Plant-based living, movement, stress, relationships—and the difficulty of knowing which factors matter most
Michael Dorfman is in his eighties, active, energetic, and still playing pickleball. He attributes much of his health to a whole-food, plant-based diet and the lifestyle that surrounds it. He has followed a plant-based diet for about 16 years and was vegetarian for decades before that.
That makes him interesting as an example.
It does not tell us why he is healthy. If someone reaches their eighties in unusually good health, it is tempting to identify the most obvious difference in their lifestyle and give it credit.
Michael points strongly to plant-based nutrition.
Perhaps he is right.
His life also includes regular physical activity, meditation, social interaction, a sense of purpose, continued learning, and a willingness to change habits he believes are harming him.
Which variable matters most?
First, What Does "Plant-Based" Mean?
Vegetarian, vegan, and plant-based are often treated as though they describe the same thing.
They do not.
A vegetarian may avoid meat while still eating dairy products. A vegan avoids animal products, although someone can technically eat a vegan diet containing highly processed foods, refined carbohydrates, sweets, and very little nutritional variety.
Michael's version is better described as whole-food plant-based nutrition. The emphasis is on minimally processed fruits, vegetables, beans, legumes, grains, and other plant foods rather than simply eliminating animal products.
If someone says, "I tried a vegan diet and it didn't work," we don't know what that person ate.
If someone says veganism made them healthy, the absence of meat may not have been the only meaningful change. Maybe they simultaneously stopped eating fast food, refined foods, excessive sugar, or highly processed meals.
The label alone doesn't tell us enough.
Michael's Experience Suggests Diet Matters
Michael had been a vegetarian since the 1970s, although he continued eating dairy products. He described getting colds, congestion, and sore throats regularly during that period. His brother, already eating plant-based, suggested dairy might be contributing.
Michael removed dairy and adopted the whole-food plant-based diet he follows today. He believes the change played a major role in his health.
That is meaningful evidence from one person's experience. It is not proof of causation.
The same problem appears whenever we say, “I changed X and Y happened.” Something happened. The harder question is, was X the reason? If Michael changed his diet. while also exercising, meditating, remaining socially active, living with purpose, and changing other habits, isolating the effect of food becomes difficult.
That doesn't make his experience irrelevant. It means we should resist extracting more certainty from it than it can provide.
Population Studies Have the Same Problem
The conversation turned to research comparing populations with different disease rates.
Michael discussed rural populations with comparatively low rates of chronic disease and tied some of those differences to plant-centered diets.
My immediate question was about the other variables. People living in rural areas may also experience different air pollution, physical activity, stress levels, social structures, environmental exposures, sleep patterns, and daily routines. If two populations have different rates of disease, diet may be one explanation.It may not be the only one.
During our conversation, I specifically asked how environmental factors could be separated from diet when comparing rural and urban populations. That question led naturally to the Blue Zones.
The Blue Zones Make the Diet Question More Interesting
The Blue Zones are places identified for unusually high longevity, including Okinawa, Sardinia, Icaria, Loma Linda, and Nicoya. Michael brought them up as support for plant-based eating.
There is support for that idea in the pattern he described. These communities traditionally ate diets heavily centered on plant foods, although they were not necessarily completely vegan. Some consumed fish or other animal foods.
The other similarities are just as interesting. People remained physically active. They continued working or participating in meaningful activities late into life. They had strong social connections, belonged to communities, and their environments encouraged movement. They experienced different patterns of stress than many people living in modern cities.
This changes the question. Rather than asking:
What food makes people live longer?
We might ask:
What does the entire lifestyle of long-lived people look like?
Maybe Movement Is More Important Than We Give It Credit For
Michael's life contains another clue: He keeps moving. He plays pickleball. He exercises. He uses a hanging bar. He has practiced meditation for decades. Even in his eighties, physical activity remains a normal part of his life.This resembles what is often observed in long-lived populations. Movement isn't always packaged as "exercise."
People walk, garden, work, cook, visit neighbors, climb stairs, carry things, and participate in ordinary physical life. That may be different from spending most of the day sitting and trying to compensate, with three hours at a gym each week.
Maybe the important variable isn't exercise.
Maybe it is remaining physically engaged with life.
Stress and Relationships May Matter Just as Much
One of the strongest themes to emerge from the Blue Zone discussion had little to do with food.
Social connection.
Michael described long-lived communities where people remain connected to family, friends, religious groups, or other supportive communities. That deserves more attention.
A person can eat perfectly and still spend every day isolated, sedentary, stressed, unhappy, and without meaningful purpose. Would we expect diet alone to overcome all of that?
Probably not.
Likewise, someone with a less-than-perfect diet who walks every day, sleeps well, maintains close relationships, has meaningful work, experiences relatively low stress, and feels connected to others may have important health advantages.
This is why reducing longevity to a food argument seems inadequate. Health appears to be a system.
What About Individual Differences?
This was one place where I pushed back against applying one dietary philosophy universally. I've experimented with a number of diets myself. A completely raw vegan diet caused me to lose more weight than I wanted. During another period eating vegan, my energy didn't feel right and I found myself wanting some animal food.
That doesn't prove my body requires meat. It does make me cautious about telling everyone that one diet will produce the same result.
We discussed the blood-type diet during the conversation. I explicitly treated it as a theory rather than an established explanation. Michael was skeptical of its significance and pointed out that his wife is type O and has done well on a vegan diet for many years.
Neither observation settles the question.
Mine doesn't prove blood type matters.
His wife's experience doesn't prove it doesn't.
What both examples illustrate is the difficulty of moving from: this worked for me, to, this will work for everyone. That leap requires much stronger evidence.
The Most Useful Dietary Advice Is Less Extreme
One of Michael's most practical statements came later in the conversation. Rather than insisting everyone stop eating meat, he said his broader recommendation is to eat more whole plant-based foods. Someone does not have to become vegan to ask:
Am I eating enough vegetables and fruit?
Enough beans, whole grains, and fiber?
Michael raised fiber as an example because nutritional discussions about plant-based diets often focus on protein.
People ask vegans:
Where do you get your protein?
Michael thinks another question deserves attention:
Where do you get your fiber?
That is useful regardless of whether someone eats meat. A person could disagree with Michael about complete veganism and still conclude that their diet would improve by replacing some highly processed food with beans, vegetables, fruit, oats, or whole grains. We don't have to accept an entire dietary philosophy to find something useful inside it.
The Hardest Part May Be Knowing What Information to Trust
Nutrition advice is contradictory.
One expert tells us to avoid fat. Another says fat is healthy. One recommends meat. Another believes animal protein contributes to chronic disease. One recommends fasting. Another emphasizes breakfast. One person thrives on a particular diet. Another reports feeling terrible on it.
Michael has become interested in the ways commercial incentives can shape health information, particularly within the food and pharmaceutical industries. Financial incentives deserve scrutiny.
Once we become convinced that mainstream sources are influenced by incentives, it becomes easy to assume that alternative sources are therefore correct.
Both deserve scrutiny.
Ask About Incentives—Including Your Own
A useful question is: Who benefits if I believe this?
A pharmaceutical company may profit from a drug.
A food company may profit from a processed product.
A supplement company profits from supplements.
An author may profit from a diet book.
An influencer may profit from convincing people that conventional experts cannot be trusted.
Everyone can have incentives.
We have our own.
If I love eating a particular food, I am more likely to accept evidence telling me it's healthy.
If I've followed a diet for twenty years, admitting that part of it may be wrong carries a psychological cost.
If my identity has become tied to being vegan, carnivore, keto, paleo, or anything else, contradictory evidence is no longer merely nutritional information.
It can feel personal.
Cognitive Dissonance Can Keep Us From Changing
Michael brought up cognitive dissonance. The idea is simple. Two beliefs conflict.
Smoking is enjoyable.
Smoking may cause serious disease.
One option is to stop smoking.
Another is to find reasons the health evidence is exaggerated.
We discussed how the same process can occur when someone's job depends on something they suspect may be harmful. Acknowledging the problem could threaten their income, identity, or relationships.
Health decisions are full of this. We don't evaluate evidence as detached machines. We evaluate it while having preferences, habits, fears, loyalties, identities, and financial interests.Recognizing that doesn't eliminate bias. It at least gives us a chance to notice it.
Personal Stories Are Useful—Within Limits
Michael shared the story of a close friend with severe heart disease who was given a poor prognosis. She changed her diet after Michael gave her a book advocating plant-based nutrition and ultimately lived for years beyond what her family had reportedly been told to expect.
I understand why that experience had such a powerful effect on him. If you watch someone change their lifestyle and dramatically outlive a prognosis, it is difficult not to connect the two. Perhaps they were connected. We still have to ask:
What medical treatments did she receive?
What else changed?
How accurate was the original prognosis?
Which part of the lifestyle change mattered?
Would another person experience the same result?
Anecdotes reveal possibilities worth investigating. The mistake is treating an anecdote as though it has already answered the question.
What Can We Reasonably Conclude?
I don't think this conversation proves that a completely vegan diet is the secret to longevity. I also don't think that conclusion is necessary to find value in Michael's experience.
His diet is predominantly whole plant foods. He remains physically active. He meditates. He maintains relationships. He has purpose. He stays intellectually engaged. He pays attention to his body. He questions information.
At more than 80 years old, he remains remarkably active.
The Blue Zone discussion points in a similar direction, not toward one food - toward a pattern. The mistake is looking for the single variable. The healthy populations we admire do not merely eat differently.
They live differently.
What You Can Do
You don't need to solve every nutritional argument before improving the way you live. Start with the things that appear useful across many different health philosophies.
Eat more whole foods, particularly vegetables, fruits, beans, legumes, and whole grains.
Reduce highly processed foods.
Keep moving throughout the day rather than relying entirely on scheduled exercise.
Maintain relationships and spend time with people who matter to you.
Find activities that give you purpose and reasons to remain engaged.
Pay attention to stress and develop ways to manage it.
Notice how your body responds when you change your diet or lifestyle.
Ask questions when health claims seem too simple and look for competing explanations. Consider who benefits from the advice you're receiving. Be especially willing to question claims you already want to believe. Don't confuse personal experience with universal proof.
Michael's experience gives us something valuable to examine. It doesn't give us a formula everyone has to follow.
Perhaps the best lesson isn't:
Eat what Michael eats.
It's:
Look at the entire system that appears to be working. The question isn't merely what helps us live longer. It's what helps us remain healthy enough to keep living while we're here.
Editor's Note: This article is based on my conversation with Michael Dorfman, author of The Thriving Vegan and Information Warfare: The Battle for Truth and Freedom, on The Daniel Stih Podcast. Michael's experiences and views provided the starting point for many of the questions explored here. The structure, analysis, conclusions, and commentary are my own.
This article is for educational purposes only and is not medical advice. Anyone considering significant dietary or medical changes should consult an appropriate healthcare professional.
Listen or Watch
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Want to Learn More About Michael's Plant-Based Approach?
Michael describes his approach in The Thriving Vegan. During our conversation, he also discussed The China Study by T. Colin Campbell as an important influence on his decision to move from vegetarianism to a whole-food plant-based diet.
The Thriving Vegan
On Amazon: https://www.amazon.com/THRIVING-VEGAN-Discover-Foods-Loves/dp/1095677667
Michael Dorfman's Website: http://www.michaeljdorfman.com
About the Author
Daniel Stih (danielstih.com) is an aerospace engineer, software engineer, indoor environmental consultant, and author of 12 books. For more than 30 years, he has investigated complex problems spanning engineering, technology, the built environment, and human decision-making. His work explores how evidence, assumptions, and systems shape the conclusions we draw—and whether we're solving the right problem. Learn more about his approach in Why I Think This Way.