The Science Behind 40-Day Water Fasts: How True North Heals Chronic Disease

What if the most powerful medicine for chronic disease wasn’t a pill, but the absence of food? Dr. Csilla Veress has witnessed this “impossible” healing for over 11 years.

When Dr. Csilla Veress tells you she sees “miracles every day,” she’s not speaking in metaphors. As a naturopathic doctor at True North Health Center in California, she’s witnessed thousands of patients reverse conditions their medical teams said were irreversible—through nothing more than water, rest, and the body’s innate healing wisdom.

But this isn’t your typical intermittent fasting story. We’re talking about medically-supervised water fasts lasting anywhere from 3 to 40 days, with results that are challenging everything we thought we knew about healing chronic disease.

From Madison Avenue to Medical Miracles

Dr. Veress’s path to True North wasn’t conventional. She started pre-med but became disillusioned after working in hospitals, where she saw “doctors and nurses sicker than even patients.” Instead of healing, she witnessed a system focused on managing disease rather than addressing root causes.

So she pivoted—completely. Marketing and advertising seemed like a safer bet than the medical world that had disappointed her. For years, she climbed the corporate ladder, burning the candle at both ends until she realized she had “lost her soul.”

“I was really miserable,” Dr. Veress recalls. “I was burning the candle at both ends, and as a result, I started getting into Pilates, yoga, nutrition programs—building this foundation for health without even knowing it.”

That foundation led her to discover naturopathic medicine at Bastyr University, where she finally found what she’d been searching for a decade earlier: a medical approach focused on supporting the body’s natural ability to heal.

Why True North’s Approach Is Different

When most people think of fasting clinics, they imagine juice cleanses, supplements, enemas, and various interventions designed to “help” the body along. True North takes the opposite approach—and that’s precisely what makes it so effective.

“Nobody as far as I understand to this day is doing what we’re doing,” explains Dr. Veress. “We offer total rest, plain distilled water, and we allow the body to do what it does—which is have an inherent ability to heal. We’re watching and making sure you’re going through this safely, but we’re allowing the body to do that.”

No supplements. No electrolytes. No enemas. Just pure water and rest under medical supervision. It sounds almost too simple, but the results speak for themselves.

The Microbiome Revolution

Here’s where the science gets fascinating. Dr. Veress has become something of a “microbiome nerd,” and for good reason. The connection between fasting and gut health is revolutionizing our understanding of how healing actually works.

Consider this mind-bending fact: we have 37 trillion human cells in our bodies, but 370 trillion microbes. “We’re more of an ecosystem than we are human cells,” Dr. Veress explains. “These microbes don’t just serve a protective mechanism—they actually speak to our cells and have a vast array of basic functioning.”

When you fast, several remarkable things happen to your microbiome:

Biodiversity improves (though scientists aren’t entirely sure why yet)

Opportunistic bacteria calm down while protective bacteria multiply

Intestinal permeability heals (goodbye, leaky gut)

Short-chain fatty acid production increases, providing powerful anti-inflammatory benefits

“What I realized is if somebody really wants to understand one of the major impacts of fasting and whole food plant-based nutrition, it’s the effect on the microbiome,” says Dr. Veress. “It’s amazing.”

The Autophagy Effect

Around hour 17 of fasting, something remarkable happens in your cells. Autophagy—your body’s cellular cleanup process—kicks into high gear.

Dr. Veress uses a perfect analogy: “Imagine if I had 20 people come into my office right now and I’m trying to clean up around them. I’d do an okay job, but imagine if I kicked everybody out and did a really strong cleanup? I’d be so much more effective.”

That’s autophagy during fasting. When your body isn’t spending 80% of its energy on digestion, it can redirect that power toward:

• Cellular repair and cleanup
• Eliminating senescent (dying) cells
• Recycling cellular components that are still useful
• Enhancing detoxification pathways
• Reducing inflammatory cytokines

What Conditions Respond to Fasting?

True North treats a wide spectrum of conditions, but they all share one common denominator: chronic inflammation. The most common include:

Metabolic diseases: Heart conditions, high blood pressure, Type 2 diabetes

Cancer: Particularly follicular lymphoma and non-aggressive prostate cancers during “watch and wait” periods

Inflammatory conditions: IBD, Crohn’s disease, ulcerative colitis, IBS

Other conditions: Mast cell activation syndrome, kidney disease (when safe), osteoarthritis, gastroparesis

“No matter where you are in the body and no matter what the diagnosis is, the underlying piece is chronic inflammation,” Dr. Veress notes. “Then we have to figure out why the chronic inflammation is there.”

The Psychology of Transformation

Here’s what might surprise you: the biggest challenge isn’t hunger—it’s boredom.

“In the 11 years I’ve been here, the only time I’ve really seen somebody struggle is actually in the newer generations, because what I’ve seen more of is people saying, ‘How do I do nothing? This is so boring,'” Dr. Veress observes.

We’ve become so addicted to constant stimulation that sitting with ourselves becomes the real challenge. But this is precisely where the magic happens. True North’s environment removes you from your triggers, your normal routines, and your access to food as a coping mechanism.

“When you come to True North, you make a decision,” she explains. “When people put money behind it and say ‘I’m booked, I’m spending money to be there,’ there’s a flip that goes on. Plus, you’re surrounded by other fasters. Everybody is fasting. Your whole support team is there to help you fast.”

The Stress Factor

Perhaps the most revealing insight from Dr. Veress’s work is this: when patients return for follow-ups, 85-90% cite stress as their biggest obstacle to maintaining their health improvements.

“Deaths in the family, COVID, promotions where they’re working more, demotions where they’re stressed out—something happens in their lives where they’re not taking time out, not paying attention to their stress load. And what do we do? We eat. We use alcohol, drugs, we’re not sleeping as well.”

This highlights a crucial point often missed in health discussions: you can’t optimize one pillar of health while ignoring others. Nutrition, exercise, sleep, stress management, community, and purpose all work together.

Starting Your Own Health Transformation

Not everyone needs a 40-day fast to transform their health. Dr. Veress recommends starting with one simple question: “What is your biggest obstacle to your health?”

This helps you identify where to focus first:

• If it’s food access, start with what’s available and affordable
• If it’s stress, work on identifying and managing your specific triggers
• If it’s movement, begin with walking or basic stretching
• If it’s hydration, add one extra glass of water daily

“What I find is that even if somebody says ‘I can drink more water,’ perfect. If somebody is more hydrated during the day, they’re going to feel better already,” Dr. Veress explains. “And then you can build on that.”

The key is creating what she calls a “stack of wins”—small, consistent victories that build trust in your ability to change and create momentum for bigger transformations.

The Future of Healing

Dr. Veress’s work represents a growing movement in medicine—one that recognizes the body’s remarkable capacity for self-healing when given the right conditions. As our understanding of the microbiome deepens and fasting research expands, we’re discovering that some of our most powerful medicines have been with us all along.

“I don’t think I would have been as effective of a doctor if I didn’t go through what I went through,” Dr. Veress reflects on her own journey. “I can see myself in every patient that walks through the door because there’s something about their story where I’m like, ‘I get that. I totally get that.'”

That combination of scientific rigor, personal experience, and deep compassion is exactly what the future of medicine needs—practitioners who understand that true healing happens not just in the body, but in the whole person.

Whether you’re dealing with chronic illness or simply want to optimize your health, Dr. Veress’s message is clear: your body knows how to heal. Sometimes, the most powerful thing you can do is simply get out of its way.

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Dr. Csilla Veress practices at True North Health Center (healthpromoting.com) and offers consultation through her personal practice (DrCsillaVeress.com). True North provides medically-supervised fasting programs and whole food plant-based nutrition education.