by Marion Nestle

Currently browsing posts about: Dairy

Sep 30 2019

Industry-funded studies of the week: Yogurt

These three papers were part of a supplement to Advances in Nutrition published in September 2019: Supplement—6th Yogurt in Nutrition Initiative (YINI) Summit / More than the Sum of Its Parts, sponsored by Danone Institutes International. Publication costs for this supplement were defrayed in part by the payment of page charges.

I.  Introduction to the Sixth Global Summit on the Health Effects of Yogurt: Yogurt, More than the Sum of Its Parts.  Sharon M Donovan ; Olivier Goulet. Advances in Nutrition, Volume 10, Issue 5, September 2019, Pages 913S–916S.

Conclusion: “Ultimately, the inclusion of fermented dairy products in food-based dietary guidelines, not only as a dairy option, but as a significant source of viable bacteria and fermentation products, could contribute to improved public health and should be considered.”

Author disclosures: “The guest editor of the supplement has the following conflict of interest: SMD co-chairs the Yogurt in Nutrition Initiative. She received reimbursement for travel expenses and an honorarium from Danone Institutes International for chairing the Sixth International Yogurt in Nutrition Summit at the Nutrition 2018 meeting in June 2018 in Boston, MA….SMD and OG are co-chairs of the Yogurt in Nutrition Initiative. Travel expenses and an honorarium were paid to SMD and OG by Danone Institutes International for chairing the Sixth International Yogurt in Nutrition Summit at the Nutrition 2018 meeting in June 2018 in Boston, MA. OG is also the Chair of Danone Institutes International.

II.  Dairy Foods, Obesity, and Metabolic Health: The Role of the Food Matrix Compared with Single Nutrients.  Dariush Mozaffarian.  Advances in Nutrition, Volume 10, Issue 5, September 2019, Pages 917S–923S,

Conclusion: “The present evidence suggests that whole-fat dairy foods do not cause weight gain, that overall dairy consumption increases lean body mass and reduces body fat, that yogurt consumption and probiotics reduce weight gain, that fermented dairy consumption including cheese is linked to lower CVD risk, and that yogurt, cheese, and even dairy fat may protect against type 2 diabetes. Based on the current science, dairy consumption is part of a healthy diet, without strong evidence to favor reduced-fat products; while intakes of probiotic-containing unsweetened and fermented dairy products such as yogurt and cheese appear especially beneficial.”

Disclosures: “DM received an honorarium from the American Society of Nutrition for the preparation of this manuscript. A freelance science writer, Denise Webb, was supported by Danone Institute International to prepare an initial draft of this manuscript for DM based on a recording of his talk and slides at the American Society of Nutrition 2018 Congress. The final manuscript was edited in detail and approved by DM. The funders had no role in the design, analysis, interpretation, review, or final approval of the manuscript for publication…DM reports research funding from the NIH and the Gates Foundation; personal fees from GOED, Nutrition Impact, Pollock Communications, Bunge, Indigo Agriculture, Amarin, Acasti Pharma, Cleveland Clinic Foundation, and America’s Test Kitchen; scientific advisory board, Elysium Health (with stock options), Omada Health, and DayTwo; and chapter royalties from UpToDate; all outside the submitted work.”

III.  Effects of Full-Fat and Fermented Dairy Products on Cardiometabolic Disease: Food Is More Than the Sum of Its Parts.  Arne Astrup; Nina Rica Wium Geiker; Faidon Magkos.  Advances in Nutrition, Volume 10, Issue 5, September 2019, Pages 917S–923S.

Conclusion: “Although more research is warranted to adjust for possible confounding factors and to better understand the mechanisms of action of dairy products on health outcomes, it becomes increasingly clear that the recommendation to restrict dietary saturated fat to reduce risk of cardiometabolic disease is getting outdated. Therefore, the suggestion to restrict or eliminate full-fat dairy from the diet may not be the optimal strategy for reducing cardiometabolic disease risk and should be re-evaluated in light of recent evidence.”

Disclosures.  “NRWG and FM, no conflicts of interest. AA is a member of advisory boards/consultant for BioCare Copenhagen, Denmark; Dutch Beer Institute, Netherlands; Gelesis, United States; Groupe Éthique et Santé, France; McCain Foods Limited, United States; Novo Nordisk, Denmark; Pfizer, United States; Saniona, Denmark; and Weight Watchers, United States. AA has received travel grants and honoraria as a speaker for a wide range of Danish and international consortia. AA is co-owner and member of the board of the consultancy company Dentacom Aps, Denmark; cofounder and co-owner of UCPH spin-outs Mobile Fitness A/S, Flaxslim ApS, and Personalized Weight Management Research Consortium ApS (Gluco-diet.dk). He is coinventor of a number of patents owned by the University of Copenhagen, in accordance with Danish law. He is coauthor of a number of diet and cookery books, including books on personalized diet approaches. AA is not an advocate or activist for specific diets and is not strongly committed to any specific diet.”

Comment

These papers aim to dispute the idea that full-fat dairy products but have negative health effects. This is a legitimate scientific question that deserves investigation and analysis, preferably by studies funded by independent sources.  Industry-funded studies and opinion pieces are well known to produce results and conclusions favorable to the sponsor’s interest, as is the case here.

 

Sep 5 2019

Industry-influenced study of the week: dairy and blood pressure

A reader, Gema Flores Monreal, who holds a doctorate in Food Science and Nutrition, pointed me to this study.  She noted that it examines the effects on blood pressure of eating 5 to 6 servings of dairy per day, twice what is typically recommended. 

it is easy to understand why a dairy company would want research like this.  People are consuming less dairy food, and the industry wants to reverse the decline.

The study:  Effect of high compared with low dairy intake on blood pressure in overweight middle-aged adults: results of a randomized crossover intervention studyRietsema S, and 11 other authors.  Am J Clin Nutr 2019;110:340–348.

Conclusions: “This intervention study shows that an HDD [high dairy diet] results in a reduction of both systolic and diastolic BP [blood pressure] in overweight middleaged men and women. If the results of our study are reproduced by other studies, advice for high dairy intake may be added to treatment and prevention of high BP.”

Funding: “Supported by the Public–Private Partnership Topconsortium voor Kennis en Innovatie (TKI) Agri & Food (TKI-AF-12104).”  FrieslandCampina, a Dutch multinational dairy cooperative, is part of the partnership.  Two of the authors are employed by FrieslandCampina.

Comment: As I discuss in Unsavory Truthresearch like this has a high probability of producing biased results.  I’m reserving judgment about dairy foods and blood pressure until results like these are confirmed by independent research.

Jun 10 2019

Industry-funded study of the week: dairy foods, type 2 diabetes, and cardiovascular disease

Knowing that this review was sponsored by the dairy industry, can you predict its conclusions?

Association between dairy intake and the risk of contracting type 2 diabetes and cardiovascular diseases: a systematic review and meta-analysis with subgroup analysis of men versus women. Moshe Mishali, Shiri Prizant-Passal, Tova Avrech, and Yehuda Shoenfeld . Nutrition Reviews 2019;77(6):417–429.

Conclusions: “In conclusion, these results, indicating that dairy product consumption decreases the risk of T2D and CVD, are in line with the recommendations for the public to consume dairy products. The findings about sex differences and the positive effect of milk on women need further establishment. Future studies should focus on isolating the effect of dairy products for men and women throughout their life span

Funding. This work was financed by the Israel Dairy Board.

Declaration of interests. M.M. is a consultant for the Israel Dairy Board. S.P. was paid for her work by the Israel Dairy Board. T.A. is Chief Health Officer at the Israel Dairy Board. Y.S. is a consultant for the Israel Dairy Board.

Comment: This is a study paid for by the Israeli dairy industry.  As such, it can well be considered an advertisement.  Like other such industry-funded studies (as I discuss in Unsavory Truth), it puts a positive spin on equivocal results (“need further establishment”).

May 27 2019

Industry-funded journal supplement: dairy and health

Nutrition journals sometimes publish supplements on specific topics.  These are paid for by sponsors.  The papers listed here are part of a supplement to the May 2019 issue of Advances in Nutrition.

The sponsor?  As stated in the introductory article,

This supplement was sponsored by the Interprofessional Dairy Organization (INLAC), Spain. The sponsor had no role in the design of the studies included in the supplement; in the collection, analyses, or interpretation of the data; in the writing of the manuscripts; or in the decision to publish the results. Publication costs for this supplement were defrayed in part by the payment of page charges. The opinions expressed in this publication are those of the authors and are not attributable to the sponsors or the publisher, Editor, or Editorial Board of Advances in Nutrition.

Author disclosures: The authors have no conflicts of interest to declare.

The authors may think they have no conflicted interests, but as I discuss in Unsavory Truth, the effects of industry funding often are unconscious, unintentional, and unrecognized.

As is typical of industry-sponsored studies, the results of these dairy-funded studies are predictable.  From looking at these titles, you can predict that they will show dairy foods to have positive effects on pregnancy, lactation, child growth, bone density, and cognition, and no negative effects on mortality, metabolism, type 2 diabetes, cardiovascular disease, or cancer.

The overall conclusion is also predictable:

In conclusion, the systematic reviews and meta-analyses of the present supplement support adequate milk consumption at various stages of life and in the prevention/control of various noncommunicable chronic diseases.

If the dairy industry wants the public to believe these results, it should not be paying for them. 

Supplement—Role of Milk and Dairy Products in Health and Prevention of Noncommunicable Chronic Diseases: A Series of Systematic Reviews

 

May 7 2019

The sad state of the US dairy industry: sensible policies needed

The New York Times writes about the tragedy of Wisconsin dairy farms.

Over the past two years, nearly 1,200 of the state’s dairy farms have stopped milking cows and so far this year, another 212 have disappeared, with many shifting production to beef or vegetables. The total number of herds in Wisconsin is now below 8,000 — about half as many as 15 years ago. In 2018, 49 Wisconsin farms filed for bankruptcy — the highest of any state in the country, according to the American Farm Bureau Federation.

It explains this as the result of “The rise of corporate farms and more efficient milking processes have led to an oversupply as consumption of milk has waned nationally.”

What’s going on with dairy farming is astonishingly poor policy, especially for small farmers who are now a deeply endangered species.

How to explain?  Bad policy.

In what other industry would you find producers continuing to ramp up production while demand slides, and then stuffing the growing pile of surplus into warehouses, hoping the federal government will buy some of it?

The result: The government is now stockpiling 1.4 billion pounds of cheese.

Should dairy farmers go back to a system of restricting production the way they do in Canada?

One thing is for sure.  If we want local dairy farms to survive, we have to find a way to pay dairy farmers as much or more than it costs them to produce.

Serious policy thinking, anyone?

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Apr 23 2019

What’s up with cheese in China?

I was in Beijing last week, reading the English-language, government-issued China Daily in my hotel, and ran across this article about China’s “growing appetite for cheese,”

Cheese has never been part of traditional Chinese cuisines, and the Chinese still do not eat much.

Currently, annual per capita consumption of cheese in China is only 0.1 kilogram, far below 2.4 kg in Japan, 2.8 kg in South Korea, 15 kg in the United States and 18.6 kg in Europe where France, Germany and the Netherlands take the top three spots, according to the China Dairy Industry Association.

But there is a big push to encourage dairy consumption.  Chinese dietary guidelines advise adults to consume 300 grams of dairy a day.

The annual per capita consumption of dairy products in China has reached 36 kg now, much higher than the 6 kg recorded two decades ago, but the volume is still less than half that of Asia and less than a third of the world average.

This all seems odd to me.  Asian populations tend to be lactose intolerant, making dairy products difficult to digest.  But dairy foods are believed to promote faster growth and taller heights in children, which the government deems desirable.  Many people can handle dairy foods, especially yogurt and other fermented varieties.

I went to a large supermarket in an area where many foreign embassies are located and was impressed by the size of the dairy aisle.

But on an Untour Food Tour to Beijing’s lower income alleys (hutongs), I was taken to a tiny store devoted exclusively to dairy products.

Most of the products were milk or yogurt.  The cheese in both places was mostly slices, Kraft and the like.

But in an indoor farmers’ market, I visited Le Fromager de Pekin stall and did some tasting.  At the moment, French cheese makers (or American, for that matter) have nothing to fear from Chinese competition.   I will be interested to see how cheesemaking progresses.

In the meantime, I’m not the only one fascinated by the very thought of cheese in China.  DairyReporter.com notes:

Three decades after most consumers had tried their first cheese slice or milk shake, fortunes have changed dramatically for dairy in China.The country is now the world’s biggest importer of dairy products, with a younger, more mobile generation ravenous for cheeses from overseas. With a market value of US$12bn today, cheese sales are expected to grow by US$4bn over the next year, according to Mintel. In just two years the number of Chinese cheese-eaters has grown from 15% to 17% in 2017, with the market researcher anticipating further rises of 13% annually until 2021.

As for dairy use, the unanticipated consequences are already emerging, not least the environmental impact of the transition from sheep to dairy cows in New Zealand.

A massive rise in the country’s dairy herd over the last 20 years has had a devastating impact on the country’s freshwater quality, a key area being targeted by the government for improvement….groundwater failed standards at 59% of wells owing to the presence of E coli, and at 13% of the wells owing to nitrates. Some 57% of monitored lakes registered poor water quality, and 76% of native freshwater fish are at risk of or threatened with extinction…the main culprits for worsening freshwater quality were the intensive use of fertilisers, irrigation and cows.

And much of this is driven by China’s purchases of New Zealand’s dairy production.

Kiwi companies sold $4b worth of dairy products in China. Milk powder, butter and cheese mainly. The success of dairy companies Fonterra and A2 is largely underpinned by exports to China. Fonterra [a New Zealand company] accounts for 36 per cent of all dairy imports into China…11 per cent of China’s total dairy consumption was produced by Fonterra, and 26 per cent of Fonterra’s output was shipped to China.

It’s hard to believe that any of this is good for the health of people or the envirornment.

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Apr 8 2019

Industry-funded study of the week: dairy and chronic disease

This is one of my ongoing updates of industry-funded studies such as those discussed in my most recent book, Unsavory Truth.

Here’s this week’s example:

Funding sources and outcomes of dairy consumption research – a meta-analysis of cohort studies: The case of type-2 diabetes and cardiovascular diseases.  Moshe Mishali, Mirit Kisner,Tova Avrech.  International Dairy Journal, accepted and in press 2019.

The study: The authors asked whether the source of funding was associated with the results of studies examining the association of dairy food intake with the risk of type 2 diabetes or heart disease.

Conclusion:  “This meta-analysis found that the funding source (i.e., food industry sponsorship versus neutral organisations sponsorship) did not affect the findings of studies in terms of the association between dairy consumption and the risk of developing type-2 diabetes and cardiovascular diseases…This meta-analysis suggests that research funded by the dairy industry might not deserve the same dismissive treatment that other industry-funded studies might merit.”

Funder: “This work was supported by the Israel Dairy Board Research – Fund (DBRF). Declaration of interest Moshe Mishali is a consultant for the Israel Dairy Board; Mirit Kisner was paid for her work by the Israel Dairy Board; Tova Avrech is Chief Health Officer at the Israel Dairy Board.”

Comment: This study was commissioned by the Israel Dairy Board specifically to address “The radicalised discourse that emerged in recent years [which] sees industry-funded research as inherently biased due to the obvious vested interests of any industry that initiates and funds certain studies…We sought to check if the suspicion is warranted when it comes to the dairy industry.”

These conclusions are consistent with those of Wilde et al (2012), although that study found that independently funded research included the only studies with results unfavorable to dairy (3 out of 16), whereas the industry-funded research came out 100% in favor of dairy products.

I would find the arguments about the benefits of dairy food more convincing if they were funded and conducted by investigators with no skin in the game.

Apr 1 2019

Industry-funded study of the week: chocolate milk for teenage athletes

After the debacle over Fifth Quarter Fresh that I wrote about in Unsavory Truth, you might think that sellers of chocolate milk would stop trying to prove it anything other than a sugary milk drink.  But no, here’s another one.

Chocolate Milk versus carbohydrate supplements in adolescent athletes: a field based study.  Katelyn A. Born, Erin E. Dooley, P. Andy Cheshire, Lauren E. McGill, Jonathon M. Cosgrove, John L. Ivy and John B. Bartholomew.  Journal of the International Society of Sports Nutrition (2019) 16:6.

Method: “Participants were randomly-assigned to receive either CM [chocolate milk] or CHO [carbohydrate] immediately post-exercise.”

Conclusion: “CM had a more positive effect on strength development and should be considered an appropriate post-exercise recovery supplement for adolescents.”

Funder: Dairy MAX [“nonprofit dairy council representing more than 900 dairy farm families across seven states”].

Comment: The premise of this study is that drinks containing a combination of carbohydrate and protein have been shown to provide better recovery from vigorous exercise than drinks containing carbohydrate or protein alone.  Chocolate milk contains both.  This study compared it to a carbohydrate-only sports drink, making this an excellent example of how to design a study to give you the desired result.