts), and the American Dietetic Association (ADA) (see my previous posts on this one too).

Dr. Siegel’s current post discusses two reasons why these partnerships do more for the food companies than they do for the organizations:

1. Coca-Cola and other Big Food companies are using these partnerships to enhance their corporate image, and therefore, their bottom line: sales of unhealthy products that are contributing towards the nation’s obesity epidemic.

In its 2010 annual report, Coca-Cola writes: “…researchers, health advocates and dietary guidelines are encouraging consumers to reduce consumption of sugar-sweetened beverages, including those sweetened with HFCS or other nutritive sweeteners. Increasing public concern about these issues…may reduce demand for our beverages, which could affect our profitability.”

…Pepsico, in its 2010 annual report, also makes clear the connection between the company’s public image and its bottom line: “Damage to our reputation or loss of consumer confidence in our products for any of these or other reasons could result in decreased demand for our products and could have a material adverse effect on our business, financial condition and results of operations, as well as require additional resources to rebuild our reputation.”

2. The American Dietetic Association, American Academy of Pediatrics, and American Academy of Family Physicians are supporting companies that oppose virtually every state-specific public health policy related to improvement of school nutrition, reduction of junk food and soda consumption, and environmental health and safety.

…Through its contributions to the Grocers Manufacturers Association (GMA), Coca-Cola is opposing any and all taxes on sugar-sweetened beverages (soft drinks), opposing the removal of BPA from bottles containing liquids consumed by infants, opposing legislation to simply require the disclosure of product ingredients, opposing taxes on candy, opposing bottle bills, opposing all restrictions on BPA-containing packaging, opposing standards for food processing, and opposing school nutrition standards.

…That the AAP, AAFP, and ADA have fallen for Coca-Cola’s tricks is one possibility. The other, which I find more likely, is that they have been bought off. In other words, that the receipt of large amounts of money has caused them to look the other way. It’s amazing what a little financial support will do. And of course, this is precisely the reason why companies like Coca-Cola and Pepsico include the sponsorship of public health organizations in their marketing plans.

I’m just back from the American Society of Nutrition meetings in Washington, DC, where the daily newsletter put out by the society included full-page advertisements from Coca-Cola, the beef industry, and the Corn Refiners Association (see yesterday’s post).  And then there is the astonishing example of Coca-Cola’s $10 million gift to Children’s Hospital of Philadelphia to head off a potential city soda tax.

It is completely understandable why food and beverage companies would want to buy silence from health professionals.  It is much less understandable why health organizations would risk their credibility to accept such funding.  Professor Siegel’s analyses of these issues are worth close attention.

Apr 3 2011

Food is cheaper because costs are “externalized”

My monthly Food Matters column for the San Francisco Chronicle:

Food is cheap at market, but costs a lot elsewhere

Q: I pay a lot for food, and more each day, but then people like you say our food is cheap because its real costs are “externalized.” Huh? What’s that supposed to mean?

A: Food prices are indeed going up, and I can hardly keep track of the possible causes: natural disasters, crop failures, commodity speculation, corn used for biofuels, lack of research in agriculture, the declining value of the U.S. dollar and just plain greed.

But we Americans still pay relatively less for food than anywhere else because so many of the costs of industrialized food production are “externalized.” We pay for them, but not at the grocery store.

Human costs

I was reminded of externalized food costs when reading about the remarkable efforts of a Salinas teacher to educate children of itinerant farmworkers. The kids are trying to learn under disrupted, impoverished, crowded living conditions. If their parents were paid and housed better, we would pay more for food.

Last summer I visited fish canneries at the far end of the Alaskan peninsula. The fish packers were women from the Philippines, working round the clock for months to send money home to their children and families.

The canneries used to hire Alaskan high school students at wages high enough to put them through college. But to keep prices competitive, the companies reduced wages and imported labor. That money disappeared from the community.

The CEO of a large U.S. meat company told me that if he raised wages by $3, he could hire locals and not have to deal with immigrant labor. But then he would have to raise the price of his meat by 3 cents per pound (I’m not kidding). That amount, he claimed, would price him out of competitiveness.

Environmental costs

Twenty billion dollars of our tax money goes to subsidies for industrial food production every year. Additional tax money is required to clean up the mess created by that system – polluted drinking water, infertile soil, ocean dead zones and overall misery in the surrounding areas.

While driving to give a talk at a college in rural Minnesota last year, I passed within a mile or so of an industrial pig farm. The overpowering smell – an externalized cost – was still on my clothes hours later.

Safety costs

Food safety is one casualty of a food system devoted to low cost. Companies save money by cutting corners on oversight and overlooking safety violations. The Centers for Disease Control and Prevention (CDC) says food pathogens cause 48 million illnesses, 128,000 hospitalizations and 3,000 deaths each year.

Some experts say unsafe food costs Americans $152 billion annually – $1,850 for each case in health care and lost wages. Severe illnesses from E. coli O157:H7 can generate more than $1 million in health care costs alone, and ruin lives forever.

To these amounts must be added the costs to food producers of product recalls, continued loss of sales, lawsuits and ruined reputations. Sales of spinach, for example, are only now returning to levels reported before the huge E. coli outbreak in 2006.

Here again, the cost of prevention is minimal for large companies producing large volumes of food. Officials of one vegetable-packing company told me that the impressively comprehensive food safety system they instituted in the wake of recalls raised the cost of their products by only one penny a case (I’m not kidding about this, either).

Despite ample evidence from surveys that consumers are willing to pay more to guarantee safe food, large food producers perceive those few pennies as competitive barriers.

Health care costs

Let’s count obesity as another externalized result of a cheap food system. The cheapest foods are high in calories and low in nutritional value – “junk” foods. When food is cheap, people eat more of it.

Abundant cheap food leads companies to aggressively market their products to be eaten any time, any place and in very large amounts – all of which promote biologically irresistible overeating.

Current estimates of the costs of obesity and its consequent illnesses in health care and lost productivity approach $147 billion annually, almost the same as the cost of unsafe food.

Accurate or not, such numbers provide ample evidence for the need to bring agricultural policy in line with health policy.

To pick just one example: Dietary guidelines say to eat more fruits and vegetables, and cut down on sodas. But the indexed cost of fruits and vegetables has increased by about 40 percent since the early 1980s, whereas that of sodas has decreased by about 20 percent.

The high externalized cost of our present food system is a good reason to reconsider current policies when the Farm Bill comes up for renewal in 2012. Now is the time to start working toward food system policies that will better promote health, safety and human welfare.

Marion Nestle is the author of “Food Politics,” “Safe Food,” “What to Eat” and “Pet Food Politics,” and is a professor in the nutrition, food studies and public health department at New York University. E-mail her at food@sfchronicle.com, and read her previous columns at www.sfgate.com/food.

This article appeared on page H – 4 of the San Francisco Chronicle

Feb 25 2011

UK health agency: limit red and processed meats to 3 ounces a day

The UK Department of Health issued a warning today to eat less red and processed meat.

  • Red meat means beef, lamb and pork as well as minced meat and offal from these animals.
  • Processed meat means ham, bacon, luncheon meat, corned beef, salami, pâté, sausages and burgers.

The warning is based on a new report from the independent Scientific Advisory Committee on Nutrition (SACN).  Its report evaluated the effects of iron on health. Because red meat is a primary source of dietary iron, the committee looked at evidence on the links between red meat and processed meats and bowel cancer.

The report concludes that the link “probably” exists and that:

Adults with relatively high intakes of red and processed meat (around 90 g/day or more) should consider reducing their intakes. A reduction to the UK population average for adult consumers (70 g/day cooked weight) would have little impact on the proportion of the adult population with low iron intakes.

How much is 90 grams?  It is only three ounces of cooked meat.

The UK Health Department advises:

  • People who eat a lot of red or processed meat – around 90g or more of cooked weight per day – are at greater risk of getting bowel cancer;
  • Cutting down to the UK average of 70g a day can help reduce the risk; and
  • This can be achieved by eating smaller portions or by eating red and processed meat less often.

The Department points out that cooked meat weighs about 70% of its uncooked weight (it has less water). So 3 ounces of cooked meat is equivalent to about 4 ounces of uncooked meat.

Expect to hear lots of reactions like “red meat can still be enjoyed in moderation as part of a healthy balanced diet.”

And where are the US Dietary Guidelines on the subject of red and processed meats?  Buried in euphemisms, alas:

  • Choose lean meats
  • Choose seafood instead of some meat
  • Reduce calories from solid fats

No wonder Americans are confused about diet and health.

Jan 5 2011

Pepsi’s answer to “eat natural”: snackify beverages and drinkify snacks

Over the holidays, Pepsi announced two changes to its products.

“All Natural” Frito-Lay: First, the company announced that half its Frito-Lay chips would now be made with “all natural” ingredients.

“Natural,” you may recall, has no regulatory meaning.  Companies pretty much get to define for themselves what the word means, provided what they say is “truthful and not misleading.”

By “natural,” Pepsi means removing MSG, artificial colors, and other chemical additives from some—but by no means all—chips and other snacks.  This is a good start, but Cheetos and Doritos?  Not a chance.

As to worries that the word “natural” is a calorie distractor and might encourage overeating, a Pepsi spokesperson said: “It’s meant to say: made with natural ingredients….It’s not meant to say: eat more.”  Really?  I’m not convinced.

Tropolis Squeezable Fruit: Next, Pepsi announced the latest innovation in kids’ products: Tropolis pouches of squeezable fruit.

I learned about Tropolis from a reporter at the Wall Street Journal, Valerie Bauerlein, who forwarded Pepsi’s press release:

Each fun-flavored 3.17 fl oz (90g) pouch provides a smooth blend of real squeezable fruit, is a good source of fiber, and offers 100 percent of the recommended daily value of vitamin C – all for less than 100 calories.

Tropicana Tropolis is made with no added sugars, artificial sweeteners or high fructose corn syrup; and no artificial flavors, colors or preservatives.

“Fun-flavored” is a euphemism for sugar.  The press release explains what’s not in the product.  So, what does it contain? It took some doing to find out, but it arrived eventually along with some further background information from Pepsi:

The issue is kids aren’t getting enough fruit, so Tropicana Tropolis is trying to help solve that problem in a fun, nutritious way…Studies show that families are not getting enough fruit and vegetables in their diets, and the health experts we talked to (registered dietitians and pediatricians) when developing Tropolis also raised this issue.

As you might imagine, I was not one of the experts they talked to.  Here are the ingredients:

  • Grape World: Apple puree, filtered water, banana puree concentrate, fibersol-2 fiber (maltodextrin), grape juice concentrate, apple juice concentrate, lemon juice concentrate, natural flavor and ascorbic acid (vitamin C).
  • Cherry World: Apple puree, filtered water, banana puree concentrate, fibersol-2 fiber (maltodextrin), apple juice concentrate, cherry juice concentrate, lemon juice concentrate, natural flavor and ascorbic acid (vitamin C).
  • Apple World: Apple puree, filtered water, banana puree concentrate, fibersol-2 fiber (maltodextrin), apple juice concentrate, lemon juice concentrate, natural flavor and ascorbic acid (vitamin C).

Translation: “Juice concentrates” is another euphemism for sugar.  You don’t believe me?  See the list of sugar euphemisms in the 2005 Dietary Guidelines (Table 14).

My translation: this is watery apple and banana sauce, artificially thickened, sweetened with fruit sugars, flavored with additives, and with added vitamin C.

As Valerie Bauerlein’s Wall Street Journal account explains,  this product is about expanding Pepsi’s profits in the “better-for-you” category as captured in a quotation that is sure to become a classic.

Ms. Nooyi [Pepsi’s CEO] has said she wants to build the nutrition business to $30 billion from $10 billion by 2020.…We see the emerging opportunity to ‘snackify’ beverages and ‘drinkify’ snacks as the next frontier in food and beverage convenience,” Ms. Nooyi said.

I ’m also quoted in her article (I did the interview while stranded in Miami trying to get back to snowbound New York):

Marion Nestle, a professor of nutrition at New York University, said that the fruit concentrates are simply sugar. “They start out with real food, so let’s give them credit for applesauce and mashed-up bananas,” but “the rest of it is sugar,” she said. “Kids would be better off eating an apple or a banana.”

PepsiCo said Tropolis should get kids to eat more fruit, which is what’s most important.

Tropolis raises my favorite food philosophy question: Is a “better-for-you” product necessarily a good choice?  Is this a good way to get kids to eat more fruit?

You decide.

Jan 1 2011

Predictions: national nutrition issues for 2011

My first San Francisco Chronicle “Food Matters” column for the new year deals with some predictions:

Q: Whatever you used as a crystal ball last year turned out to be a pretty good predictor of the most prominent food issues of 2010. How about trying again: What food matters will we be hearing about in 2011?

A: It doesn’t take a crystal ball to figure out what’s coming up with food issues. I’m happy to make predictions, especially since most seem fairly safe.

Dietary guidelines will be released this month. By law, they were due last year and are already late. What will they say? The 2010 guidelines advisory committee recommended eating more fruits, vegetables and whole grains, but introduced a new euphemism – SOFAs, or Solid Fats and Added Sugars – for the “eat less” advice. SOFAs really mean “cut down on fatty meat and dairy products” and “avoid sugary sodas.”

Will government agencies have the nerve to say so? Let’s hope.

The U.S. Department of Agriculture will issue a new food guide. The 2005 pyramid’s rainbow stripes proved impossible to teach and useless to anyone without a computer. I’ve heard a rumor that I will love the new design. I’m skeptical. I liked the original 1992 pyramid. It showed that bottom-of-the-pyramid foods were healthiest, making it unpopular with companies selling top-of-the-pyramid products. But it is healthier to eat some foods than others (see: dietary guidelines).

Will the USDA improve on the 1992 design? We will soon find out.

The fights over food safety will continue. At the last possible moment, Congress passed the food safety bill by a large majority. Now the fights really begin.

Funding will be most contentious, with the actual regulations not far behind. The Congressional Budget Office absurdly considered the bill’s provisions to be “budget neutral.” They are anything but.

The bill’s provisions require the Food and Drug Administration to hire more inspectors just at a time when Republican lawmakers have sworn to cut domestic spending. The FDA also must translate the bill’s requirements and exemptions for small farmers into regulations.

Rule-making is a lengthy process subject to public comment and, therefore, political maneuvering. Watch the lobbying efforts ratchet up as food producers, large and small, attempt to head off safety rules they think they won’t like.

Expect more lawsuits over the scientific basis of health claims. The Federal Trade Commission just settled a $21 million claim against Dannon for advertising that yogurt protects against the flu. The agency also has gone after scientifically unsubstantiated claims that omega-3s in kiddie supplements promote brain development and that pomegranate juice protects against prostate problems. POM Wonderful has already countersued the FTC on grounds that the First Amendment protects commercial speech. I’ll be watching this case carefully.

The FDA will issue new front-of-package label regulations. The FDA has promised to propose an at-a-glance symbol to indicate the overall nutritional value of food products. Food companies like the Guideline Daily Amount spots they are using in the upper corners of food packages because the symbols are factual but nonjudgmental. The FDA, however, is considering red, yellow and green traffic-light symbols that do convey judgments. Food companies say they will not voluntarily use a symbol that tells people to eat less of their products.

Will the FDA have the courage to make traffic lights mandatory? It will need courage. The new British government dealt with the traffic-light idea by summarily dismantling the food agency that suggested it.

Corporations will seek new ways to co-opt critics. Under the guise of corporate social responsibility, food companies have been making large donations to organizations that might otherwise criticize their products. The most recent example is the decision by Save the Children, formerly a staunch advocate of soda taxes, to drop that cause coincidentally at a time when its executives were negotiating funding from Coca-Cola.

Such strategies remind me of how the Philip Morris cigarette company distributed grants to leading arts groups. Expect food companies to use generosity to neutralize critics and buy silence.

School meals will make front-page news. Congress passed the Healthy, Hunger-Free Kids Act last month. Now the USDA must implement it by setting nutrition standards, adding fresh fruits and vegetables (some locally grown) and expanding eligibility.

President Obama has promised to restore the $4.5 billion “borrowed” from the SNAP (food stamp) program to fund this act. The scrambling over the regulations and financing should make excellent spectator sport.

Farm bill advocates will be mobilizing. You might think it too early to be worrying about the 2012 Farm Bill, but I’ve already gotten position papers analyzing commodity and food-assistance issues from groups gearing up to lobby Congress to bring agricultural policy in line with nutrition and public health policy.

I have a personal interest in such papers. I will be teaching a course on the Farm Bill at New York University next fall. Please get busy and write more of them!

Happy new year, and let’s see how my guesses play out.

Dec 31 2010

FoodPolitics catches up: USDA’s meat labeling

After a snow-induced stranding in Miami, the vacation ends, and FoodPolitics.com resumes by catching up on missed events.

Other missed events will follow, but let’s start with USDA’s announcement that it is requiring Nutrition Facts labels on meat and poultry products.

In the Final Rule published on its website, USDA says it will require labeling of fat and calorie content on all industrially packaged intact or ground, single-ingredient, raw meat and poultry by January 1, 2012.  USDA’s rule exempts small producers, however.

Nutrition Facts on meat and poultry have been a long time coming. USDA seriously considered such labels in 1990 when Congress passed the Nutrition Labeling and Education Act.  That act only required Nutrition Facts labels on FDA-regulated foods, which include pretty much everything except USDA-regulated meat and poultry.

By the time the USDA finally got around to proposing its own version in 2001, the agency made labeling voluntary.

You can guess what happened.  Meat and poultry producers happily volunteered not to label their products.

Why not?  Meat producers greatly prefer that you remain ignorant of the amount of fat and calories meat contains.

As is evident from this label example, meat labeling raises issues related to calories, fat, saturated fat, and serving size.

Calories: this particular ground meat contains 21 grams of protein and 11 grams of fat.  These provide 190 calories, per serving.

Fat: Fat is the major determinant of calories (9 per gram as compared to 4 per gram for protein). That is why more than 50% of the calories in this ground beef come from fat.

Saturated fat: The 4.5 grams of saturated fat in this meat account for 22% of the Daily Value, a lot or a little depending on what else you eat.

Serving size: The serving size is a quite reasonable 4 ounces (like a quarter-pounder).  It represents, however, a substantial increase over previous USDA serving size suggestions.  Since 1958, the USDA has considered a meat serving to include just 2-to-3 ounces.

As I discuss in Food Politics, pressures from meat producers over the years induced government agencies to steadily increase the amount of meat (or meat substitutes) recommended for daily intake.

  • 1958 to 1989 (USDA food guides): two daily servings of 2-3 ounces for a total of 4-to-6 ounces
  • 1990 (Dietary Guidelines): two daily servings of 2-3 ounces for a total of 6 ounces
  • 1992 (Food Guide Pyramid): two-to-three daily servings for a total of 5-to-7 ounces
  • 1995-2005 (Dietary Guidelines): two-to-three daily servings for a total of 4-to-9 ounces

If advice to consume two-to-three daily servings of meat (or meat substitutes) still holds, the recommendation will now be 8-to-12 ounces.

The 2010 edition of the Dietary Guidelines is overdue and should be released any day now.   In its report last June, the Dietary Guidelines Advisory Committee said:

Shift food intake patterns to a more plant-based diet that emphasizes vegetables, cooked dry beans and peas, fruits, whole grains, nuts, and seeds. In addition, increase the intake of seafood and fat-free and low-fat milk and milk products and consume only moderate amounts of lean meats, poultry, and eggs.

What will the new guidelines say about the amount of meat we should all be eating?  I can’t wait to find out.

Happy new year to all!

Addition, 1-1-11: I forgot to cite the USA Today story on this (I’m quoted).

Oct 22 2010

The latest salvos in the sodium debates

Scientific debates about the role of sodium in high blood pressure go on and on.  Committees of scientists reviewing the research invariably conclude that people would be healthier if they ate less salt (salt is sodium chloride).  The 2010 Dietary Guidelines Advisory Committee is only the most recent group to urge population-wide reductions in sodium intake.

The Institute of Medicine has just issued a new report on reducing sodium.  Its Report in Brief gives a quick summary

As its primary strategy for sodium reduction, the committee recommends that the FDA set mandatory national standards for the sodium content in foods…beginning the process of reducing excess sodium in processed foods and menu items to a safer level. It is important that the reduction in sodium content of foods be carried out gradually…Evidence shows that a decrease in sodium can be accomplished successfully without affecting consumer enjoyment of food products if it is done in a stepwise process that systematically and gradually lowers sodium levels across the food supply.

But wait!  Hypertension rates have been increasing for years without any change in sodium excretion, says a report in FoodNavigator.com.  The report refers to new study in this month’s American Journal of Clinical Nutrition reviewing trends in sodium excretion from 1957 to 2003.

Sodium excretion, a precise reflection of intake, say Adam Bernstein and Walter Willett of the Harvard School of Public Health, has not changed in the last half century, despite rising rates of high blood pressure.   Instead, they suggest that rising rates of obesity might be the cause.

The accompanying editorial, by David McCarron and his colleagues, takes the argument even further as can be seen just from its title: “Science trumps politics: urinary sodium data challenge US dietary sodium guideline.

The editorial says that this new study provides:

plausible, scientific evidence of a “normal” range of dietary sodium intake in humans that is consistent with our understanding of the established physiology of sodium regulation in humans. This scientific evidence, not political expediency, should be the foundation of future government policies….Guidance for sodium intake should target specific populations for whom a lower sodium intake is possibly beneficial. Such an approach would avoid broad proscriptive guidelines for the general population for whom the safety and efficacy are not yet defined.

Is this review likely to change the Dietary Guidelines due out later this year?  The Advisory Committee was convinced that the preponderance of evidence favors the importance of sodium as a causative agent in high blood pressure.

Because so much is at stake for the processed food industry, this argument is not likely to be resolved quickly.  Stay tuned.