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What if your brain fog, low mood, and poor focus were not just “in your head,” but connected to what is happening in your immune system, gut microbiome, and daily food choices? In this episode of The Dr. Brighten Show, Dr. Jolene Brighten sits down with Dr. Austin Perlmutter to unpack the connection between brain inflammation and food, including why the brain is literally built from the nutrients you eat, how added sugar may influence systemic inflammation, and why the gut-brain connection is one of the most important conversations in brain health right now.
Dr. Austin Perlmutter is a board-certified internal medicine physician, New York Times bestselling author, and Managing Director of Big Bold Health. His work focuses on brain and body health, including the biological roots of mental and physical “stuckness,” how environmental factors shape cognitive and emotional well-being, and how plant nutrients may impact human aging through epigenetics. His work has reached millions through media outlets including PBS, Rolling Stone, and NPR.
In this episode, Dr. Perlmutter and Dr. Brighten explore how brain inflammation, nutrition, the microbiome, stress, sleep, exercise, air quality, social media, and daily habits all intersect. But the heart of this conversation is simple and powerful: your brain is not separate from your body. It is built from the food you eat, shaped by the microbes you feed, and influenced by the inflammatory signals your body produces every day.
You’ll hear why omega-3 fats like DHA and EPA matter for brain and immune regulation, why added sugars and sugar-sweetened beverages are a key place to start if you want to support better metabolic and brain health, how vitamins and minerals like B vitamins influence cognition, and why polyphenols from colorful plants, spices, coffee, and other plant foods may be more than just “antioxidants.” Dr. Perlmutter also explains how the gut microbiome communicates with the brain through the vagus nerve and immune system, and why dysbiosis and LPS may matter when discussing brain inflammation.
This conversation is for anyone dealing with brain fog, mood changes, low energy, poor focus, gut issues, or concerns about long-term cognitive health. It is also for anyone who wants to better understand how food can influence the brain in a realistic, science-informed, and accessible way.
Brain Inflammation and Food: What You’ll Learn in This Episode
This episode connects the dots between nutrition, inflammation, the gut-brain axis, and cognitive health in a way that is practical without being oversimplified. Here’s what you’ll learn when you listen:
- Why Dr. Perlmutter says “your brain is made out of the food that you eat” and why that one sentence changes how we should think about nutrition.
- How omega-3 fats like DHA and EPA are involved in brain structure, immune regulation, and the activity of microglial cells.
- Why the conversation about carbohydrates needs nuance, including the difference between glucose your brain uses for energy and added sugar in your food.
- Why Dr. Perlmutter calls sugar-sweetened beverages one of the biggest concerns when talking about added sugar, inflammation, and brain health.
- The reason fruit is not the same as added sugar, and why fiber and the food matrix matter when it comes to your body’s response.
- How B vitamin deficiencies, including B1 and B12, can be connected to worsened cognition.
- Why amino acids from protein matter for neurotransmitter synthesis and why protein is part of the brain health conversation.
- What polyphenols actually are, why they are found in colorful plants and spices, and why they may be important for immune and brain health.
- Why coffee shows up in the conversation as a meaningful source of polyphenols, including the important note that decaf coffee still contains polyphenols.
- How spices like rosemary, oregano, and cloves may be concentrated sources of polyphenols.
- Why Dr. Brighten brings up traditional food combinations like turmeric with pepper, dairy, and fat as an example of how cultures have long used food synergy.
- What saffron may have to do with mental health, and why both doctors emphasize nuance instead of treating any one food or plant as a magic bullet.
- Why mushrooms, including lion’s mane, come up in the discussion of neuroactive and bioactive compounds in food.
- How the gut microbiome communicates with the brain through the vagus nerve, immune signaling, and the bloodstream.
- Why Dr. Perlmutter says every time you eat, you are eating for your microbes too—and why that may matter for brain inflammation.
- What dysbiosis means, and why an imbalance in gut flora may influence inflammatory signaling.
- Why LPS, or lipopolysaccharide, is discussed as a powerful trigger for microglial activation and inflammation when it gets into the bloodstream.
- The compelling statistic that about two-thirds of people affected by Alzheimer’s disease are women, and why hormones, the immune system, stress, and brain energetics may all matter in women’s brain health.
- Why Dr. Perlmutter says mild cognitive impairment does not always mean there is no way back, noting that some people with MCI may return to normal cognition.
- How daily choices can act like votes for either a healthier or less healthy brain.
- Why the “next best thing” may be more powerful than chasing perfection, especially when it comes to cutting back on sugar-sweetened beverages.
- How to build a better breakfast around protein, healthy fat, and fiber instead of relying on sweet breakfast foods that may leave your brain and metabolism struggling.
- Why caffeine timing matters, including Dr. Perlmutter’s point that caffeine has about a six-hour half-life.
- Why alcohol before bed can disrupt sleep architecture, even if it makes you feel like you fall asleep faster.
- Why this episode is not about expensive biohacking protocols, but about the foundations most people can start applying now.
Brain Inflammation and Food: The Topics Dr. Brighten and Dr. Perlmutter Discuss
One of the strongest themes in this episode is that brain health does not begin only when someone has a diagnosis. Dr. Perlmutter explains that conventional healthcare often waits until symptoms reach a threshold where a diagnosis can be made and a prescription can be offered. But the brain changes long before a person reaches that point.
He describes neuroplasticity as one of the most profound ideas in medicine: the brain is changing moment to moment. The connections between neurons are constantly being shaped by our environment, behaviors, thoughts, food, sleep, stress, and exposures. That means there is vulnerability, but also opportunity. Every day, the brain is receiving inputs that may wire it toward better or worse outcomes.
Dr. Brighten brings the conversation back to symptoms people may not immediately recognize as signs of cognitive stress. Many people think of brain health only in extremes, such as severe depression or Alzheimer’s disease. But subtle signs like forgetfulness, losing names, feeling less sharp at work, or noticing a pattern of cognitive changes may be worth paying attention to. Dr. Perlmutter emphasizes that if cognitive changes are persistent, noticeable to others, or not quickly explained by things like poor sleep or acute stress, it is reasonable to seek medical evaluation.
The conversation then moves into inflammation. Dr. Perlmutter explains that brain inflammation has been associated for decades with worse mental health, and that systemic inflammation correlates with a higher risk of depression. He discusses how infections, stress, social isolation, processed food, and metabolic dysfunction may all feed into inflammatory pathways that affect the brain.
When Dr. Brighten asks what else can cause brain inflammation beyond viruses, Dr. Perlmutter gives a useful framework: the brain’s immune system is influenced by the information coming into the body. That includes psychological stress through what we see and hear, food through the mouth, microbes through the gut, and even air quality through what we breathe.
The food portion of the episode is especially practical. Dr. Perlmutter says that your brain is made from the food you eat, and that fats and proteins are foundational. Omega-3 fats, especially DHA and EPA, are emphasized because of their role in the brain and immune regulation. He explains that omega-3s can be processed into molecules involved in resolving inflammation and that they regulate microglial cells within the brain.
Dr. Brighten then pushes him to talk about carbohydrates, and this leads to an important distinction. Your brain uses glucose, but that does not mean added sugar is good for the brain. The concern is not fruit in its whole-food form. The concern is added sugar, especially in sugar-sweetened beverages, where sugar has been removed from the fiber-rich food matrix that helps blunt the glycemic response.
The episode also covers vitamins and minerals, including B vitamins. Dr. Perlmutter notes that deficiencies in certain B vitamins, such as B1 and B12, are clearly connected to worsened cognition. He also explains that immune cells, like all cells, require adequate levels of vitamins and minerals to function properly.
Polyphenols are another major topic. Dr. Perlmutter describes them as non-caloric plant nutrients that are not vitamins, minerals, fats, carbohydrates, or proteins. They are part of the plant’s defense system, help give plant foods their colors, and are found in colorful fruits, vegetables, coffee, spices, and other plant foods. He notes that diets rich in polyphenols are associated with better outcomes, including lower rates of dementia and mental health conditions, while also clarifying that the benefit is not simply about “antioxidants.” The conversation becomes more nuanced as they discuss how polyphenols may influence immune pathways, glial cells, and epigenetic pathways.
Dr. Brighten adds an important nutrition perspective by bringing up traditional food synergy. She uses turmeric as an example, explaining that it is often eaten in dishes that include pepper, dairy, and fats—components that may help with absorption. This is a reminder that food is not just isolated compounds. Traditional dishes often combine ingredients in ways that may be more meaningful than taking a single ingredient out of context.
The gut-brain connection is one of the most important parts of the episode. Dr. Perlmutter explains that gut health is not everything, but it is deeply important. The gut microbiome can influence neurons and microglial cells, and one of the major communication pathways is the vagus nerve. Most of the vagus nerve’s connections go from the gut to the brain, suggesting that the brain is receiving large amounts of sensory information from the gut.
He also explains that the microbiome influences immune cells in the gut, which can then communicate through the bloodstream and affect the blood-brain barrier and microglial cells. This is where dysbiosis and LPS enter the conversation. Dysbiosis refers to an imbalance in the gut flora. LPS, or lipopolysaccharide, is a molecule that can create inflammatory signaling when it gets into the bloodstream. Dr. Perlmutter describes it as one of the most potent instigators of microglial activation toward inflammation.
The episode closes with practical foundations. Dr. Perlmutter is careful not to frame brain health as something that requires a complicated, expensive protocol. Instead, he talks about the next best thing: reducing sugar-sweetened beverages, getting better sleep, building meals around protein, healthy fat, and fiber, paying attention to caffeine timing, and avoiding the trap of thinking breakfast has to be sweet.
For breakfast, he emphasizes protein, healthy fats, and fiber. He gives examples like eggs, Greek yogurt, feta, black beans, avocado, olive oil, chia seeds, and other foods that can help support satiety and brain function. He also points out that many common breakfast foods are essentially junk food, and that a savory breakfast may be a better option for many people.
Dr. Brighten and Dr. Perlmutter also discuss exercise, nature exposure, air quality, social media, and sleep as additional inputs that influence the brain. While food is central, the broader message is that brain health is built from repeated daily inputs. The goal is not perfection. The goal is to identify the next realistic step that helps move the brain toward better function.
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About Dr. Austin Perlmutter
Dr. Austin Perlmutter is a board-certified internal medicine physician and New York Times bestselling author. He is known for his work in brain and body health and for exploring the biological roots of mental and physical stuckness. His work on how environmental factors shape cognitive and emotional well-being has reached millions through media outlets including PBS, Rolling Stone, and NPR.
As Managing Director of Big Bold Health, Dr. Perlmutter is involved in food-as-medicine innovation, including research on how plant nutrients may influence human aging through epigenetic pathways. In this episode, he brings a science-forward and practical perspective to the relationship between nutrition, the microbiome, inflammation, and brain health.
About Dr. Jolene Brighten
Dr. Jolene Brighten is the host of The Dr. Brighten Show. She is board certified in naturopathic endocrinology, a nutrition scientist, a certified sex counselor, and a certified menopause specialist. Through her podcast, books, and educational resources, Dr. Brighten helps people better understand their hormones, brain health, gut health, fertility, perimenopause, menopause, and whole-body wellness.
In this episode, she brings her clinical and nutrition expertise to the conversation, asking the questions listeners are likely wondering about brain fog, women’s cognitive health, inflammation, added sugar, polyphenols, gut health, and practical food choices.
FAQ: Brain Inflammation and Food
In this episode, Dr. Perlmutter discusses brain inflammation in the context of the brain’s immune system, especially microglial cells. He explains that systemic inflammation can influence the brain and that inflammatory signaling has been associated with mental health and cognitive symptoms.
According to the conversation, yes. Dr. Perlmutter explains that food provides the building blocks for the brain and can influence metabolism, immune regulation, the microbiome, and inflammatory signaling. He specifically discusses fats, proteins, carbohydrates, vitamins, minerals, polyphenols, and the microbes on food.
The episode discusses omega-3-rich foods, protein-rich foods, colorful fruits and vegetables, spices, coffee, mushrooms, Greek yogurt, eggs, black beans, avocado, olive oil, chia seeds, and other foods that may support protein, healthy fat, fiber, polyphenols, and gut health.
A major focus is added sugar, especially sugar-sweetened beverages. He explains that these drinks are far removed from whole foods like fruit, which contain fiber and are bound in a food matrix.
No. Dr. Brighten clarifies in the episode that added sugar is not the same as sugar found naturally in fruit. Dr. Perlmutter explains that fruit contains fiber and is bound in a matrix that changes how the body responds compared with sugary beverages or refined sugars.
Dr. Perlmutter explains that omega-3 fats, especially DHA and EPA, are disproportionately represented in the brain and are involved in membrane function and immune regulation. He also discusses their role in regulating microglial cells.
Polyphenols are plant nutrients found in foods like colorful fruits, vegetables, coffee, spices, and certain plants. In this episode, Dr. Perlmutter explains that they are part of the plant immune system and may influence human immune and brain health.
The episode mentions colorful fruits and vegetables, coffee, spices like rosemary, oregano, and cloves, green tea, red wine, and Himalayan tartary buckwheat. Dr. Brighten also discusses turmeric in the context of traditional food combinations.
Dr. Perlmutter explains that the gut microbiome communicates with the brain through the vagus nerve, immune signaling, the bloodstream, and interactions at the blood-brain barrier. He describes the microbiome as one of the body’s major signals about the outside environment.
Dysbiosis is described in the episode as an imbalance in the gut flora. Dr. Perlmutter explains that when there are issues with the gut immune system, molecules like LPS may enter the bloodstream and contribute to inflammatory signaling.
LPS stands for lipopolysaccharide. Dr. Perlmutter discusses it as a molecule from bacteria that can trigger inflammation when it gets into the bloodstream and may strongly activate microglial cells toward inflammation.
Dr. Perlmutter suggests thinking about breakfast in terms of protein, healthy fat, and fiber. He mentions examples like eggs, Greek yogurt, feta, black beans, avocado, olive oil, chia seeds, and other foods that support satiety and brain function.
In the episode, coffee is discussed as a source of polyphenols. Dr. Perlmutter also emphasizes timing, explaining that caffeine has around a six-hour half-life and that people may want to avoid prolonging caffeine intake into the late afternoon.
Nutrition is central, but the episode also covers stress, sleep, exercise, air quality, social media, nature exposure, and broader lifestyle inputs that may influence brain health. The throughline is that the brain responds to many signals from the body and environment.
Links Mentioned in This Episode
Brainwash by Dr. Austin Perlmutter and Dr. David Perlmutter
Dr. Victoria Sampson episode on oral microbiome and Alzheimer’s risk
Products, Books, Research, and Resources Mentioned
Omega-3 fats, including DHA and EPA
Research discussed in the episode includes:
- A Frontiers in Nutrition paper discussed by Dr. Perlmutter on polyphenols, immune signaling, glial cells, and epigenetic pathways
- UNC data referenced in the conversation regarding added sweeteners in foods and beverages
- JAMA research referenced in the conversation on steps and Alzheimer’s disease risk
- Research discussed on LPS/endotoxin, inflammation, and depressive symptoms
- Research discussed on air pollution, PM2.5, cognition, depression, anxiety, and neuroinflammation
