Flexitarian Diet Archives - Health Tips From The Professor

Eating For A Healthy Planet

April 26, 2022 by Dr. Steve Chaney

Can Diet Affect The Health Of Our Planet?

Author: Dr. Stephen Chaney

Earth Day has come and gone. You have recommitted to saving the planet. You plan to recycle, conserve energy, and turn in your gas guzzler for an energy efficient car. But what about your diet? Is your diet destroying the planet?

This is not a new question, but a recent commission of international scientists has conducted a comprehensive study into our diet and its effect on our health and our environment. Their report (W. Willet et al, The Lancet, 393, issue 10170, 447-492, 2019) serves as a dire warning of what will happen if we don’t change our ways. I touched on this report briefly in a previous issue of “Health Tips From The Professor”, but this topic is important enough that it deserves an issue all its own.

The commission carefully evaluated diet and food production methods and asked three questions:

Are they good for us?

Are they good for the planet?

Are they sustainable? Will they be able to meet the needs of the projected population of 10 billion people in 2050 without degrading our environment.

The commission described the typical American diet as a “lose-lose-lose diet”. It is bad for our health. It is bad for the planet. And it is not sustainable.

In its place they carefully designed their version of a primarily plant-based diet they called a “win-win-win diet”. It is good for our health. It is good for the planet. And it is sustainable.

In their publication they refer to their diet as the “universal healthy reference diet” (What else would you expect from a committee?). However, it has become popularly known as the “Planetary Diet”.

I have spoken before about the importance of a primarily plant-based diet for our health. In that context it is a personal choice. It is optional.

However, this report is a wake-up call. It puts a primarily plant-based diet in an entirely different context. It is essential for the survival of our planet. It is no longer optional.

If you care about our environment…If you care about saving our planet, there is no other choice.

How Was The Study Done?

The publication (W. Willet et al, The Lancet, 393, issue 10170, 447-492, 2019) was the report of the EAT-Lancet Commission on Healthy Diets from Sustainable Food Systems. This Commission convened 30 of the top experts from across the globe to prepare a science-based evaluation of the effect of diet on both health and sustainable food production through the year 2050. The Commission included world class experts on healthy diets, agricultural methods, climate change, and earth sciences. The Commission reviewed 356 published studies in preparing their report.

Can Diet Affect The Health Of Our Planet?

When they looked at the effect of food production on the environment, the Commission concluded:

“Strong evidence indicates that food production is among the largest drivers of global environmental change.” Specifically, the commission reported:

- Agriculture occupies 40% of global land (58% of that is for pasture use).

- Food production is responsible for 30% of global greenhouse gas emissions and 70% of freshwater use.

- Conversion of natural ecosystems to croplands and pastures is the largest factor causing species to be threatened with extinction. Specifically, 80% of extinction threats to mammals and bird species are due to agricultural practices.

- Overuse and misuse of nitrogen and phosphorous in fertilizers causes eutrophication. In case you are wondering, eutrophication is defined as the process by which a body of water becomes enriched in dissolved nutrients (such as phosphates from commercial fertilizer) that stimulate the growth of algae and other aquatic plant life, usually resulting in the depletion of dissolved oxygen. This creates dead zones in lakes and coastal regions where fish and other marine organisms cannot survive.

- About 60% of world fish stocks are fully fished and more than 30% are overfished. Because of this, catch by global marine fisheries has been declining since 1996.

“Reaching the Paris Agreement of limiting global warming…is not possible by only decarbonizing the global energy systems. Transformation to healthy diets from sustainable food systems is essential to achieving the Paris Agreement.”

The world’s population is expected to increase to 10 billion by 2050. The current system of food production is unsustainable.

When they looked at the effect of the foods we eat on the environment, the Commission concluded:

Beef and lamb are the biggest contributors to greenhouse gas emissions and land use.

- The concern about land use is obvious because of the large amount of pastureland required to raise cattle and sheep.

- The concern about greenhouse gas emissions is because cattle and sheep are ruminants. They not only breathe out CO₂, but they also release methane into the atmosphere from fermentation in their rumens of the food they eat. Methane is a potent greenhouse gas, and it persists in the atmosphere 25 times longer than CO₂.

The single most important thing we can do as individuals to reduce greenhouse gas emissions is to eat less beef and lamb. [Note: grass fed cattle produce more greenhouse gas emissions than cattle raised on corn because they require 3 years to bring to market rather than 2 years.]

- In contrast, plant crops reduce greenhouse gas emissions by removing CO₂ from the atmosphere.

In terms of energy use beef, lamb, pork, chicken, dairy, and eggs all require much more energy to produce than any of the plant foods.

In terms of eutrophication of our lakes and oceans, beef, lamb, and pork, all cause much more eutrophication than any plant food. Dairy and eggs cause more eutrophication than any plant food except fruits.

Eating For A Healthier Planet

In the words of the Commission: “[The Planetary Diet] largely consists of vegetables, fruits, whole grains, legumes, nuts, and unsaturated oils. It includes a low to moderate amount of seafood, poultry, and eggs. It includes no or a very low amount of red meat, processed meat, sugar, refined grains, and starchy vegetables.”

When described in that fashion it sounds very much like other healthy diets such as semi-vegetarian, Mediterranean, DASH, and Flexitarian. However, what truly distinguishes it from the other diets is the restrictions placed on the non-plant portion of the diet to make it both environmentally friendly and sustainable. Here is a more detailed description of the diet:

It starts with a vegetarian diet. Vegetables, fruits, beans, nuts, soy foods, and whole grains are the foundation of the diet.

It allows the option of adding one serving of dairy a day (It turns out that cows produce much less greenhouse emissions per serving of dairy than per serving of beef. That’s because cows take several years to mature before they can be converted to meat, and they are emitting greenhouse gases the entire time).

It allows the option of adding one 3 oz serving of fish or poultry or one egg per day.

It allows the option of swapping seafood, poultry, or egg for a 3 oz serving of red meat no more than once a week. If you want a 12 oz steak, that would be no more than once a month.

This is obviously very different from the way most Americans currently eat. According to the Commission:

“This would require greater than 50% reduction in consumption of unhealthy foods, such as red meat and sugar, and greater than 100% increase in the consumption of healthy foods, such as nuts, fruits, vegetables, and legumes”.

“In addition to the benefits for the environment, “dietary changes from current diets to healthy diets are likely to substantially benefit human health, averting about 10.8-11.6 million deaths per year globally.”

What Else Did The Commission Recommend?

In addition to changes in our diets, the Commission also recommended several changes in the way food is produced. Here are a few of them.

Reduce greenhouse gas emissions from the fuel used to transport food to market.

Reduce food losses and waste by at least 50%.

Make radical improvements in the efficiency of fertilizer and water use. In terms of fertilizer, the change would be two-fold:

- In developed countries, reduce fertilizer use and put in place systems to capture runoff and recycle the phosphorous.

- In third world countries, make fertilizer more available so that crop yields can be increased, something the Commission refer to as eliminating the “yield gap” between third world and developed countries.

Stop the expansion of new agricultural land use into natural ecosystems and put in place policies aimed at restoring and re-foresting degraded land.

Manage the world’s oceans effectively to ensure that fish stocks are used responsibly and global aquaculture (fish farm) production is expanded sustainability.

What we can do: While most of these are government level policies, we can contribute to the first three by reducing personal food waste and purchasing organic produce locally whenever possible.

What Does This Mean For You?

If you are a vegan, you are probably asking why the Commission did not recommend a completely plant-based diet. The answer is that a vegan diet is perfect for the health of our planet. However, the Commission wanted to make a diet that was as consumer friendly as possible and still meet their goals of a healthy, environmentally friendly, and sustainable diet.

If you are eating a typical American diet or one of the fad diets that encourage meat consumption, you are probably wondering how you can ever make such drastic changes to your diet. The answer is “one step at a time”. If you have read the Forward to my books “Slaying The Food Myths” or “Slaying the Supplement Myths”, you know that my wife and I did not change our diet overnight. Our diet evolved to something very close to the Planetary Diet over a period of years.

The Commission also purposely designed the Planetary Diet so that you “never have to say never” to your favorite foods. Three ounces of red meat a week does not sound like much, but it allows you a juicy steak once a month.

Sometimes you just need to develop a new mindset. As I shared in my books, my father prided himself on grilling the perfect steak. I love steaks, but I decided to set a few parameters. I don’t waste my red meat calories on anything besides filet mignon at a fine restaurant. It must be a special occasion, and someone else must be buying. That limits it to 2-3 times a year. I still get to enjoy good steak, and I stay well within the parameters of the Planetary diet.

Develop your strategy for enjoying some of your favorite foods within the parameters of the Planetary Diet and have fun with it.

The Bottom Line

Is your diet destroying the planet? This is not a new question, but a recent commission of international scientists has conducted a comprehensive study into our diet and its effect on our health and our environment. Their report serves as a dire warning of what will happen to us and our planet if we don’t change our ways.

The Commission carefully evaluated diet and food production methods and asked three questions:

Are they good for us?

Are they good for the planet?

Are they sustainable? Will they be able to meet the needs of the projected population of 10 billion people in 2050 without degrading our environment.

The Commission described the typical American diet as a “lose-lose-lose diet”. It is bad for our health. It is bad for the planet. And it is not sustainable.

In its place they carefully designed their version of a primarily plant-based diet they called a “win-win-win diet”. It is good for our health. It is good for the planet. And, it is sustainable.

The Planetary Diet is similar to other healthy diets such as semi-vegetarian, Mediterranean, DASH, and Flexitarian. However, what truly distinguishes it from the other diets is the restrictions placed on the non-plant portion of the diet to make it both environmentally friendly and sustainable (for details, read the article above).

I have spoken before about the importance of a primarily plant-based diet for our health. In that context it is a personal choice. It is optional.

However, this report is a wake-up call. It puts a primarily plant-based diet in an entirely different context. It is essential for the survival of our planet. It is no longer optional.

If you care about global warming…If you care about saving our planet, there is no other choice.

For more details read the article above.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure or prevent any disease.

Which Diets Are Best In 2022?

February 8, 2022 by Dr. Steve Chaney

Which Diet Should You Choose?

Author: Dr. Stephen Chaney

Many of you started 2022 with goals of losing weight and/or improving your health. In many cases, that involved choosing a new diet. That was only a month ago, but it probably feels like an eternity.

For many of you the “bloom” has gone off the new diet you started so enthusiastically in January.

Perhaps the diet isn’t working as well as advertised…

Perhaps the diet is too restrictive. You are finding it hard to stick with…

Perhaps you are always hungry or constantly fighting food cravings…

Perhaps you are starting to wonder whether there is a better diet than the one you chose in January…

Perhaps you are wondering whether the diet you chose is the wrong one for you…

If you are rethinking your diet, you might want to know which diets the experts recommend. Unfortunately, that’s not as easy as it sounds. The diet world has become just as divided as the political world.

Fortunately, you have an impartial resource. Each year US News & World Report invites a panel of experts with different points of view to evaluate popular diets. They then combine the input from all the experts into rankings of the diets in various categories.

If you are still searching for your ideal diet, I will summarize the US News & World Report’s “Best Diets In 2022”. For the full report, click on this link.

How Was This Report Created?

US News & World Report recruited panel of 27 nationally recognized experts in diet, nutrition, obesity, food psychology, diabetes, and heart disease to review the 40 most popular diets. The panel is not the same each year. Some experts are rotated off the panel, and others are added. The experts rate each diet in seven categories:

How easy it is to follow.

Its ability to produce short-term weight loss.

Its ability to produce long-term weight loss.

its nutritional completeness.

Its safety.

Its potential for preventing and managing diabetes.

Its potential for preventing and managing heart disease.

They converted the experts’ ratings to scores 5 (highest) to 1 (lowest). They then used these scores to construct nine sets of Best Diets rankings:

Best Diets Overall combines panelists’ ratings in all seven categories. However, all categories were not equally weighted. Short-term and long-term weight loss were combined, with long-term ratings getting twice the weight. Why? A diet’s true test is whether it can be sustained for years. And safety was double counted because no diet should be dangerous.

Best Commercial Diets uses the same approach to rank 15 structured diet programs that require a participation fee or promote the use of branded food or nutritional products.

Best Weight-Loss Diets was generated by combining short-term and long-term weight-loss ratings, weighting both equally. Some dieters want to drop pounds fast, while others, looking years ahead, are aiming for slow and steady. Equal weighting accepts both goals as worthy.

Best Diabetes Diets is based on averaged diabetes ratings.

Best Heart-Healthy Diets uses averaged heart-health ratings.

Best Diets for Healthy Eating combines nutritional completeness and safety ratings, giving twice the weight to safety. A healthy diet should provide sufficient calories and not fall seriously short on important nutrients or entire food groups.

Easiest Diets to Follow represents panelists’ averaged judgments about each diet’s taste appeal, ease of initial adjustment, ability to keep dieters from feeling hungry and imposition of special requirements.

Best Plant-Based Diets uses the same approach as Best Diets Overall to rank 12 plans that emphasize minimally processed foods from plants.

Best Fast Weight-Loss Diets is based on short-term weight-loss ratings.

Which Diets Are Best In 2022?

Are you ready? If this were an awards program I would be saying “Envelop please” and would open the envelop slowly to build suspense.

However, I am not going to do that. Here are the top 5 and bottom 5 diets in each category (If you would like to see where your favorite diet ranked, click on this link). [Note: I excluded commercial diets from this review.]

Best Diets Overall

The Top 5:

#1: Mediterranean Diet. The Mediterranean diet has been ranked #1 for 5 consecutive years.

#2: DASH Diet (This diet was designed to keep blood pressure under control, but you can also think of it as an Americanized version of the Mediterranean diet.)

#3: Flexitarian Diet (A flexible semi-vegetarian diet).

#4: MIND Diet (This diet is a combination of Mediterranean and DASH but is specifically designed to reduce cognitive decline as we age.)

#5: The TLC Diet (This diet was designed by the NIH to promote heart health.)

The Bottom 5:

#36: Whole 30 Diet (A whole food, restrictive diet, designed for a 30-day jump start to weight loss. It was not designed for long-term use).

#37: Modified Keto Diet (A slightly less restrictive version of the Keto Diet).

#38: Keto Diet (A high protein, high fat, very low carb diet designed to achieve ketosis).

#39: Dukan Diet (High protein, low carb, low fat diet).

#40: GAPS Diet (A diet designed to improve gut health).

Best Weight-Loss Diets

The Top 5:

#1: Flexitarian Diet

#2: Volumetrics Diet (A diet based on the caloric density of foods).

#3: Vegan Diet (A diet that only allows plant foods).

#4: Mayo Clinic Diet (A diet designed to establish lifelong healthy eating habits).

#5: Ornish Diet (A whole food, semi-vegetarian diet designed to promote heart health).

The Bottom 5:

#36: Fertility Diet (A diet designed to improve fertility, but the experts were skeptical that it would increase your chances of becoming pregnant)

#37: Whole 30 Diet

#38: Alkaline Diet (A diet designed to make your blood more alkaline, but the experts were skeptical about that claim)

#39: AIP Diet (A diet designed for people with autoimmune diseases)

#40: GAPS Diet

Best Diabetes Diets

The Top 5:

#1: Mediterranean Diet

#2: Flexitarian Diet

#3: Vegan Diet

#4: Mayo Clinic Diet

#5: DASH Diet

The Bottom 5:

#36: Alkaline Diet

#37: Dukan Diet

#38: GAPS Diet

#39: Sirtfood Diet (a very low calorie, fad diet that emphasizes plant foods rich in sirtuins)

#40: Whole 30 Diet

Best Heart-Healthy Diets

The Top 5:

#1: Mediterranean Diet

#2: Ornish Diet

#3: DASH Diet

#4: Flexitarian Diet

#5: TLC Diet

#6: Vegan Diet

The Bottom 5:

#36: Keto Diet

#37: AIP Diet

#38: Whole 30 Diet

#39: Modified Keto Diet

#40: Dukan Diet

Best Diets for Healthy Eating

The Top 5:

#1: Mediterranean Diet

#2: DASH Diet

#3: Flexitarian Diet

#4: MIND Diet

#5: TLC Diet

The Bottom 5:

#36: Raw Food Diet

#37: Atkins Diet

#38: Dukan Diet

#39: Modified Keto Diet

#40: Keto Diet

Easiest Diets to Follow

The Top 5:

#1: Mediterranean Diet

#2: Flexitarian Diet

#3: Fertility Diet

#4: MIND Diet

#5: DASH Diet

The Bottom 5:

#36: Modified Keto Diet

#37: Keto Diet

#38: Whole 30 Diet

#39: GAPS Diet

#40: Raw Foods Diet

Best Fast Weight-Loss Diets

The Top 5 (Excluding Commercial Diets):

#1: Atkins Diet

#2: Biggest Loser Diet

#3: Keto Diet

#4: Raw Food Diet

#5: Vegan Diet

The Bottom 5

#36: Dr. Weil’s Anti-Inflammatory Diet

#37: The Fertility Diet

#38: AIP Diet

#39: Alkaline Diet

#40: Gaps Diet

Which Diets Are Best For Rapid Weight Loss?

There are 3 take-home lessons from the rapid weight loss category:

1) If you are looking for rapid weight loss, any whole food restrictive diet will do. The top 5 diets are very different. For example, the keto and vegan diets are polar opposites, yet they both are in the top 5 for rapid weight loss.

The Atkins and keto diets are meat heavy, low carb diets. They restrict fruits, some vegetables, grains, and most legumes.

The Biggest Loser diet relies on restrictive meal plan and exercise programs.

The restrictions of the raw food diet are obvious.

The vegan diet is a very low-fat diet that eliminates meat, dairy, eggs, and animal fats.

I did not include commercial diets that rated high on this list, but they are all restrictive in one way or another.

2) We should ask what happens when we get tired of restrictive diets and add back some of your favorite foods.

If you lose weight on a vegan diet and add back some of your favorite foods, you might end up with a semi-vegetarian diet. This is a healthy diet that can help you maintain your weight loss.

If you lose weight on the Atkins or keto diets and add back some of your favorite foods, you end up with the typical American diet – one that is high in both fat and carbs. This is not a recipe for long-term success.

3) Don’t pay too much attention to the bottom 5 diets. None of them were designed with weight loss in mind.

Which Diet Should You Choose?

With rapid weight loss out of the way, let’s get back to the question, “Which Diet Should You Choose?” My recommendations are:

1) Choose a diet that fits your needs. That is one of the things I like best about the US News & World Report ratings. The diets are categorized. If your main concern is diabetes, choose one of the top diets in that category. If your main concern is heart health… You get the point.

2) Choose diets that are healthy and associated with long term weight loss. If that is your goal, you will notice that primarily plant-based diets top these lists. Meat-based, low carb diets like Atkins and keto are near the bottom of the lists.

3) Choose diets that are easy to follow. The less-restrictive primarily plant-based diets top this list – diets like Mediterranean, DASH, MIND, and flexitarian.

4) Choose diets that fit your lifestyle and dietary preferences. For example, if you don’t like fish and olive oil, you will probably do much better with the DASH or flexitarian diet than with the Mediterranean diet.

5) In case you were wondering, intermittent fasting ranked 26-30 and the Paleo diet ranked 26-33 on most of the list – not the worst diets, but a long way from the best. If you have a favorite diet I didn’t mention, check the US News website to find where it is ranked.

6) Finally, focus on what you have to gain, rather than on foods you have to give up.

On the minus side, none of the diets include sodas, junk foods, and highly processed foods. These foods should go on your “No-No” list. Sweets should be occasional treats and only as part of a healthy meal. Meat, especially red meat, should become a garnish rather than a main course.

On the plus side, primarily plant-based diets offer a cornucopia of delicious plant foods you probably didn’t even know existed. Plus, for any of the top-rated plant-based diets, there are websites and books full of mouth-watering recipes. Be adventurous.

The Bottom Line

For many of you the “bloom” has gone off the new diet you started so enthusiastically in January. If you are rethinking your diet, you might want to know which diets the experts recommend. Unfortunately, that’s not as easy as it sounds. The diet world has become just as divided as the political world.

There are probably two questions at the top of your list.

#1: Which diets are best for rapid weight loss? Here are some general principles:

If you are looking for rapid weight loss, any whole food restrictive diet will do.

We should ask what happens when we get tired of restrictive diets and add back some of our favorite foods.

Long term weight loss is possible if you transition to a healthy diet after you have lost the weight.

#2: Which diet should you choose? Here the principles are:

Choose a diet that fits your needs.

Choose diets that are healthy and associated with long term weight loss.

Choose diets that are easy to follow.

Choose diets that fit your lifestyle and dietary preferences.

Finally, focus on what you have to gain, rather than on foods you have to give up.

For more details on the diet that is best for you, read the article above.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.

What is the Flexitarian Diet?

March 26, 2019 by Dr. Steve Chaney

Is The Flexitarian Diet Good For You And Good For The Planet?

Author: Dr. Stephen Chaney

If you follow U.S News & World Reports, you may have noticed that the Flexitarian Diet was ranked #3, just slightly behind the Mediterranean and DASH diets. You may be scratching your head and wondering: “What is the Flexitarian Diet?” There are so many popular diets these days that it is hard to keep track. It is confusing. To paraphrase the old baseball quote: “You can’t tell the diets without a scorecard.”

Let me provide you with that scorecard. I will describe the Flexitarian Diet and answer two important questions:

Is the Flexitarian Diet good for you?
Is the Flexitarian Diet good for the planet?

What Is The Flexitarian Diet?

The term “flexitarian” was coined 10 years ago by dietitian Dawn Jackson Blatner in her book, “The Flexitarian Diet: The Mostly Vegetarian Way To Lose Weight, Be Healthier, Prevent Disease and Add Years To Your Life.” Flexitarian is simply a contraction of the phrase “flexible vegetarian.”

Blatner’s premise was two-fold:

A vegan diet is very healthy. It is also very restrictive and hard for most people to follow.
Allowing small amounts of meat and other animal products in a primarily vegetarian diet would preserve most of the health benefits of a vegan diet. It would also be more flexible and easier to follow.

The Flexitarian Diet has no strict rules or calorie limits. It has no prohibited foods or food groups. It is neither low-carb nor low-fat. It focuses more on what to eat than on what not to eat. It is just based on a few general principles:

Eat mostly fruits, vegetables, legumes, and whole grains. In other words, it is a primarily plant-based diet.
Focus on protein from plants rather than from animals.
Be flexible and incorporate small amounts of meat and animal products in your diet. Flexibility reigns here. The diet recognizes that some people do better with more meat and animal products than others.
Eat the least processed, most natural form of foods.
Limit added sugars and sweets.

If you have read my book, “Slaying The Food Myths,” you know that this is essentially a semi-vegetarian diet. It is also very similar to the Mediterranean and DASH diets.

Is the Flexitarian Diet Good For You?

As you may have guessed from the title of her book, Dawn Jackson Blatner claimed her diet would help you lose weight, get healthier, reduce your risk of diseases, and add years to your life. You might ask: “Is there any basis for her claims?”

The answer is “Yes,” but the evidence does not come from studies of the Flexitarian Diet. The evidence is based on similarities between the Flexitarian Diet and the semi-vegetarian diet, the Mediterranean diet, and the DASH diet.

I have covered the health benefits of these diets in detail in my book, “Slaying The Food Myths.” In summary, compared to people following the typical American diet or meat-based low-carb diets, people following these 3 diets:

Tend to weigh less.
Have a lower risk of diabetes and heart disease.
Have a lower risk of some forms of cancer.
Have lower blood pressure.
Have less inflammation.

In addition, a paper has recently been published entitled, “Flexitarian Diets and Health: A review of the Evidence-Based Literature” (EJ Derbyshire, Frontiers In Nutrition, 3: 1-7, 2017). The title is a bit misleading in that the review did not include any studies on Flexitarian Diets (There have been none). Instead, the study reviewed 25 studies of semi-vegetarian diets published between 2000 and 2016 and relied on the fact that the Flexitarian Diet and semi-vegetarian diets are virtually identical.

The study concluded that semi-vegetarian (Flexitarian) diets:

Resulted in weight loss.
Improved metabolic markers (cholesterol, triglycerides, blood sugar levels).
Lowered blood pressure.
Reduced the risk of type-2 diabetes.
May play a role in the management of Inflammatory bowel disease, such as Crohn’s disease.

In short, there is no direct evidence that the Flexitarian Diet is healthy. However, its similarity to semi-vegetarian, Mediterranean, and DASH diets makes it highly likely that the Flexitarian Diet is very good for you.

Is The Flexitarian Diet Good For The Planet?

The short answer is “Yes.” More importantly, it is critical for the health of our planet that we adopt a more plant-based diet. Our current diet is not environmentally sustainable.

That assessment is based on four factors; Greenhouse Gas Emissions, Land Use, Water Use, and Population Growth. Here are some fast facts to ponder:

Food production currently is responsible for:
- 40% of global land, and land conversion for food products is the single most important driver of biodiversity loss.
- Up to 30% of global greenhouse emissions.
- 70% of freshwater use.

The population is expected to increase by 2.5 billion people between now and 2050. That raises two important issues:
- How are we going to feed those people?
- How are we going to do it in a sustainable manner?
Ruminant animals (cattle and sheep, for example) are the worst offenders when it comes to greenhouse gas emissions. That’s because they not only breathe out CO2, but they also release methane into the atmosphere from fermentation of the food they eat in their rumens. Methane is a potent greenhouse gas, and it persists in the atmosphere 25 times longer than CO2. The single most important thing we can do as individuals to reduce greenhouse gas emissions is to eat less beef and lamb.

Two major studies have published recently that have evaluated the effect of food production on our planet.

The first study (L Aleksandrowicz et al, PLOS One, 11(11): e0165797, 2016) reviewed 63 studies that looked at the effect of dietary patterns on greenhouse gas emissions, land use, and water use. It concluded that moving from our current diet to a more plant-based diet would:

Reduce greenhouse gas emissions and land use for food production by 70-80%.
Reduce water use for food production by 50%.

The degree to which all these parameters could be reduced was generally proportional to the extent to which animal foods were replaced with plant foods (vegan > semi-vegetarian > Mediterranean).

The second study (W. Willet et al, The Lancet, 393, issue 10170, 447-492, 2019) was the report of the EAT-Lancet Commission on Healthy Diets from Sustainable Food Systems. This Commission convened 30 of the top experts from across the globe to prepare a science-based evaluation of the effect of diet on both health and sustainable food production through the year 2050. The Commission reviewed 356 published studies in preparing their report.

Based on an exhaustive evaluation of the literature on healthy diets and sustainable food production, the Commission recommended something they called the “Planetary Health Diet.” This science-based diet ended up being very close to the Flexitarian (semi-vegetarian) diet.

It starts with a vegetarian diet. Vegetables, fruits, beans, nuts, soy foods, and whole grains are the foundation of the diet.
It allows the option of adding one serving of dairy a day (It turns out that cows produce much less greenhouse emissions per serving of dairy than per serving of beef. That’s because cows take several years to mature before they can be converted to meat, and they are emitting greenhouse gases the entire time).
It allows the option of adding one 3 oz serving of fish or poultry or one egg per day.
It allows the option of swapping seafood, poultry, or egg for a 3 oz serving of red meat no more than once a week. If you want a 12 oz steak, that would be no more than once a month.

In other words, it is a less flexible version of the Flexitarian diet. You could also consider it a restrictive version of the Mediterranean or DASH diets.

The Commission concluded:

“A diet that includes more plant-based foods and fewer animal source foods is healthy, sustainable, and good for both people and planet.”
“Shifting from unhealthy diets to the ‘planetary health diet’ can prevent 11 million premature adult deaths per year and drive the transition toward a sustainable global food system by 2050 that ensures healthy food for all within planetary boundaries.”

The Bottom Line

The Flexitarian Diet has been in the news lately. You might be asking 3 questions:

What is the Flexitarian Diet?
Is it good for me?
Is it good for the planet?

Here are the answers:

#1: The Flexitarian Diet is a contraction of the phrase “flexible vegetarian.” It is a vegetarian diet that allows small amounts of meat, dairy, and/or eggs. It is virtually identical to what has been called a semi-vegetarian diet for years and is very similar to the Mediterranean and DASH diets.

#2: There is no direct evidence that the Flexitarian diet is healthy. However, its close similarity to the semi-vegetarian, Mediterranean, and DASH diets makes it highly probable that the Flexitarian Diet is a healthy diet. It is likely to be good for you.

#3: When greenhouse gas emissions, land & water use, and population growth are all taken into account, experts have concluded that the only sustainable diet is a semi-vegetarian diet in which meat, dairy, and eggs are severely restricted (details in the article above). You can think of it as a less flexible version of the Flexitarian diet or a very restrictive form of the Mediterranean or DASH diets.

According to these experts, controlling carbon emissions from fossil fuels is not enough. We also must change what we eat if we wish to avoid catastrophic global warming.

For more details read the article above.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure or prevent any disease.