About David Wiss PhD
Dr. David Wiss is an independent thinker unafraid to challenge the status quo in the nutrition field. Dr. Wiss pioneered the field of nutrition for addiction recovery and is a world-renowned expert in disordered eating. His mental health research bridges gaps between neurological, psychological, behavioral, and nutritional sciences.
Dr. David has treated over 1,000 patients in the last twelve years using a food-positive functional medicine approach through his practice, Nutrition In Recovery. Dr. Wiss has developed innovative methods for using nutrition to improve mental health without feeling like a “diet.” Dr. Wiss believes gut health is the key to brain health and wants to show you how to heal yourself and help your clients.
Services
Dr. David Wiss brings his twelve years of experience as a mental health nutritionist to patients, treatment facilities, institutions, academics, and the press.
Treatment
Individual and family counseling, functional medicine, group facilitation
Consulting
Professional supervision, staff training, expert opinion/quote
Speaking
Academic conferences, podcasts, wellness workshops
Collaboration
Joint efforts on research, statistical analysis, manuscript writing
Research
With over 20 peer-reviewed journal publications, Dr. Wiss is dedicated to disseminating his findings and progressive perspectives at the intersection of nutrition and mental health.
Can intuitive eating be helpful to individuals with ultra-processed food addiction?
Intuitive Eating can be used in conjunction with other treatment modalities as a harm-reduction approach to reduce…
Abstinence-based treatment of comorbid eating disorders and ultra-processed food addiction
The evidence that ultra-processed food addiction exists and is impacting a subset of our clients with disordered…
Low carbohydrate and psychoeducation programs show promise for food addiction: 12-month follow-up
The current data demonstrate the long-term clinical effectiveness of a low carbohydrate “real food” intervention delivered in…
Training
Dr. Wiss is available to provide trainings to your staff or organization on mental health nutrition, addictions, disordered eating, and more.
Podcasts
If you would like to feature Dr. Wiss on your podcast, please send a message and we will gladly discuss a collaboration with you.
Blog
Capturing the larger systemic issues in the field, these blogs point to public health solutions. There exists great opportunity to integrate nutrition into behavioral health.
The White House Just Changed Psychedelic Policy. Here’s What That Actually Means — And What It’s Missing
From The Socials
Your emotional relationship with food wasn’t an accident. It was engineered by the same industry that spent decades hiding what cigarettes did to people.
A March 2026 paper in the New England Journal of Medicine documented how tobacco executives were installed to run major food companies in the 1980s, applying the same psychological tactics they’d perfected on cigarettes to what we eat (DOI: 10.1056/NEJMms2507028).
Meanwhile, new research in the journal Obesity found that 66% of food addiction symptoms are explained not by craving junk food, but by anticipating that eating vegetables will make you feel worse (DOI: 10.1002/oby. 70177). They didn’t just make their products irresistible. They made real food feel threatening.
This is what a hijacked anticipatory system looks like. It has a biology. And it has a history.
#foodaddiction #functionalmedicine
I won’t pretend the first version was ready. Early users hit real bugs. Some got frustrated and left. That’s on me.
So I did something I didn’t expect — I learned to own the code myself and rebuilt everything that wasn’t working. No investors. No large team. Just a belief that nutritional psychology deserves a real tool.
Wise Mind Nutrition v3 is live. Swipe to see what’s inside. →
Three AI features. A clinical admin panel for practitioners. And a core message that hasn’t changed: I’m not the guru. My job is to help you find yourself.
If you’ve tried this before and got frustrated — give it another shot. It’s official now.
📲 Download on iOS and Android
💬 Send me your username. I’m in the app every day.
#wisemindnutrition
Something huge happened last week, and my reaction is complicated — which is exactly why I had to gather my thoughts. Overall, I think we’re moving in the right direction.
The research on psilocybin and ibogaine is genuinely compelling. For treatment-resistant depression, PTSD, and addiction, this door opening matters.
But we’ve watched this movie before. A powerful natural medicine gets discovered, patented, standardized — and the nuance disappears.
What the FDA’s fast-track criteria don’t account for is your unique biology — and those are exactly the variables I’m trained to think about. Psychedelic outcomes aren’t uniform, and the variation tracks with nutritional status, inflammation, gut-brain function, methylation, and cortisol patterns. These are active variables — not background noise.
Neuroplasticity is sensitive to metabolic conditions. Serotonin synthesis depends on tryptophan and B-vitamin status. Chronic neuroinflammation changes how an altered state is processed.
The better question has never been “did symptoms decrease?” It’s whether the person was prepared, supported, and tended to in the months after. I’m here for the nuance. Always have been. Always will be.
#PsychedelicMedicine #FunctionalMedicine #MentalHealthScience #TreatmentResistant #GutBrainAxis
You’ve been told you’re “treatment-resistant.” But when nobody has tested your gut, your hormones, your nutrient status, your genetics, or your cortisol patterns — what exactly has been tried?
At FxMed Mental Health, we specialize in the cases conventional psychiatry hasn’t solved — not because those cases are impossible, but because the right questions haven’t been asked yet.
If this resonates, save this post. Share it with someone who needs to hear it.
Book a free discovery call to unpack what this means for you 🫶🏼
#FunctionalMedicine #MentalHealthMatters #RootCauseResolution #TreatmentResistant
#GutBrainAxis
13 years of clinical work. A PhD. Training with the Institute for Functional Medicine. Custom AI models. And one realization: the future of mental health care requires a completely different approach.
Today I’m proud to announce FxMed Mental Health — a 6-month functional medicine program I built alongside a psychiatrist and health psychologist. We’re treating root causes, not just symptoms.
If you know someone stuck in the cycle of treatment-resistant mental health conditions, please share this. And if you want to talk — about the work, about collaboration, about anything — my door is open.
Deep love ❤️
#FunctionalMedicine #MentalHealth #NutritionalPsychiatry #RootCauseMedicine #IntegrativePsychiatry
Auto-Brewery Syndrome
This one stopped me in my tracks.
Auto-Brewery Syndrome. Your gut bacteria literally fermenting sugar into alcohol — inside your body — without you ever taking a drink.
People losing jobs, getting DUIs, having their families think they’re lying about drinking. For decades, doctors dismissed it. Patients were told it was in their heads.
It’s not in their heads. It’s in their gut.
A brand new study in Nature Microbiology (PMID: 41507585) finally mapped what’s happening at the microbial level — E. coli and Klebsiella pneumoniae overgrowth, fermentation genes switching on during flares, blood alcohol levels hitting nearly 3x the legal limit from endogenous production alone. And here’s what really got me: a fecal microbiota transplant put one patient into complete remission. 16 months and counting.
But here’s where it gets even more interesting for those of us working in mental health. Researcher Alan Logan and his team have been connecting the dots between gut microbial metabolism and cognition, impulse control, aggression, and mood. They coined the term “legalome” — because this science is literally changing outcomes in courtrooms (PMID: 41008344). DUI charges dismissed. The gut-brain axis isn’t a wellness buzzword anymore. It’s evidence.
Now — is Auto-Brewery Syndrome common? No. But the underlying mechanism — dysbiotic bacteria producing neuroactive metabolites that mess with your brain — that is incredibly common. And most people have no idea it’s happening.
This is exactly why I built a practice around comprehensive gut testing. If you’ve been dealing with unexplained brain fog, mood instability, cognitive issues — especially after antibiotics — the answer might not be in your head. It might be in your microbiome.
#autobrewerysyndrome
New research just dropped in Science Advances (PMID: 41616060) confirming something I’ve been passionate about for a long time: the vagus nerve plays a direct role in dopamine reward signaling 🤯
Let me say that again — your GUT is shaping how your brain experiences pleasure and motivation. This ain’t woo. This is neuroscience 🧠
As someone who works at the intersection of nutrition, mental health, and addiction, this hits. So many of the clients I’ve worked with over the years have had significant GI issues alongside their mental health struggles. And for too long, we’ve treated those as separate problems.
They’re not.
The vagus nerve — “the wanderer” — connects it all. And when it’s compromised by trauma, chronic stress, or dysbiosis, it sets the stage for everything from disordered eating to substance use.
The encouraging part? Vagal tone is something we can influence. Breathwork, yoga, cold exposure, mindful eating, gut-supportive nutrition — these aren’t just wellness trends. They’re evidence-informed strategies for healing the gut-brain axis.
If you or someone you know is in recovery, dealing with chronic gut issues, or working through trauma — this is worth grasping.
Drop a 🧠 if you learned something new.
#VagusNerve #GutBrainAxis #Addiction
I came into the nutrition field believing we could change things. Better food, better health, better outcomes — it felt straightforward enough. But the more I learned, the more I realized the system wasn’t broken. It was working exactly as designed — just not for the people it’s supposed to serve.
So I started studying why. Why do well-intentioned efforts keep failing? Why does the science get ignored? Why do the companies causing the most harm keep getting more powerful?
The answer has a name: the commercial determinants of health. It’s the framework that explains how corporate actors shape our food environment, influence our professional organizations, fund the research that suits their interests, and lobby against the policies that would actually protect people.
This article from Knowable Magazine lays out something I’ve been talking about for years — we don’t even track corporate crime the way we track street crime. There’s no centralized database. No national statistics. The last comprehensive federal report was from 1979. That’s not an accident. That’s by design.
But here’s what gives me hope: the conversation is shifting. Researchers, clinicians, and advocates are connecting these dots in ways that weren’t happening even five years ago. Legislation is being reintroduced. People are waking up to the fact that their health struggles aren’t just personal failures — they’re predictable outcomes of a system that prioritizes profit over wellbeing.
It’s an uphill battle. It always has been. But for the first time in my career, it actually feels like we’re gaining ground.
Are you feeling optimistic or nah?