Dr. John Gannage, MD

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Dr. John Gannage, MD

Dr. John Gannage is a Leader in Integrative Medicine to Restore Health and Prevent Disease

MARKHAM INTEGRATIVE MEDICINE is a clinic specializing in Integrative Medicine (integrating conventional and complementary/functional medicine) located in the City of Markham’s heritage district. DR. JOHN GANNAGE, MD is a leading provider of Integrative Medicine, offering health services as a licensed medical doctor to the Greater Toronto Area since 1992.

12/26/2025

In functional medicine, we don’t stop at the diagnosis. We ask why the bloating. Why the brain fog. Why the anxiety, fatigue, pain, or cognitive changes.

A label like IBS, eczema, chronic fatigue, autism, or any other diagnosis tells us what you’re experiencing. It doesn’t explain the contributors that are driving it. Chronic symptoms almost always come from a negative synergy. Too many stressors at once. Too much inflammation, toxicity, immune activation. Not enough nutrients, hormonal support, or metabolic resilience.

The work is identifying those contributors and shifting the balance. Reducing what overwhelms the system. Restoring what’s missing. Supporting the way your immune, nervous, hormonal, and detox pathways communicate with each other every moment of the day.

That’s why functional medicine doesn’t chase a single mechanism or organ. It looks at the whole pattern. When you change the pattern, regulation follows.

If you’re ready to move beyond the label and understand what’s actually driving your symptoms, comment FUNCTION.

12/24/2025

Merry Christmas from all of us at Markham Integrative Medicine!

This season is a reminder to slow down, breathe a little deeper, and be present with the people and moments that matter most. Health is not just about what we do for our bodies, but how we allow ourselves to rest, connect, and enjoy life.

Wishing you peace, warmth, and a holiday filled with meaning as we close out the year together.

12/23/2025

Cadmium is a toxic metal most people don’t think about, yet it can show up in everyday foods like dark chocolate because plants absorb metals from the soil.

What matters most isn’t fear, it’s resilience. When the body is low in key nutrients like iron, zinc, and protein, toxic metals are absorbed more easily and cause more damage. When nutrient stores are supported, the body is better equipped to buffer oxidative stress.

This is why functional and naturopathic medicine focuses on nourishment first. Adequate protein, a wide range of colorful plant foods, and targeted nutrients like zinc, selenium, vitamin C, glutathione, or NAC help reduce the impact of metals like cadmium, lead, and mercury.

Balance changes how the body responds to exposure.
If you’re wondering whether toxic metals could be part of your health picture, comment METALS to learn more.

12/19/2025

If you feel like your body is constantly “on edge,” there’s usually a reason. A dysregulated nervous system doesn’t just show up as stress — it shows up as gut issues, sleep disruptions, mood swings, inflammation, and a brain that can’t quite settle.

In functional medicine, we don’t write these symptoms off as “just anxiety.” We look at the deeper drivers: chronic inflammation, unresolved stress, blood sugar swings, hidden infections, mold, nutrient depletion, hormonal shifts, and mast cell activation. When the system is overwhelmed, the nervous system becomes reactive instead of resilient.

The good news? Once you identify the triggers and support the pathways that regulate the stress response, the body recalibrates. Calm becomes possible again.

If you’re ready to explore WHY your system feels dysregulated instead of just managing the symptoms, comment NERVOUS SYSTEM to book an appointment.

12/17/2025

In almost every complex case I see, healing comes down to two questions. What’s inside your body that shouldn’t be there? And what’s missing that your system needs to function properly? Mold toxins, pesticides, metals, food reactions, microbiome disturbances, these are exposures that can accumulate quietly over years. Low nutrients, hormonal imbalances, and metabolic depletion add another layer.

When the equation tilts toward too much toxicity and not enough support, the immune system becomes dysregulated and mast cells react. Symptoms finally have a root.

My job is to identify what needs to be removed and what needs to be restored so your body can regulate again. If you’re ready for a deeper investigation instead of another short-term fix, comment REMOVE + REPLENISH.

12/16/2025

During the holidays, your gut can easily get thrown off by a few common but powerful triggers. Gluten overload, sugar surges, alcohol on an empty stomach, dairy indulgences, and stress eating can quietly add up, leaving you bloated, fatigued, or dealing with reflux.

When your system is constantly challenged by these seasonal stressors, digestion slows, inflammation rises, and energy dips. Symptoms finally have a root.

I’m here to help you recognize the triggers and give your gut the support it needs so you can enjoy the holidays without paying the price. If you’re ready to protect your gut this season, comment GUT HEALTH to book an appointment.

12/15/2025

You can’t fix your skin by only treating your skin and that’s something we see every day in functional and naturopathic medicine. Acne, eczema, rosacea, and even premature aging often begin with imbalances in the gut. When the microbiome is disrupted or the gut barrier becomes leaky, your immune system reacts, hormones shift, inflammation rises, and the results show up on your face.

Instead of chasing temporary relief with creams or medications, we focus on rebuilding the system from within.

Restoring the microbiome with probiotics and prebiotics, using anti-inflammatory foods and botanicals, supporting nutrient needs like zinc and omega-3s, and addressing stress, sleep, movement, and environmental triggers all help repair the gut–skin connection and strengthen the skin barrier from inside out.

When you heal the internal ecosystem, your skin follows, which means fewer breakouts, less redness, and a healthier glow that lasts.

If you want a tailored plan that addresses your skin concerns at the root, comment GUT SKIN.

12/12/2025

After decades in this field, functional medicine still means the same thing to me: A commitment to seeing the whole human, not isolated symptoms.

It means digging deeper when the labs “look normal.” It means recognizing how the environment, metabolism, stress, immunity, and genetics interact. It means creating plans that actually make sense, biologically, clinically, and practically.

This approach isn't an alternative. It’s simply thorough. And when you understand the full picture, real healing becomes possible.

Comment FUNCTIONAL if you want to learn what a root-cause review looks like in practice.

12/10/2025

After 30 years in functional medicine, here’s what still surprises people the most:

Mold toxicity can look like anxiety, fatigue, brain fog, or even ADHD. Most people with chronic fatigue are actually dealing with mitochondrial dysfunction that’s been overlooked for years. MCAS isn’t rare, it’s just rarely recognized. And the most effective treatment plans only come together when you look at everything at once, not one symptom at a time.

This is why root-cause medicine matters. When you zoom out, the patterns finally make sense and the path forward becomes clear.

If you want a comprehensive, root-cause review and not a quick label or a guess, comment ROOT CAUSE and book an appointment.

12/09/2025

Holiday travel takes a lot out of your body. Dehydration, poor cabin air, disrupted sleep, and immune stress all add up fast.

IV therapy helps you stay hydrated, energized, and resilient so you can actually enjoy the trip instead of recovering from it.

Whether you're flying home or headed somewhere new, supporting your system makes all the difference this time of year.

Comment JET LAG to learn which IV formula best fits your travel plans.

12/08/2025

Most people are eating the bare minimum of protein and your body feels it. Protein isn’t just for muscle. It’s what your liver uses for detoxification, what your tissues use for repair, and what protects your metabolism as you age.

When you don’t get enough (or the quality is poor), your body starts breaking down muscle to make up the difference. Clean, adequate protein changes everything: strength, energy, detox, and long-term health.

Comment PROTEIN to learn what optimal intake actually looks like.

12/04/2025

Men’s hormonal health goes far beyond a single testosterone number.

Fatigue, low drive, stubborn belly fat and brain fog are often signs that stress, sleep, movement and metabolic health are out of sync. Cortisol surges can block testosterone production, poor sleep can disrupt the signals that create it, and inactivity tells the body to downshift rather than thrive.

In functional medicine, the goal is not to mask the problem but to restore balance. Strength training, targeted nutrition, stress regulation, proper sleep and strategic lifestyle tools can help reactivate your body’s natural hormone rhythms so energy, mood and vitality return from the inside out.

Comment HORMONES to learn how to support men’s hormonal health at the root.

Address

300 Main Street Markham N
Markham, ON
L3P1Y8

Website

http://www.integrative-medicine.ca/

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