“
Dr. Shustina is an incredibly knowledgeable doctor who truly takes time to find root cause.
RG
Rochel Gordon
Condition · Gastrointestinal
Small Intestinal Fungal Overgrowth (SIFO)
Persistent bloating, brain fog, and unexplained digestive symptoms that don't respond to typical treatments aren't just mysterious ailments—they may signal Small Intestinal Fungal Overgrowth (SIFO), a condition affecting approximately 25% of patients with unexplained gastrointestinal symptoms yet remaining largely underdiagnosed in conventional medicine. Research shows that 97% of SIFO cases involve Candida species, which can form protective biofilms and disrupt normal gut function when overgrown due to factors like antibiotic use, compromised immunity, and gut microbiome imbalances. Our comprehensive approach addresses the root causes through targeted gut microbiome restoration, immune system support, and natural antifungal protocols to achieve lasting resolution without recurrence.
What Exactly Is SIFO?
Small Intestinal Fungal Overgrowth (SIFO) occurs when excessive fungal organisms, predominantly Candida species, proliferate in the small intestine where they normally exist in minimal quantities. Unlike the large intestine which harbors diverse microbial communities, the small intestine typically maintains fewer than 100 fungi per milliliter of fluid under healthy conditions. When factors such as antibiotic use, immunosuppression, proton pump inhibitor use, or gut microbiome disruption create favorable conditions, fungi can overgrow and form resistant biofilms that damage the intestinal lining and interfere with digestion, nutrient absorption, and immune function. SIFO often coexists with SIBO and shares similar symptoms, making comprehensive gut health assessment essential for proper diagnosis and treatment.
Types and Presentations of SIFO
SIFO manifestations vary based on underlying causes, fungal species involved, and individual immune status, each requiring specific assessment and targeted treatment approaches.
| Type | Primary Characteristics | Common Contributing Factors | Considerations |
|---|---|---|---|
| Immunocompromised SIFO | Severe overgrowth in patients with weakened immune systems | HIV/AIDS, immunosuppressive medications, cancer treatment | Requires aggressive antifungal treatment with immune system support |
| Antibiotic-Induced SIFO | Fungal overgrowth following broad-spectrum antibiotic use | Disrupted bacterial competition, loss of beneficial bacteria | Focus on microbiome restoration and competitive inhibition |
| PPI-Associated SIFO | Overgrowth related to reduced stomach acid production | Proton pump inhibitor use, hypochlorhydria | Address acid production and medication review when possible |
| Metabolic SIFO | Overgrowth in patients with diabetes or metabolic dysfunction | High sugar intake, insulin resistance, poor glycemic control | Requires metabolic optimization and dietary modification |
Why SIFO Impacts More Than Digestive Health
SIFO affects multiple body systems due to the small intestine's crucial role in nutrient absorption, immune surveillance, and the gut-brain axis connection. Fungal overgrowth can damage the intestinal lining, leading to increased intestinal permeability and allowing toxins and undigested particles to enter systemic circulation, triggering widespread inflammation and immune responses. The biofilms formed by Candida species can sequester nutrients and produce mycotoxins that affect neurological function, contributing to brain fog, mood changes, and cognitive difficulties. Additionally, chronic fungal overgrowth depletes beneficial bacteria that support immune function, neurotransmitter production, and metabolic health, creating a cascade of systemic dysfunction that extends far beyond the digestive tract.
Common Signs of SIFO Include
Gastrointestinal Symptoms:
- Chronic bloating and abdominal distension
- Gas, flatulence, and digestive discomfort
- Diarrhea, loose stools, or alternating bowel patterns
- Nausea, vomiting, and poor appetite
- Acid reflux, heartburn, and indigestion
- Abdominal pain and cramping
Neurological and Cognitive Symptoms:
- Brain fog, difficulty concentrating, and memory issues
- Chronic fatigue and lethargy
- Headaches and migraines
- Anxiety, depression, and mood swings
- Sleep disturbances and restlessness
Systemic and Immune Symptoms:
- Recurrent fungal infections (oral thrush, vaginal yeast infections)
- Skin issues including rashes, eczema, and fungal skin infections
- Food sensitivities and allergic reactions
- Frequent infections and compromised immune function
- Sugar and carbohydrate cravings
Signs of Intestinal Permeability:
- Multiple food sensitivities developing over time
- Environmental sensitivities and chemical intolerance
- Joint pain and muscle aches
- Autoimmune symptoms and inflammatory markers
- Nutrient deficiencies despite adequate intake
Diagnostic Options at Whole Gut Health
Comprehensive SIFO evaluation requires specialized testing to identify fungal overgrowth and assess underlying contributing factors. At Whole Gut Health, we use advanced diagnostics to create personalized treatment protocols that address root causes.
Testing options may include:
Applied Kinesiology (muscle testing) to help with precisely delineate diagnosis, root causes, and treatment options
Comprehensive Stool Analysis to identify candida species
Candida Antibody Testing (IgA, IgG, IgM) to assess immune response to Candida overgrowth and chronic exposure.
SIBO Breath Testing since SIFO frequently coexists with bacterial overgrowth and requires concurrent treatment.
Comprehensive Digestive Analysis including assessment of digestion including markers of malabsorption and maldigestion
Immune Function Assessment to evaluate factors contributing to fungal susceptibility including complete blood count and inflammatory markers.
Organic Acids Testing to identify fungal metabolites and assess overall metabolic function affected by overgrowth.
We customize testing protocols based on your symptom pattern, medical history, and suspected contributing factors to ensure comprehensive evaluation and optimal treatment planning.
Our approach
Why Whole Gut Health is different
At Whole Gut Health, we go beyond conventional symptom management and traditional functional medicine protocols. We trust your body's innate ability to heal itself when given the right support.
In Dr. Shustina's many years of practice, she has seen that many digestive diseases have their root cause in emotional traumas and unhealed wounds. When these underlying causes are healed, the body can heal from the inside out in a lasting way.
We focus on the mind-gut connection, incorporating energy healing techniques, personalized nutrition that evolves as you heal, and integrative approaches addressing mind, body, and spirit. If this resonates with you, contact our office to schedule your consultation and take the first step on your healing journey.
Our SIFO Treatment Approach
Our Three-Phase SIFO Resolution Protocol Includes:
Phase 1 — Assessment and Root-Cause Identification
- Comprehensive evaluation of fungal overgrowth and root causes
- Detailed analysis of immune function, gut health, and contributing factors
- Antibiotic history and gut microbiome disruption
- Immune system dysfunction and immunosuppressive factors
- Medications affecting stomach acid and gut environment
- Dietary factors promoting fungal growth (high sugar, refined carbohydrates)
- Intestinal motility disorders and structural abnormalities
- Stress and lifestyle factors compromising immune function
Phase 2 — Targeted Intervention
- Individualized supportive protocols: Customized approach of empowering the body to heal itself based on each person’s individual composition and root cause
- Visceral manipulation: Targeted manual therapy to empower the organs optimal motility and function
- Energy Medicine: Increasing the body’s vibrational frequency to empower the body to heal itself.
- Antifungal Protocols: Strategic use of natural antifungals, herbs, supporting supplements
- Gut Microbiome Restoration: Targeted probiotics and prebiotics to restore competitive bacterial populations and inhibit fungal regrowth
Phase 3 — Rebuilding and Prevention
- Immune System Support: Comprehensive nutritional and lifestyle interventions to strengthen immune function and natural antifungal defenses
- Anti-Inflammatory Protocols: Dietary modifications and natural compounds to reduce intestinal inflammation and promote healing
- Sustained Gut Health: Long-term protocols for maintaining optimal bacterial-fungal balance and preventing recurrence
- Immune Optimization: Ongoing support for immune system function to maintain natural resistance to fungal overgrowth
- Dietary Maintenance: Sustainable nutritional strategies that discourage fungal growth while supporting overall health
- Lifestyle Integration: Stress management, sleep optimization, and environmental modifications to support lasting improvement
- Monitoring and Prevention: Regular assessment to detect early signs of recurrence and maintain optimal gut health
Expert-Led, Personalized Care
Dr. Alexandra Shustina is a board-certified gastroenterologist and internist specializing in complex digestive disorders, gut health, and the gut–brain connection. Drawing from both conventional gastroenterology and integrative medicine, she takes a comprehensive approach to uncovering the underlying factors contributing to illness and guides patients toward lasting wellness.
At Whole Gut Health, every patient receives highly personalized care rooted in a deep understanding of digestive health, nutrition, the gut microbiome, and the interconnected systems that influence overall well-being. By combining evidence-based medicine with a thoughtful, individualized approach, we help patients move beyond symptom management and create a clear path toward long-term healing and vitality.
Frequently Asked Questions
Common questions, answered
What is SIFO?
+
SIFO (Small Intestinal Fungal Overgrowth) occurs when excessive fungal organisms, predominantly Candida species, proliferate in the small intestine where they normally exist in minimal quantities. This overgrowth can form protective biofilms, damage the intestinal lining, and interfere with digestion, nutrient absorption, and immune function, leading to a wide range of systemic symptoms.
What are the different types of SIFO?
+
Immunocompromised SIFO
- Primary characteristics: Severe overgrowth in patients with weakened immune systems
- Contributing factors: HIV/AIDS, immunosuppressive medications, cancer treatment
- Requires aggressive antifungal treatment with immune system support
Antibiotic-Induced SIFO
- Primary characteristics: Fungal overgrowth following broad-spectrum antibiotic use
- Contributing factors: Disrupted bacterial competition, loss of beneficial bacteria
- Focus on microbiome restoration and competitive inhibition
PPI-Associated SIFO
- Primary characteristics: Overgrowth related to reduced stomach acid production
- Contributing factors: Proton pump inhibitor use, hypochlorhydria
- Address acid production and medication review when possible
Metabolic SIFO
- Primary characteristics: Overgrowth in patients with diabetes or metabolic dysfunction
- Contributing factors: High sugar intake, insulin resistance, poor glycemic control
- Requires metabolic optimization and dietary modification
What are the common signs and symptoms of SIFO?
+
Gastrointestinal: Chronic bloating, gas, diarrhea, nausea, acid reflux, abdominal pain
Neurological: Brain fog, chronic fatigue, headaches, anxiety, sleep disturbances
Systemic: Recurrent fungal infections, skin issues, food sensitivities, frequent infections, sugar cravings
Intestinal Permeability Signs: Multiple food sensitivities, environmental sensitivities, joint pain, autoimmune symptoms, nutrient deficiencies
How is SIFO diagnosed?
+
Comprehensive evaluation includes multiple assessment approaches:
Applied Kinesiology (muscle testing) to help with precisely delineate diagnosis, root causes and treatment options
Comprehensive Stool Analysis
- Identifies Candida species
Candida Antibody Testing
- Assesses immune response to Candida overgrowth
SIBO Breath Testing
- Since SIFO frequently coexists with bacterial overgrowth
Comprehensive Digestive Analysis
- Evaluates digestive enzymes, markers of malabsorption and maldigestion
Organic Acids Testing
- Identifies fungal metabolites and metabolic dysfunction
Testing protocols are customized based on symptoms and suspected contributing factors.
What does SIFO treatment involve?
+
Our comprehensive three-phase SIFO resolution protocol includes:
Phase 1: Assessment and Root-Cause Identification
- Comprehensive evaluation of fungal overgrowth
- Detailed analysis of immune function and gut health
- Identification of underlying causes including antibiotic history, immune dysfunction, medications, and dietary factors
Phase 2: Targeted Intervention
- Individualized supportive protocols: Customized approach of empowering the body to heal itself
- Visceral manipulation: Targeted manual therapy to empower each digestive organs motility
- Energy Medicine: Increasing the body’s vibrational frequency to empower the body to heal itself.
- Antifungal protocols using natural and supportive agents
- Gut microbiome restoration with targeted probiotics and prebiotics
- Immune system support and anti-inflammatory protocols
Phase 3: Long-Term Prevention and Microbiome Balance
- Sustained gut health protocols for maintaining optimal bacterial-fungal balance
- Immune optimization for natural resistance to fungal overgrowth
- Dietary maintenance strategies and lifestyle integration
- Monitoring and prevention to detect early signs of recurrence
Why do fungi form biofilms and how does this affect treatment?
+
Candida and other fungi form biofilms as protective matrices that make them resistant to both antifungal treatments and immune responses. These biofilms allow fungi to persist despite treatment and contribute to chronic infections. Effective SIFO treatment may require strategies using natural compounds and food as medicine sources to disrupt the biofilm.
Can SIFO be completely resolved?
+
Yes, SIFO can be successfully resolved with comprehensive treatment addressing root causes. However, lasting resolution requires more than just antifungal treatment—it necessitates gut microbiome restoration, immune system optimization, and addressing underlying factors that allowed fungal overgrowth initially. Our approach focuses on creating an environment in which SIFO cannot form.
What makes your approach to SIFO treatment different?
+
At Whole Gut Health, we take a comprehensive approach to SIFO that goes beyond antifungal treatment:
- We focus on empowering the body to heal itself.
- Focus on root-cause resolution rather than symptom suppression
- Integration of conventional gastroenterology with functional medicine approaches, mind body connection, and energy healing methods
- Comprehensive gut microbiome restoration to prevent recurrence
- Immune system optimization for natural antifungal resistance
- Personalized protocols based on individual contributing factors and sensitivities
Who provides SIFO care at your practice?
+
Dr. Alexandra Shustina is a board-certified gastroenterologist and internist who serves as Miami's premier gut health specialist. She has training in both conventional gastroenterology and functional gut health, with expertise in the gut microbiome and its role in health and wellness.
How do I get started with SIFO evaluation and treatment?
+
The first step is scheduling a comprehensive consultation where we'll:
- Review your symptoms, medical history, and potential contributing factors in detail
- Determine the most appropriate testing strategy for your specific case
- Develop a personalized SIFO resolution plan based on your individual needs, underlying causes, and immune status
Contact our office to schedule your initial consultation and begin your journey toward complete SIFO resolution and optimal gut microbiome balance.
Reviews
The body remembers when it's finally heard
“
Dr. Shustina goes to the root level of the issue, not only superficial, so there's healing.
LG
Leah Glickman
“
She has significantly improved my health. I was suffering from Ulcerative Colitis and now live normally.
ML
Monica LaBadia
“
Dr. Shustina has helped me change my lifestyle and heal my gut in a way I thought impossible.
DL
Dalit Lonstein
“
She listens to patients and treats conditions, not symptoms.
GS
Gabriela Salazar
“
Dr. Shustina is the best doctor I have ever been to. She assesses the root of the problem.
MS
M. S.
“
She is an outstanding doctor who understands the body's ability to heal itself and holistic remedies.
SS
Sibel Sebi Sharabi
“
Dr. Shustina has a wealth of knowledge and is helping me heal years of gastrointestinal issues.
DC
Daniela Chaparro
“
Dr. Shustina is an amazing doctor. She diagnosed my cancer early and saved my life.
MW
Mordechai Weinstein
“
After one session with Dr. Shustina, my digestive pain went away.
TP
Taryn Parascand
“
Doctor Shustina is the absolute best. She has helped me resolve numerous issues other doctors dismissed.
RS
Rachel S.
“
Dr. Shustina is a fantastic doctor who truly cares. Her holistic approach attacks the root cause.
CS
Clay Simonsen
Begin
Your first consultation begins with a conversation
Ninety minutes. Your full history, a review of your medical records, and the plan forward. New patients are welcomed at our Miami Beach office on Lincoln Road and via telehealth in Florida, New York, and New Jersey.
Schedule your consultation