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Weight Loss

Your Gut and Your Weight Are More Connected Than You Think

By Sarah Mirkin, RDN · April 3, 2026

One of the most common things I hear from new clients is some version of this: "I'm doing everything right and I still can't lose weight." They're eating well. They're exercising. They're tracking. And the scale is not moving — or it's going in the wrong direction.

Here's what nobody has told them: if your gut isn't healthy, losing weight is genuinely an uphill battle. Not because of effort or discipline — but because of what's happening in their body that they can't see.

This is the connection I've spent 25 years making — and it changes everything when people finally understand it.

Your gut affects your metabolism.

When you have SIBO, IBS, or chronic gut dysfunction, your body is dealing with ongoing inflammation. And that inflammation doesn't stay in your gut — it affects your entire system, including how well your body regulates blood sugar and burns fat efficiently.

Insulin resistance — which makes it harder for your body to use food as fuel and easier to store it as fat — is closely tied to systemic inflammation. I've had clients who were completely metabolically stuck for years. Once we addressed what was happening in their gut, things finally started to move.

You may not be absorbing what you're eating.

This one genuinely surprises people. When your gut isn't functioning properly, you can eat a beautifully nutritious diet and still come up short on key nutrients — B vitamins, iron, magnesium. These deficiencies drag your energy down and slow your metabolism. You feel exhausted and unmotivated, and it's not laziness. Your body is running on empty.

Bloating is hiding your progress.

I've had so many clients come to me convinced they weren't making any progress — when in reality, severe chronic bloating was masking real fat loss. Bloating can add inches to your waistline and several pounds to the scale from fluid retention alone. When we resolve the gut issue, it's often the first time a client can actually see what their body is doing. That moment is genuinely powerful.

Your gut controls your hunger hormones.

Your gut produces ghrelin and leptin — the hormones that regulate hunger and fullness. When your digestive system is dysregulated, these hormones get thrown off. You feel hungrier than you should. You don't feel satisfied when you eat. Cravings intensify. No amount of willpower fixes a hormonal problem.

This is why I never blame clients for struggling with overeating or cravings. If your gut hormones are out of balance, your body is working against you.

Why I address both together.

Trying to lose weight with untreated SIBO or chronic gut dysfunction is like trying to fill a leaky bucket. You put in enormous effort and see very little return.

When we address the gut alongside the weight loss work — sometimes the gut comes first — everything gets easier. Inflammation comes down. Nutrient absorption improves. Bloating resolves so you can finally see your progress. Hunger hormones rebalance so you're not fighting cravings all day.

I've watched this happen with client after client. Someone walks in after years of failed diets, we identify that their gut has been undermining everything, we fix it — and the weight starts moving in a way it never did before.

This isn't a gimmick. It's just treating the whole person instead of one symptom at a time.

If you've tried everything and nothing has worked — there's likely a reason. And there's a path forward.

About the Author

Sarah Mirkin, RDN, CPT, LD is a Monash-certified dietitian specializing in IBS, SIBO, and sustainable weight loss. With over 25 years of experience, she helps clients find lasting relief through evidence-based nutrition.

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