Dietary Diversity, Processed Foods, and Individualized Nutrition with Dr. Christopher Gardner

This Huberman Lab episode features Dr. Christopher Gardner, a leading nutrition researcher, who challenges the notion of a single "best diet." He emphasizes human resilience, citing examples like the Tarahumara Indians (high-carb) and Alaskan Inuits (high-fat) thriving on vastly different indigenous diets. The core problem, according to Gardner and echoed by Michael Pollan, is the "Standard American Diet" (SAD), characterized by processed, packaged, convenient, inexpensive, and addictively tasty foods that lead to widespread health issues. The conversation highlights that while humans can adapt to diverse whole-food diets, the modern processed food landscape is universally detrimental.

The discussion delves into individual variability, acknowledging that people genuinely thrive on different dietary approaches (e.g., high-meat/fat vs. low-fat vegan), often counter to conventional advice. Gardner attributes this to a complex interplay of genetics and personal experience, though he notes that well-established genetic examples like lactose tolerance (prevalent in Northern Europeans due to lactase persistence) are rare. He stresses the importance of respecting individual experiences, even when objective clinical tests (like the hydrogen breath test for lactose intolerance) don't align with subjective symptoms, suggesting other underlying issues like SIBO.

The episode also critically examines processed foods beyond just macronutrient ratios or calories. Gardner expresses concern about food additives, dyes, emulsifiers, and glazing agents, though he notes the difficulty of studying their isolated effects on cardiometabolic markers in short-term human trials. He introduces the NOVA classification, developed by Carlos Montera, which categorizes foods by their degree of processing, independent of their nutritional content, highlighting the additive detrimental effects of ultra-processing. This framework suggests that the processing itself, not just the nutrient profile, contributes to negative health outcomes.

Finally, the conversation touches on the prevalence of wheat and gluten sensitivities in the US. Gardner posits that the issue might stem from the sheer volume of refined wheat consumed (90% of American grain intake) and the lack of genetic diversity in modern wheat strains due to monocropping, rather than a universal genetic predisposition to gluten intolerance. He suggests that the negative experiences many people report with wheat in the US might be mitigated by consuming heritage wheat varieties or a more diverse range of grains, underscoring the importance of food quality and variety over singular dietary restrictions.

So there isn't one best diet and I don't think we need different diets. We're just incredibly resilient and we can do crazy wild things.

Michael Pollen has a great quote on this, the author of Omnivore's Dilemma. And he says, you know, if you really look around the world, it is amazing how much variety there is in a diet that people can thrive on, except the one that doesn't work is the American diet, the standard American diet, because it's full of processed, packaged food.

So I am sure that there are different diets for different people. Um but at the end of the day it's just not the packaged processed food that the whole world is leaning towards.

So really the only classic example that's well established is lactose intolerance and lactase and northern Europeans developing the ability to continue making the enzyme lactase to break apart the molecule lactose well into adult life.

No other mammal on the planet drinks the breast milk of another mammal to thrive later in life. So, humans are the only ones who do it. It's really mostly cow milk. And it's kind of faking bizarre, but it works for a lot of people.

I think, um, the whole world is done listening to people tell them that their experience isn't real, right? And that's what a lot of I think that the um, confusion in the world of nutrition is about.

So my concern in the world of wheat and gluten intolerance is yeah, it's amazing how many people feel some distress and if they were tested, you might find out that they're not clinically gluten intolerant or I'm sure that's a continuum, but I think this actually has to do with our food supply.

And 10% is healthy carbs. And so I think what Americans are eating and I think the gluten intolerance has to do with wheat being such a predominant grain source when it doesn't need to be and very little variety in the wheat.

So this NOVA classification put together by Carlos Montera from Brazil is like the hot topic in the world of ultrarocessed food.

So the idea is you give it to a rat in a huge dose and you see if they get cancer and it makes metabolic sense that creates a plausibility that this is a carcinogen but it's really hard to test and think of you just said you couldn't keep track of how many red dyes there were or blue dyes or yellow dyes combined with emulsifiers and jelling agents and colorants and uh anti or glazing agents.