In this post, we’ll explore the F.X. Mayr method, the key fasting misconceptions Dr. Henning Sartor addresses, and how gut-focused nutrition (especially fiber and fermented foods) may support appetite regulation in a sustainable way.
Prefer to listen instead of reading? Watch the full conversation where Julia Gruber (Arktis BioPharma Switzerland, Co-Founder & Gut Health Expert) interviews Dr. Henning Sartor (UPGRADERS® Chief Medical Advisor) about GLP-1, gut health, fasting, and sustainable metabolic support.
The Gut’s Central Role in Whole-Body Health
The gut doesn’t just digest food. It communicates with the brain, the immune system, and many organs — often described as the gut–brain axis, gut–skin axis, or even a “gut–everything axis.”
Dr. Henning Sartor emphasizes that gut health can influence the whole body’s function and resilience — which is why focusing on the intestinal environment can be a foundational strategy, especially in chronic health challenges.
“The intestine plays a very central role. All organs are connected and influenced by the gut.”
A practical takeaway: improving gut conditions often starts with reducing irritants, supporting digestive rest, and rebuilding a healthier microbiome with the right nutrition and habits.
Why Conventional Approaches Often Miss the Root Cause
A common belief is that fasting equals starvation — and that it inevitably causes muscle loss or harms the body. Dr. Sartor’s perspective is different:
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Fasting isn’t the same as starving when it’s structured and supervised.
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The goal is not deprivation, but regeneration and a reset of metabolic signals.
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The gut’s role in immunity, inflammation, and appetite signals is often underestimated in conventional “eat less, move more” approaches.
The key is how fasting is done: extreme restriction without a plan is risky; a structured approach is not the same thing.
The F.X. Mayr Method: A Gut-Focused Fasting Approach
The F.X. Mayr method is a long-established medical fasting system with a strong emphasis on gut function. Unlike many fasting trends focused only on calorie reduction, Mayr medicine prioritizes:
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Digestive rest
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Cleansing and relief for the gut
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Training better digestion (including chewing and pacing)
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Rebuilding the gut environment
This is often summarized as:
Rest • Cleanse • Train • Substitute
A major reason this approach stands out is that it treats the gut as a key driver of metabolic balance — not just a passive “food tube.”
Addressing the Big Fasting Fears
“Fasting is dangerous”
Fasting can be unsafe in certain situations — but blanket statements miss the nuance. A well-designed protocol includes appropriate timing, food quality, hydration, and (when needed) medical supervision.
“Fasting destroys muscle”
Muscle loss is not inevitable, especially with:
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adequate protein during re-feeding phases
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appropriate resistance training
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not fasting too aggressively or too long
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personalization based on age, health status, and goals
“Women shouldn’t fast — especially around menopause”
Dr. Sartor disputes the idea that fasting automatically disrupts hormones. He points to the role of receptors and cellular regulation, and shares observations from women in midlife who did structured programs periodically.
(Important note: individual responses vary; women with thyroid issues, eating disorder history, pregnancy/breastfeeding, or certain medications should seek medical advice before fasting.)
Weight-Loss Injections and GLP-1: What They Do — and What They Don’t Fix
Many weight-loss injections work by mimicking or amplifying GLP-1, a hormone that helps regulate appetite and satiety. The result is often a strong “I’m full” signal — and fast appetite reduction.
But Dr. Sartor highlights a key long-term issue: when appetite drops sharply, people often reduce not only calories, but also micronutrients and fiber. And fiber is essential for a healthy gut microbiome.
Over time, reduced fiber intake can shift the microbiome in an unfavorable direction — which may contribute to the rebound effect many people experience when reducing the dose or stopping injections.
The Natural Alternative: Supporting GLP-1 Through the Gut
Instead of forcing satiety pharmacologically, the interview explores how gut conditions may support natural GLP-1 production.
A key mechanism involves short-chain fatty acids (like butyrate), which are produced when beneficial gut bacteria ferment dietary fiber and certain fermented foods. These compounds can support gut signaling and metabolic regulation.
Practical focus areas:
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Eat enough dietary fiber (from vegetables, legumes, seeds, whole foods)
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Include fermented foods as tolerated
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Create consistency over time, not quick extremes
A Practical, Home-Based Option: The 21-Day Gut & Metabolism Reset
The goal isn’t “instant weight loss.” It’s building a stable metabolic state that supports:
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fewer cravings
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more stable appetite signals
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more consistent energy
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reduced rebound risk after the program
Many people report they feel naturally less hungry as food choices, chewing behavior, and blood sugar patterns improve. When your gut environment improves, appetite regulation and metabolism often follow.
Our 21-day Gut-to-Energy reset™ kit ensures a thorough cellular-level detox, perfectly aligned with the body's natural 21-day regeneration cycle:
- Week 1: Repair - Cleansing the gut and restoring pH balance.
- Week 2: Restore - Detoxifying the blood and enhancing cellular nutrition.
- Week 3: Renew - Revitalizing tissues by cleansing the extracellular matrix.
Only a detoxified body can heal, lose weight, sleep better, look younger, and thrive!
