BLOATING, IBS, AND GUT ISSUES? IT MIGHT BE YOUR BLOOD SUGAR

You’re bloated, uncomfortable, have sugar cravings, carbs cravings, and maybe dealing with IBS, reflux, or even SIBO.

Naturally, everyone focuses on gut testing, probiotics, and elimination diets.

But what if part of your gut symptoms are actually being driven by something more upstream — your blood sugar?

Yep. Your glucose swings from skipping meals, having smoothies for breakfast, eating too many processed carbs or sugary drinks might be directly messing with your digestion. 

Let’s break down how blood sugar regulation ties into your gut — and why you can’t fully heal your gut if your blood sugar is dysregulated.

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HOW BLOOD SUGAR AFFECTS YOUR GUT:

✅ Motility slows down

When your blood sugar is constantly spiking and crashing, it puts stress on your nervous system — especially something called the vagus nerve. The vagus nerve controls your “rest and digest” mode — it tells your gut when it’s safe to move food through, release enzymes, and absorb nutrients.

When blood sugar swings throw it off, your gut doesn’t get the proper signals to do its job. Food sits longer, digestion slows down, and this creates the perfect setup for bloating, constipation, gas, and even bacterial overgrowth (SIBO). Basically, the whole system gets sluggish and backed up.

✅ Feeds dysbiosis

Frequent spikes from high-carb or high-sugar meals provide constant fuel for the wrong bacteria to thrive. They love the sugar just as much as you do! Dysbiosis thrives on unstable blood sugar swings and creates a vicious cycle where you crave even more carbs and sugary foods — which just feeds the imbalance further.

✅ Increases gut permeability (leaky gut)

Blood sugar dysregulation increases inflammation, which damages the tight junctions in your gut lining — the barrier that normally keeps food particles, toxins, and bacteria out of your bloodstream. When these junctions become loose and inflamed, those particles start to “leak” into your blood, triggering an immune response. This gut permeability is believed to be a major root cause behind many autoimmune conditions.

✅ Stress on your liver and gallbladder

When insulin and glucose stay consistently high (snacking, high sugar or carby foods, stress) your liver has to work overtime to process the extra sugar and insulin. 

Over time, this can congest bile flow, which slows down digestion and fat metabolism. That’s why you might experience nausea, trouble digesting fatty foods, floating stools, or gallbladder issues.

It also puts extra strain on how your body processes cholesterol. When blood sugar is dysregulated, the liver gets stuck in a state of making more cholesterol (especially triglycerides and LDL), while also becoming less efficient at clearing it. 

❗️So while high cholesterol often gets blamed purely on diet or genetics, for many people, it’s actually a downstream effect of blood sugar dysfunction and inflammation driving the liver out of balance. 🤯

✅ Elevates cortisol, which impacts digestion

Every blood sugar spike leads to a crash, which triggers a cortisol response. While cortisol is helpful in short bursts, chronically elevated cortisol shifts you into “fight or flight” instead of “rest and digest.” This suppresses stomach acid production and gut repair, making reflux, bloating, indigestion, and nutrient malabsorption worse.

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WHY THIS GETS MISSED:

Most gut protocols focus on killing off bacteria, cutting out foods, and throwing probiotics at the problem — but if blood sugar instability is still happening, you’re not fully addressing one of the biggest drivers behind the gut dysfunction in the first place.

We have to calm the blood sugar swings to stabilize the entire gut environment. 

Otherwise you’re stuck in a cycle of:

Eat → spike → crash → crave → bloat → repeat.

 

👉 This is also why just running a stool test isn’t enough.

A stool test can tell us what bacteria or parasites are present in your gut right now, but it doesn’t tell us why the gut became imbalanced in the first place (spoiler: it’s often from a limited, processed food diet that’s throwing off blood sugar and feeding the wrong bugs).

It won’t show if blood sugar swings are constantly feeding that dysbiosis. It won’t show if your liver is overwhelmed from chronically elevated glucose and insulin. And it won’t catch early metabolic shifts like rising insulin, cholesterol changes, or nutrient deficiencies — all of which directly affect your gut environment.

If we’re only looking at stool testing without also running comprehensive bloodwork (glucose, insulin, A1C, inflammatory markers, liver function, nutrient status), we’re missing a huge part of the puzzle.

When we combine functional bloodwork and CGM (Continuous Glucose Monitor) data, we’re not just looking at what you’re eating — we’re looking at when you’re eating, how your body responds to food, stress, exercise, and how your metabolic health is directly impacting your gut.

👉 This is exactly why I love using CGMs and bloodwork together — it gives us real-time data on how your meals, stress, sleep, and metabolism are truly functioning — and helps us address the upstream root cause, not just manage symptoms.

Then inside my Functional Medicine calls, we go even deeper — looking at your full health history, eating patterns, and lifestyle habits to figure out what’s actually driving your symptoms. The good news? While it may not sound “sexy,” most of the time these issues are highly fixable with daily habit shifts — which means you have a lot more control than you probably realize.

 

HOW YOU CAN START FIXING IT:

• Start your day with protein + fiber (skip the fruit, smoothies, and oatmeal).
  
• Cut out processed carbs (bread, tortillas, grains) that spike your blood sugar and feed the ‘bad’ bacteria 
• Balance carbs with fat and protein at every meal (no naked carbs). That means pairing your carbs with things like avocado, chicken, ground turkey, steak, salmon, eggs, chicken sausage, grass-fed beef, or sugar-free bacon. You can also add fats like olive oil, ghee, nut butters, or tahini. Protein and veggies should take up the majority of your plate to keep blood sugar stable.
• Walk after meals to improve glucose clearance and gut motility.
• Support your liver and bile flow with bitter foods (arugula, dandelion, lemon, beets).
  
• Manage stress — nervous system regulation helps motility and blood sugar. Make 10 minutes of meditation or 3 pages of journaling a much of a non-negotiable as you would brushing your teeth.

Use a CGM to track how your blood sugar responds throughout the day.

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THE BOTTOM LINE:

If you’re working on gut health but not paying attention to blood sugar — you might be missing one of the biggest pieces of the puzzle.

✅ Grab my Mastering Your CGM Guide to learn how to read your glucose patterns
✅ Or book a Functional Blood Sugar Consult to run labs, review your CGM data, and build your full plan.