Food Politics

by Marion Nestle
Sep 15 2023

Fruit-industry study of the day: IV. Avocados

I want to end the week with this unusual example.

Yes, avocados are fruits (hint: fruits have seeds).

This story begins with an emailed ad from an avocado trade association to subscribers to Today’s Dietitian.

In the largest study of its kind, published in the Journal of the American Heart Association, researchers across multiple institutions looked at the impact of consuming one avocado per day on weight-related measures, markers of cardiometabolic risk and diet quality—insights you won’t want to miss.

If you click around to further discussion, you get this:

Daily avocado consumption led to reductions in total and LDL cholesterol and improved diet quality compared to the control group. The Avocado Nutrition Center supported this study, and although the findings from one study cannot be generalized to larger populations, this study supports a growing body of evidence that suggests consuming heart-healthy avocados is associated with better diet quality.

Let’s take a look:

Comment: I don’t usually include the names of authors of industry-funded studies because I don’t see the “funding effect” (a higher probability of positive results) as personal to individual investigators; I see it as systematic.  But I listed these authors because they produced something quite rare: an industry-funded study that did not find positive results.  And they said so explicitly, without hedging or trying to spin the results so they looked  more favorable.

The avocado marketers did the spinning.  This, alas, is yet another hazard of  doing studies funded by food trade associations with vested interests in research outcome.  Investigators have no control over how the sponsor will use or spin their research results, as we see in this example.

Addition, September 16

I often hear criticisms that I don’t deal with the science when I post industry-funded studies.  I don’t because how the science is conducted is rarely the problem.  Instead, industry influence turns up most frequently in the study design or in the interpretation of the results.  That’s what’s happening here, as a reader, mrpicasso2, writes:

Wow! This is astounding how the Avocado marketers try to spin the results in their favor. “Changes in most secondary and additional outcome measures (cardiometabolic risk factors), except for modest decreases in total cholesterol and LDL‐C concentrations, were not statistically significant” became “Daily avocado consumption led to reductions in total and LDL cholesterol and improved diet quality compared to the control group.”

And even the “improved diet quality” is a big stretch because the Healthy Eating Index (HEI) values (even when split into below and above the median subgroups) were not significantly different. It’s true the avocado arm values were numerically higher (0.064 vs 0.044, and 0.083 vs 0.069) but without reaching statistical significance they are indistinguishable.

Of course the Avocado marketers don’t mention that there were 9 adverse events in the Avocado diet arm compared with none in the habitual diet group.

This reminds me of the story of the boy who was so excited to get a pile of horse manure for his birthday because he reasoned that with so much manure there had to be a pony near by.

Sep 13 2023

Fruit-industry funded study of the day: III. Mango leaf extract

The study:  Martinez-Canton M, Galvan-Alvarez V, Garcia-Gonzalez E, Gallego-Selles A, Gelabert-Rebato M, Garcia-Perez G, Santana A, Lopez-Rios L, Vega-Morales T, Martin-Rincon M, et al. A Mango Leaf Extract (Zynamite®) Combined with Quercetin Has Exercise-Mimetic Properties in Human Skeletal Muscle. Nutrients. 2023; 15(13):2848. https://doi.org/10.3390/nu15132848

Hypothesis:  Zynamite PX®, a mango leaf extract combined with quercetin, enhances exercise performance by unknown molecular mechanisms.

Conclusion: Zynamite PX® elicits muscle signaling changes in resting skeletal muscle resembling those described for exercise training and partly abrogates the stress kinases responses to exercise as observed in trained muscles.

Funding: This investigation was co-financed in part by Nektium Pharma S.L., Ministerio de Economía y Competitividad…Consejo Superior de Deportes de España (EXP_75097), FEDER and Cabildo de Gran Canaria…and FDCAN (Fondo de Desarrollo de Canarias).

Conflicts of Interest: The present investigation was partially financed by Nektium Pharma S.L, who provided the polyphenolic compounds and participated in the experimental design, although they were fully excluded from participation in experimental data collection, data analysis and interpretation of results. The remaining funding agencies had no role in study design, data collection, management, data analysis, interpretation of data, writing of the report, and the decision to submit the report for publication.

Comment: This is a classic example of an industry-funded supplement study with favorable interpreted favorably.  The manufacturer paid for the study as part of a private-public partnership to aid businesses in the Canary Islands.

 

Sep 12 2023

Fruit-industry study of the day. II. Figs.

For this one I thank Jerry Hagstrom, who writes The Hagstrom Report (Ag news as it happens) to which I subscribe.

This too begins with a press release: “REDISCOVER FIGS: THE ANCIENT FRUIT WITH MODERN APPEAL: Newly Published Literature Review Suggests the Intake of Figs Regularly in the Diet, Alone or with Other Dried Fruits, Increases Select Micronutrient Intake and is Associated with Higher Diet Quality.”

The study: Sandhu AK, Islam M, Edirisinghe I, Burton-Freeman B. Phytochemical Composition and Health Benefits of Figs (Fresh and Dried): A Review of Literature from 2000 to 2022. Nutrients. 2023 Jun 3;15(11):2623. doi: 10.3390/nu15112623.
Conclusion: Data suggest that the intake of figs regularly in the diet, alone or with other dried fruits, increases select micronutrient intake and is associated with higher diet quality, respectively. Research in animal and human models of health and disease risk provide preliminary health benefits data on figs and their extracts from fig parts; however, additional well-controlled human studies, particularly using fig fruit, will be required to uncover and verify the potential impact of dietary intake of figs on modern day health issues.
Funding: This research was funded by California Fig Advisory Board.
Comment: The title of this study triggered my usual question: “who paid for this?” In this case, the authors get high marks for cautious interpretation of their findings and explicit statement about what is and is not known.
Despite the promising preliminary research of figs and extracts from fig parts, additional well-controlled human studies, particularly using fig fruit, will be required to uncover and verify the potential impact of dietary intake of figs or nutraceutical applications on critical health issues such as managing cardiovascular disease, diabetes, and supporting gut health. Other areas such as satiety and cognitive function may also be worthy of exploration as evidence develops.
Sep 11 2023

Fruit industry-funded study of the day: I. Strawberries

I am way behind on posting all the industry-funded studies sent to me and collected, so will share a week’s worth of fruit studies .  This is to emphasize the obvious point that fruit is good for you, but one is not necessarily better than another–except to its marketers.  Enjoy!

Here’s the first: strawberries.

I heard about this from two news releases, and because it was sent to me by Charles Platkin, Executive Director, Center for Food as Medicine  and Distinguished Lecturer at Hunter College, City University of New York.

Wow.  This is exciting.  I had strawberries with my cereal for breakfast this morning.

I could not wait to read the study.

Uh oh.  Not yet published.  But given in a poster session at the American Society for Nutrition meetings in Boston last month.

  • Title: The Impact of Strawberries on Cognition and Cardiovascular Health of Older Healthy Adults: A Randomized, Crossover, Double-Blind, Placebo-Controlled Clinical Trial .
  • Objectives: The polyphenolic compounds in strawberries may improve cognitive function and cardiovascular health due to their antioxidant capacities. This study aimed to examine the effects of strawberries on cognitive function and cardiometabolic health in healthy aging adults.
  • Methods:  This was a randomized, crossover, double-blind, placebo-controlled clinical trial with 35 healthy older adults  given 26 grams of freeze-dried strawberry powder (not strawberries) and a control powder daily for 8 weeks each.
  • Results:  The strawberry powder group increased processing speed.  The control group increased episodic memory.  : The powder also had other effects: “Strawberry consumption reduced systolic blood pressure…Total antioxidant capacity significantly decreased during the control trial …and significantly increased with strawberry consumption.”
  • Conclusions: This study demonstrates that daily consumption of 26 grams of freeze-dried strawberry powder moderately improves cognitive processing speed, lowers systolic blood pressure, and increases total-antioxidant capacity, potentially promoting cognitive function and improving cardiovascular risk factors.
  • Funding Sources: This study was funded by California Strawberry Commission.

Comment: Of course it was.  Who else would care about the effects of strawberry powder.  Not that no other fruit powders were tested; I would expect all of them to produce similar effects, whatever those effects might be.  Given that the control group performed better on memory tests, you could interpret the results as not particularly meaningful.  But one characteristic of industry funded studies is to put a positive spin on whatever results occur.  We can argue about the methods when the study is actually published.  In the meantime, we have press releases.

Oh.  And my morning strawberries were somewhat local, red all the way through, and tasted like strawberries.  Do I feel smarter as a result?  Sure, why not.

Sep 8 2023

Weekend reading: The Politics of SNAP

Christopher Bosso.  Why SNAP Works: A Political History—and Defense—of the Food Stamp Program.  University of California Press,  2023. 

I did a blurb for this book:

Why SNAP Works is a lively, up-to-the-minute account of the history of thie program formerly known as Food Stamps, and contested from its onset.  Bosso’s compelling explanation of the reasons SNAP survived—and deserves to–in the face of so much opposition, makes his book a must read.

I thoroughly enjoyed reading it, not least because Bosso is such an entertaining writer.

The book makes a strong case for his take-home message::

Yes, the Supplemental Nutrition Assistance Program can be better.  But without it, millions of Americans would be worse off.  And if that sounds like faint praise, so be it.  The paradox of want among plenty has not disappeared.  Short of a system solution to poverty—the root cause of food insecurity—and in a land of so much food, often bordering on the obscene, SNAP at least ensures that all Americans get a better chance at a decent diet, a minimum element for a decent life, without sacrificing all personal autonomy and pride.

At a time when the Farm Bill is up for renewal and SNAP is under siege (again), the is book could not be more timely.

I hope everyone in Congress gets a copy and reads it.

Hey, I can dream.

Sep 7 2023

Insects as food: the latest update

The idea of adding or substituting insects for other protein foods is a big deal these days, if you count the amount of venture capital going into insect food startups.

Here are a few of the latest things I’ve seen on the topic.  Enjoy!

Sep 6 2023

On Netflix now: “Live to 100–Secrets of the Blue Zones”

I’ve just watched this four-part series on Netflix for two reasons, (1) the concept is fascinating and Dan Buettner does a great job with it., and (2) I’m in it in episodes #1 and #4.

Thanks to Martin Bruhn of Common Meadows Creamery for sending the screen shot.

I won’t go into all the details about the episodes, because Gothamist did a great job of reporting and analysis.

Buettner’s basic idea was to find out why a few relatively small and mostly isolated populations (“Blue Zones”) have so many members who live to the age of 100.

Spoiler alert: the secrets, no surprise, are diet (largely plant-based), physical activity built into daily life, community and social support, and a sense of purpose.

I am for all of these and that’s how I live, which explains my enthusiasm for these films.

Buettner works with cities to turn them into Blue Zones that support healthy diets, walking, and community support.

I got involved in this when Buettner invited me to join his team—and the Netflix crew—in South Phoenix where they were suggesting ways to Blue-Zone up the local environment.  I’m not a city planner but I could sure think of things that would make that part of Phoenix much more livable—parks, walking trails, shade trees (if they didn’t need too much water), stores selling fresh food, community gardens.

I like the concept a lot.  See the films and let me know what you think of them and those ideas.  Enjoy!

 

Tags:
Sep 5 2023

British Nutrition Foundation vs. concept of Ultra-Processed Food

I’m always surprised when the nutrition community opposes evidence for the association of ultra-processed foods with poor health outcomes.

I read an article about such opposition from the British Nutrition Foundation.

Bridget Benelam, a BNF spokesperson, explained: For many of us when we get home after a busy day, foods like baked beans, wholemeal toast, fish fingers or ready-made pasta sauces are an affordable way to get a balanced meal on the table quickly. These may be classed as ultra-processed but can still be part of a healthy diet.

I looked up the position statement of the British Nutrition Foundation.

At present, the British Nutrition Foundation believes that due to the lack of agreed definition, the need for better understanding of mechanisms involved and concern about its usefulness as a tool to identify healthier products, the concept of UPF does not warrant inclusion within policy (e.g. national dietary guidelines).

I also looked up its “Why trust us?” statement.

Our funding comes from: membership subscriptions; donations and project grants from food producers and manufacturers, retailers and food service companies; contracts with government departments; conferences, publications and training; overseas projects; funding from grant providing bodies, trusts and other charities.  Our corporate members and committee membership are listed on our website and in our annual reports.

With some diligent searching, I did indeed manage to find the list of corporate members.

Front group anyone?  Take a look.

Current members
AHDB (Agricultural and Horticulture Development Board) www.ahdb.org.uk

Aldi Stores Ltd https://www.aldi.co.uk/corporate-responsibility

Associated British Foods www.abf.co.uk

Arla www.arlafoods.co.uk

ASDA Stores Ltd www.asda.com

British Sugar plc www.britishsugar.co.uk

Cargill Inc www.cargill.com/

Coca Cola www.coca-cola.co.uk

Costa Coffee www.costa.co.uk

Danone Ltd www.danone.com/en

Ferrero www.ferrero.co.uk

General Mills www.generalmills.co.uk

Greggs plc www.greggs.co.uk

Innocent Drinks Ltd http://www.innocentdrinks.co.uk/

International Flavors & Fragrances Inc. www.iff.com

J Sainsbury Plc www.sainsburys.co.uk

Kellogg Europe Trading Ltd www.kelloggs.co.uk

Kerry Taste & Nutrition www.kerrygroup.com

KP Snacks Limited www.kpsnacks.com

Lidl GB www.lidl.co.uk

LoSalt www.losalt.com/uk

Marks and Spencer plc www.marksandspencer.com

Mars UK Ltd www.mars.com

McDonald’s Restaurants Ltd www.mcdonalds.co.uk

Mitchells & Butlers www.mbplc.com

Mondelez International www.mondelezinternational.com

National Farmers’ Union Trust Company Ltd www.nfuonline.com/home

Nestlé UK Ltd www.nestle.co.uk

Nestlé Nutrition www.smahcp.co.uk

Nomad Foods Europe www.iglo.com

PepsiCo UK Ltd  www.pepsico.co.uk

Pladis www.pladisglobal.com

Premier Foods www.premierfoods.co.uk

Quorn www.quorn.com

Slimming World www.slimmingworld.co.uk

Sodexo https://uk.sodexo.com

Starbucks www.starbucks.co.uk

Subway UK & Ireland https://www.subway.com/en-GB

Tata Global Beverages Ltd www.tataglobalbeverages.com

Tate & Lyle www.tate&lyle.com

Tesco Plc www.tesco.com

The Co-operative Group Ltd www.co-operative.coop

Uber Eats www.ubereats.com/gb

UK Flour Millers www.ukflourmillers.org

Waitrose & Partners www.waitrose.com

Weetabix www.weetabix.co.uk

Whitbread www.whitbread.co.uk

Wm Morrisons Supermarkets plc www.morrisons.co.uk

Yakult www.yakult.co.uk 

 

Sustaining Members

Agriculture and Horticulture Development Board www.ahdb.org.uk

ASDA Stores Ltd www.asda.com

Associated British Foods www.abf.co.uk

Coca-Cola Great Britain and Ireland www.coke.com

Danone UK Ltd www.danone.co.uk www.h4hinitiative.com

International Flavors & Fragrances Inc. www.iff.com

J Sainsbury plc www.sainsburys.co.uk

Kellogg Europe www.kelloggs.co.uk

Marks and Spencer plc www.marksandspencer.com

Mondelez International www.mondelezinternational.com

Nestlé UK Ltd www.nestle.com

PepsiCo UK Ltd www.pepsico.com www.walkers.co.uk www.quakeroats.co.uk www.tropicana.co.uk

Tate & Lyle www.tateandlyle.co.uk

Tesco www.tesco.com

Sustaining members agree to provide a donation to the British Nutrition Foundation for at least three years to support our wider charitable work focussing on consumer education, and engagement with the media, government, schools and health professionals. 

Help us improve