I'm in Texas, so I hear this at the pharmacy almost every week. Somebody tells me they went gluten-free. Then a minute later they mention the corn tortillas they had at lunch and the oatmeal they eat every morning. They did what they were told to do, and they still feel bloated and foggy and can't figure out why.
I got to dig into exactly that with Dr. Steven Gundry on this episode of The Trusted Pharmacist. He's a former cardiothoracic surgeon and the author of The Plant Paradox, and my mentor and I have followed his work for years. If you've gone gluten-free and you're still not well, this conversation explains a lot. It also names some of the "healthy" foods that might be the reason your gut hasn't settled down.
Why Gluten-Free Isn't the Whole Story
Gluten gets all the attention. What most people don't know is that gluten belongs to a much bigger family of plant proteins called lectins. When you pull wheat off your plate, you've dealt with one member of that family and left the rest of them sitting there.
Dr. Gundry starts the explanation with the plants. A plant can't run from something that wants to eat it, so it fights back with chemistry. Lectins are part of that chemistry. In insects, they interfere with nerve signaling and cause paralysis. As a pharmacist I'll admit I have some respect for that. Plants have been doing this a lot longer than we've been making drugs.
Humans just haven't been around most of these plants very long. Grains came into our diet somewhere around 10,000 to 12,000 years ago. Nightshades and corn didn't reach most of the world until about 500 years ago. The cultures that ate these foods for generations figured out how to make them safer. Italians peeled and deseeded their tomatoes. Native Americans in the Southwest peeled and deseeded their peppers. Across Asia, people took the hull off rice, and that hull is where the lectins live. Corn got boiled in lime to make hominy long before anybody ground it into masa. We dropped all of that and started eating the raw versions because they were labeled whole foods.
The patient that made him take this seriously was a friend he calls Tony. Tony had vitiligo on his face and his hands. Vitiligo is autoimmune, and the cells getting attacked are nerve-derived, which is the same kind of tissue lectins go after in insects. Tony cut lectin-heavy foods and the vitiligo cleared up in six months. Five years later it came back. He'd drifted, because the diet was hard. So he did it again. Six months later, gone again.
What You Actually Need to Know
Corn and oats cross-react with gluten
This is the one that gets the gluten-free crowd. Dr. Gundry told me that every single one of his patients with a leaky gut has antibodies to gluten. Not most of them. All of them. And about 70 percent of the people who react to gluten also react to corn and to oats, because oats carry a protein that looks enough like gluten to set off the same response. So your gluten-free oatmeal and your corn chips may be keeping the fire going. I've been telling patients for years that corn is basically a weed on a stalk. Now I have a better argument for it.
Cutting back doesn't work when your immune system is primed
He told me about a man he'd seen that same morning. Bad rheumatoid arthritis, several joint replacements, and two immunosuppressant drugs that were originally developed for transplant patients. His testing showed a leaky gut and a strong reaction to gluten. He also loves beer, so the first thing Dr. Gundry asked him to do was give it up. Three months later his uric acid was high and his leaky gut markers hadn't moved. Turns out he'd switched to light beer. Less gluten, so he figured he was fine.
For him, a few molecules was plenty. I explain this to my patients with the flu shot. You get one small exposure and your immune system stays revved up for months. It's the same immune system doing the same job. Being "mostly" gluten-free is a different experiment than being gluten-free, and it gives you a different answer.
Sourdough and pressure cooking don't fix gluten
I wish I had better news here. Fermentation breaks down most lectins, which is why fermented quinoa is a different food than the raw stuff. Gluten is the exception. Sourdough is no safer than regular bread. Pressure cooking, which takes care of the lectins in beans, doesn't touch the gluten molecule either. He's tried both with his own patients and checked the labs.
Your microbiome was the defense line, and it's been thinned out
So why can your neighbor eat all this and feel fine while you can't? A lot of it comes down to gut bacteria. We used to carry microbes that actually like eating gluten and oxalates. Decades of antibiotics, including everything fed to livestock, wiped out a big share of them. Glyphosate finished the job. It was patented as an antibiotic before anyone thought to use it as a weed killer, and it's sprayed on most conventional grain crops, corn and oats included.
Dr. Gundry put it in football terms. Your gut bacteria are the offensive line, your gut wall is the quarterback, and lectins are the linebackers. Lose the line and it doesn't matter how good your quarterback is. This is exactly why I always start with the gut. If that wall isn't repaired, you can keep pulling foods out of your diet for years and never get ahead of the symptoms.
Not everyone reacts to the same foods
Dr. Gundry runs lectin and food sensitivity panels through Vibrant Wellness, and he was clear that these are sensitivities, not allergies. Some of his patients react to nearly everything on the panel. Some barely react at all. What surprised me was which foods keep showing up. Ginger is on the list for about 40 percent of his patients, and ginger is what everybody reaches for when their stomach is upset. Lemons and cinnamon come up a lot. White onions react and yellow onions usually don't. His book Gut Check has the twelve biggest troublemakers he sees, but his point was that yours might not be on that list at all.
What to Do Next
Run the whole experiment, not half of it. If you've been gluten-free and you're still not feeling right, take corn and oats out along with the wheat. All the way out, not the light beer version. Give it a real stretch of time like Tony did and pay attention to what shifts. Your body will tell you. You just have to give it a clean enough test to hear the answer.
Feed the defense while you're at it. Polyphenols are food for the bacteria that protect your gut wall. The bacteria break them down and pass the benefit along to you. Dr. Gundry starts people with a polyphenol-rich extra virgin olive oil, and it's about as simple as a daily habit gets. And if you'd like to know how much inflammation you're actually dealing with before you change anything, the OmegaQuant AA/EPA ratio blood test will give you a real number instead of a guess.
When Cutting Foods Isn't Getting You Anywhere
Going gluten-free is one of the most common changes people make on their own, and one of the ones that stalls most often. Usually the idea wasn't wrong. Nobody explained the rest of it, that corn and oats were still on the plate and that the gut wall needed repairing first.
I see the same thing with almost every part of health.
You grab one piece of advice from a video and another from something you read at midnight, and neither one tells you how your body works as a whole.
The Magnolia Inner Circle exists to fix that.
It's where you can bring your questions to pharmacists who will actually answer them, and start seeing how your gut connects to everything downstream, so you stop running experiments on yourself without a plan.
Members also get challenges, deeper trainings on topics like this one, a community working through the same things you are, supplement discounts, and resources built to help you make better decisions with less guesswork.