The FoodMarble Protocol: Unlimited SIBO Breath Testing in the Comfort of Your Home

At Tree of Light Health, we have been using the FoodMarble breath-testing device with many of our patients over the years — and we have seen it make a real difference. For those living with SIBO (small intestinal bacterial overgrowth) and the bloating, gas, constipation, diarrhea, reflux, brain fog, and post-meal fatigue that so often come with it, FoodMarble has become one of the most practical tools in our toolkit.

This article explains what the device is, why we love it, how much it saves you compared to traditional testing, and the exact protocol we ask our patients to follow. If you are dealing with SIBO or SIBO-related symptoms, this may be one of the most useful things you do for your gut this year.

What Is FoodMarble?

FoodMarble is a small, handheld breath-testing device that pairs with a free smartphone app. When you breathe into it, it measures two digestive gases — hydrogen and methane — on your breath.

These gases are produced when bacteria in your digestive tract ferment carbohydrates and other foods. When fermentation is excessive, or happening in the wrong place (such as the small intestine, as in SIBO), hydrogen and methane levels climb. Elevated levels are often associated with:

• Bloating and visible abdominal distension
• Gas and belching
• Constipation (often linked to methane)
• Diarrhea (often linked to hydrogen)
• Abdominal discomfort and cramping
• Food sensitivities
• Reflux
• Brain fog
• Fatigue after meals

The goal of FoodMarble is simple: to help us understand how your digestive system responds to food in real life, not just in a single lab snapshot.

A Word on the “Gold Standard” for SIBO Testing

It is worth being honest about how SIBO is typically tested, because it explains why we lean on FoodMarble so heavily.

Technically, the most direct way to assess bacterial overgrowth in the small intestine would be to sample fluid directly during an upper GI endoscopy. In practice, almost no one does this for routine SIBO evaluation — it is invasive, expensive, and impractical for ongoing monitoring.

That leaves the standard clinical breath test as the next-best, widely used option. It is helpful, and it has its place — but in our experience it comes with a real limitation: a lot of false negatives. A patient with clear SIBO symptoms can complete a single timed breath test on one particular morning and have it come back “normal,” simply because that one snapshot missed the pattern.

Why We Use It: An Unlimited Supply of Breath Tests

Here is the part that genuinely excites us.

A traditional SIBO breath test is performed once, over the course of several hours, in a clinical setting. You drink a sugar solution, breathe into a series of collection tubes on a timer, and the lab gives you one result. It is a useful snapshot — but it is just that: a single moment in time. And it typically costs $300 to $400 out of pocket, often more.

FoodMarble flips that model on its head. Instead of one test, you get to test over and over again — before meals, after meals, when symptoms hit, after trying a new food — for as long as you own the device. You can think of it as running an essentially unlimited number of SIBO breath tests from your own kitchen table.

Real-Time Results — We Can See Your Breath Tests as They Happen

This is what sets our FoodMarble program apart. Through our practitioner dashboard, we can review your breath data remotely. When you blow into the device, the readings flow into the app — and we can see, in essentially real time, whether you are producing too much hydrogen or too much methane.

That means instead of guessing, we can watch your fermentation patterns evolve as you eat your normal meals and move through treatment. If a particular food sends your hydrogen soaring, we will see it. If methane is staying stubbornly high and tracking with your constipation, we will see that too — and we can adjust your plan accordingly.

See It In Action

This short video walks through how the FoodMarble device works and what it looks like to use day to day.

Prefer to open it directly? Watch on YouTube here.

Why Consistency Matters

One of the most important parts of using FoodMarble is consistency. We ask that you use the device regularly for at least 14 days so we can monitor trends over time, rather than relying on isolated readings.

The breath numbers alone are not the full picture. The most valuable information comes from combining your breath readings, your meals, your symptoms, your bowel patterns, and your day-to-day changes. Together, these tell us how your digestive system is truly functioning — and whether a given food or treatment is helping or hurting.

The Tree of Light Health FoodMarble Protocol

Step 1: Set Up Your Device

1. Fully charge the FoodMarble device (it charges via USB-C).
2. Download the FoodMarble app from the Apple App Store or Google Play Store.
3. Open the app and create an account or sign in.
4. Turn on Bluetooth on your phone.
5. Follow the in-app instructions to pair your device.

Step 2: Begin Daily Breath Testing

Once your device arrives, begin using it consistently for the next 14 days. This is one of the most important parts of the process — it is what allows us to monitor trends and understand your digestive patterns.

How to perform a breath test:

1. Open the FoodMarble app.
2. Select “Take a Breath Test.”
3. Exhale naturally.
4. Take a deep breath in.
5. Hold briefly.
6. Blow gently and steadily into the device until the countdown finishes.
7. Your readings save automatically in the app.

A note on device care: try not to take more than 10 breath tests in 24 hours, as excessive testing can wear on the sensors. Keep the device away from smoke and silicone-containing products (lotions, hair and beauty products), which can interfere with readings.

Step 3: When to Test

You may choose to take readings:

• First thing in the morning (your baseline)
• Before meals
• After meals
• When symptoms occur
• After eating foods you suspect may be triggers

Consistency is more important than perfection. Regular readings help us identify patterns over time.

Step 4: Log Your Meals & Symptoms

Please use the app to track:

• Meals and snacks
• Bloating, gas, abdominal discomfort
• Constipation or diarrhea
• Reflux
• Fatigue after meals and brain fog
• Any foods you suspect may trigger symptoms

This context is what allows us to interpret your breath data accurately and make better treatment decisions. For example, if you eat a high-FODMAP food and later see a rise in hydrogen or methane alongside bloating, we can begin to connect the dots.

Lactulose vs. Fructose Testing — and Why We May Need Your Pharmacy Info

During breath testing, a measured “substrate” (a test sugar) is sometimes used to challenge the system. The two most common are lactulose and fructose.

Lactulose

Lactulose is the substrate we most commonly prefer for evaluating SIBO and intestinal methane overgrowth patterns.

Because lactulose requires a prescription, if we plan to use it for your testing we will need to send a prescription to your pharmacy. Please send us your:

• Pharmacy name
• Pharmacy address
• Pharmacy phone number

Once we have that information, we can call in your lactulose so it is ready when you need it.

Practitioner Review & Follow-Up

Your FoodMarble data may begin appearing on our practitioner dashboard after about one week of consistent use. Once you have completed your 14 days, send us a message so we can review everything together and discuss next steps.

When we review your data, we look for patterns such as:

• Elevated baseline hydrogen
• Elevated baseline methane
• Hydrogen spikes after certain foods
• Methane patterns associated with constipation
• Delayed fermentation patterns
• Improvement over time with treatment or dietary changes

This lets us make decisions based on real-time information rather than guesswork — and to tailor your terrain-based care plan to what your gut is actually doing.

How to Get Started: We Order It For You

Here is the one requirement: the FoodMarble device used in our clinical program is ordered through the practitioner, and we are happy to take care of that for you. To participate, you do need to be an established patient of Tree of Light Health, so that we can review your data, manage your prescriptions, and integrate the results into your care.

If you are dealing with SIBO or SIBO-related symptoms — bloating, gas, constipation, diarrhea, reflux, brain fog, or that heavy post-meal fatigue — please reach out to us. We will walk you through getting your device, setting up the app, and (if needed) getting your lactulose ordered to your pharmacy.

This article is for educational purposes and does not constitute medical advice. FoodMarble AIRE 2 is a wellness device and is not a substitute for diagnosis or treatment by a qualified healthcare provider. SIBO and related conditions should be evaluated and managed in partnership with your provider. Device pricing referenced (approximately $269–$299) and standard clinical breath test pricing (approximately $300–$400) are estimates current as of 2026 and may vary. FoodMarble® and AIRE™ are trademarks of FoodMarble Digestive Health Ltd.; Tree of Light Health is not affiliated with or endorsed by FoodMarble. Always consult Martin Van Lear, APRN, MSN, ABAAHP, FNP-C or your healthcare provider regarding your individual situation.