Currently browsing posts about: Diets

In this strange era of social distancing, I am catching up on items of interest, this one on USDA’s Selected Charts from Ag and Food Statistics, published in February this year.

These cover the ag and food sectors, the rural economy, land and natural resources, farm income, production, food spending and prices,  food consumption, trade, and food security.

I love charts.  These are especially informative (and date from when USDA’s Economic Research Service was still functional).

Examples:

This is one reason why China is so important to our food economy.

And here’s why the current Coronavirus crisis will be so tough on the restaurant industry:

At a glance, we can see what dietary recommendations ought to be saying, although the grouping together of meat, eggs, and nuts is not particularly helpful in understanding what’s going on here.

The other charts—there are lots of them—are worth a look and have much to teach.  They make me even sadder about the loss of two-thirds of ERS staff when USDA moved the agency to Kansas City.

I am indebted to FoodNavigator-Asia.com for this intriguing bit of food news: “Health is wealth: Younger Chinese consumers make up 60% of bird’s nest purchases on JD.com.”

According to data collected by JD….consumption of bird’s nest was growing fast among this group of highly educated younger generation. The data also found that the average annual growth rate of bird’s nest sales on JD.com grew at more than 50% over the past five years…. “the younger generation in China, especially those born after 1990s are paying more attention to health as they are busy and might not eat well or rest enough.”

While edible bird’s nest is a nourishing food long prized in Chinese culture for promoting good health and skin benefits, it used to be exclusively reserved for the Chinese royal family due to its rarity and high price. However…it was now much “easier and convenient for everyday consumers to buy high-quality bird’s nest at a good price online.”

Edible bird’s nests are widely available for purchase in the U.S., imported, and not cheap.

See, for example:

  Venture capitalists: I see an opportunity here.

My Twitter feed over the Labor Day weekend was full of messages like this one:

It took me a while to figure out what they were talking about, but eventually I was sent a link to a story in Vice about people who became ill on vegan diets. The article quotes me:

“Most healthy people should be able to adapt to an all-plant diet,” says Marion Nestle, nutritionist, professor, and James Beard Award-winning author. She emphasizes eating a “variety of plant food sources, taking in enough calories to maintain a healthy weight, and finding a good source of vitamin B12.”

The article describes the health problems reported by some followers of vegan diets.  It quotes me again:

Nestle notes these problems are more associated with “starvation” than a standard plant-based diet, which “should not cause people to lose weight or have any of those issues.” However, Nestle adds that a diet high in fibrous plants can take time to adapt to, and people who have been advised to eat a low-fiber diet “will have problems eating a wide enough variety of plant foods to meet nutrient needs.” In other words, many of these influencers may be masking disordered eating habits that are unsustainable.

So, in answer to the tweets:

• I am an omnivore.
• I do not endorse vegan or any other kind of diet.
• I believe that many widely different dietary patterns can support good health.
• It is possible, but not always easy, to eat healthfully on a vegan diet.

Healthy diets generally contain a wide variety of relatively unprocessed foods in adequate but not excessive amounts.

There are lots of good ways of doing this.  Enjoy!

This is one of an ongoing series of examples of how industry funding skews, or to be more precise, is strongly associated with skewing, of research and opinion about matters of diet and health.

This example is an analysis of the scientific rigor of dietary approaches to controlling type 2 diabetes through diet.  The authors looked at the evidence for efficacy of the DASH, Mediterranean, Plant-Based, and Low-Carb diets.

Improving the Scientific Rigor of Nutritional Recommendations for Adults with Diabetes: A Comprehensive Review of the American Diabetes Association Guidelines Recommended Eating Patterns.  Hallberg S, Dockter NE, Kushner J, Athinarayanan S.  Preprints 2019.  Online March 5.  doi: 10.20944/preprints201812.0187.v2

Conclusion: “Our review of the current Standards and Recommendations finds significant shortcomings regarding scientific review methodologies, which are likely to translate to suboptimal clinical care decisions for patients with T2D.”  The study dismisses most studies of the DASH, Mediterranean, and Plant-based diets as poorly done or otherwise inappropriate for their review.  For the DASH diet, it says more research is needed.  It calls for more research on whether the benefits of Mediterranean diets are due to low carb or healthy fats, and suggests that the benefits of plant-based diets may be due to weight loss.  The best evidence supports the Low-Carb diet: “Evidence from 30 trials and 10 follow-up studies demonstrates that a low-carbohydrate diet is an effective dietary approach for addressing dyslipidemia.”

Conflict of Interest Statement:  SJH is an employee and shareholder of Virta Health, a for-profit company that provides remote diabetes care using a low-carbohydrate nutrition intervention, and serves as an advisor for Atkins Corp.  NED is a paid consultant for Virta Health.  JAK serves as medical director of McNair Interests, a private equity group with investments in type 1 diabetes and other chronic illnesses, and is also an advisor for Sanofi and Lexicon.

Comment:    All authors are employed by or consult for a company that uses low-carb dietary approaches in its for-profit business.  As I explain in Unsavory Truth, the influence of industry funding is often unconscious, unintentional, and unrecognized.  Nevertheless, the opinions of the authors can be predicted from their financial connections to Virta Health.

Nico Slate.  Gandhi’s Search for the Perfect Diet: Eating with the World in Mind.  University of Washington Press, 2019.  

Let’s start with my blurb:

Nico Slate’s fascinating account reveals Gandhi as an evidence-based, self-experimenting nutrition guru who tried one diet after another—vegan, raw, calorie restriction–in his quest for physical and spiritual health.  Above all, Slate explains Gandhi’s use of fasting as a political means to inspire India to achieve independence.

Gandhi, it seems, was a food faddist well ahead of his time.  The author says:

As his commitment to vegetarianism deepened, Gandhi grappled with whether he should also forgo eggs and milk.  Ultimately, he became convinced that he should become vegan, and renounced all animal products.  Living without eggs was relatively easy.  Doing without milk, by contrast, proved to be one of the greatest challenges of his life.  He experimented with almond milk, peanut milk, and other vegan alternatives.  In 1914, he vowed to abstain from all dairy products.  But after contracting a serious illness, he decided that his pledge did not include goat’s milk. [p. 47]

The book explains how Gandhi’s dietary choices were tightly linked to his politics.

The social potential of a raw diet led Gandhi to explore the cheapest source of sustenance for the poor: wild food…The greatest ethical challenge stemmed from the limitations of wild food as a remedy for poverty.  If the goal was to end hunger, changes in diet would be insufficient if they were not linked to changes in land ownership and the distribution of wealth—change that seemed as impossible as eating ginger nonviolently. [ p. 97]

And one more:

In a world marred by inequality, charity could only do so much.  Ultimately, Gandhi did not want to help the poor; he wanted to end poverty.  Over time, he developed a deeper understanding of the link between famine and imperialism.  “India suffers from starvation because there is dearth not of grain,” he explained, “but of purchasing power.”  The absence of purchasing power was, in turn, a direct result of the economic structures of British rule…Recognizing famine as a result of empire inspired Gandhi to demand India’s freedom. [p.127]

I’ve long argued that the most intellectually challenging issue in the field of nutrition is finding out what people eat.

Here’s what it takes:  Using DNA technology, investigators examined the stomach contents of the “Iceman,” a man who died 5300 years ago but was frozen in the Alps until his body was discovered some years ago.

The result: “a remarkably high proportion of fat in his diet, supplemented with fresh or dried wild meat, cereals, and traces of toxic bracken.”

A recent radiological re-examination of the Iceman, a 5,300-year-old European natural ice mummy, identified his completely filled stomach (Figure 1A) [2]…Previous isotopic analysis (¹⁵N/¹⁴N) of the Iceman’s hair suggested first a vegetarian lifestyle [12, 13] which was later, after careful re-examination of the data, changed to a omnivorous diet [14]. Further analyses of lower intestinal tract samples of the Iceman confirmed that he was omnivorous, with a diet consisting of both wild animal and plant material. Among the plant remains, there were cereals, pollen grains of hop-hornbeam, and fragments of bracken and mosses [14, 15, 16, 17, 18, 19, 20]… In summary, the Iceman’s last meal was a well-balanced mix of carbohydrates, proteins, and lipids, perfectly adjusted to the energetic requirements of his high-altitude trekking.

Nearly half (46%) of the bulk stomach contents consisted of animal fat, much of it saturated.  This, apparently, had consequences:

computed tomography scans of the Iceman showed major calcifications in arteria and the aorta indicating an already advanced atherosclerotic disease state [33].

Fascinating, no?  Now if we could do this kind of analysis on a population basis, think of the questions we could finally answer!

I’ve saved this for Weekend Reading because it will take a weekend to get through it.  The report is a blockbuster: 37 authors, 47 pages, 357 references.

The Lancet commissioned this report from the EAT Forum, which brought together international experts on diet and health (most of whom I do not know) to define unifying dietary principles that best promote will promote the health of people and the planet.

Fortunately, the diet that is best for health is the same diet as is best for the planet.  The report defines it on page 5.

To summarize:

This report has many strengths:

• It is researched in depth and is now the reference source for information about needed dietary changes.
• It firmly links dietary health to environmental sustainability.
• Its findings are consistent with many previous reports on diet and health, including that of the 2015 Dietary Guidelines Advisory Committee DGAC).
• Its messages are unambiguous.
• The summary report is a big help
• The timing  is excellent; the 2020 Dietary Guidelines advisory committee, if it ever gets appointed, will have to pay close attention to the science reviewed in this report.
• It focuses on food, not nutrients (these meals meet the standards of recommended diets).

Does this report settle the questions?  Hardly.  Remember the fuss over sustainability (the “S-word?”) in the 2015 report of the DGAC?

• The meat industry does not like advice to eat less meat.
• The dairy industry doesn’t like it either.  Its trade associations emphasize its nutritional value and source of livelihood for a billion people.
• The food industry has lots of complaints.

There is lots to read and think about here.  Enjoy!

• The Lancet home page for the report (includes slides, links)
• The Lancet editorial accompanying the report
• The EAT Forum home page for the report (information about EAT, the launch, the commission members, etc)
• The EAT Forum summary report

Lisa R. Young.  Finally Full, Finally Slim: 30 Days to Permanent Weight Loss One Portion at a Time.  Center Street, 2019.

I don’t usually write about diet books, but Lisa Young did her doctorate with me and I have followed her subsequent career with great interest.  She has taught for years in my NYU department and has a lively private practice counseling clients about weight loss and other nutrition issues.

Her book explains what works best with her clients.  She must be fun to work with.  The writing is warm, friendly, and to the point.  Her advice is easy and sensible: eat what you like (especially of healthy foods), just not too much.   She is generous with tips about how to deal with parties, restaurants, and other challenging situations, what she categorizes as “slices of advice,” “bite-size goodies,” and “wedges of wisdom.”

Her main focus is on portion control:

Portion control is like a classic wardrobe: It never goes out of style.  It’s not a trendy fad but a proven method for healthful living.  When you enjoy balanced meals and nutritious foods in appropriate portion sizes, you can get off the weight-loss merry-go-found.  So go ahead and enjoy a glass of wine or an occasional ice cream cone (a single scoop!).  Eat brown rice, quinoa, and other healthy carbs.  It’s not only okay.  It’s the best way to achieve long-term weight loss and maintenance.

Good advice, and easy to take.

No wonder its getting such great press.

• She’s on the cover of the January 2 New York Post, with much more about the book on pages 25, 26, and 27.
• Here’s an interview Lisa did in September.
• And here’s one she just did with Diet Detective.