By Avraham Binder, Certified Health Coach

Changing your lifestyle – especially your diet – is hard. Anyone who’s tried to lose weight, feel better, reverse chronic illness, or avoid medications, switching how and what you eat isn’t just a matter of willpower – it’s also about pure motivation. To be motivated you need information and awareness to bring you to an understanding about why making a change is so important. That’s where a tech device called a Continuous Glucose Monitor, or CGM, can make a huge difference – especially if you’re starting a low-carb or ketogenic (keto) diet.

In this post, I’ll explain what a CGM is, how it works, and why it can be such a powerful tool to help you truly understand how your body responds to food – especially when your goal is to reduce insulin resistance, inflammation, and the risk of chronic diseases like diabetes, heart disease, and even dementia.

What Is a CGM?

A Continuous Glucose Monitor is a small sensor you wear on your body – usually on the back of your arm or your abdomen – that measures the level of glucose (sugar) in your blood, around the clock.

You might think of it as a “health radar” that scans how your body is handling the food you eat throughout the day. It doesn’t require finger pricks like traditional blood glucose meters. Instead, the sensor sits just under your skin and sends data wirelessly to an app on your phone. Every few minutes, it logs your blood sugar levels, giving you a graph you can actually see what’s happening to your blood glucose.

This real-time feedback helps you connect the dots between what you eat and how it manifests in your body.

How the CGM Works: The Science Made Simple

Your body converts the food you eat into glucose – a form of sugar used for energy. Carbohydrates (like bread, pasta, fruit, and sweets) turn into glucose quickly. Protein does too, but at a slower rate. Fat, on the other hand, has little to no effect on blood glucose.

When glucose levels rise in your blood, your pancreas responds by releasing insulin – a hormone that acts like a key, helping glucose move from your bloodstream into your cells, where it can be used for energy.

This is completely normal and healthy, but only in small doses. But when your glucose spikes too high, too often (like from eating ultra-processed carbs or sugary snacks all day), your body has to produce more and more insulin to keep up. Over time, your cells stop responding well to insulin. This is called insulin resistance.

Why Glucose Spikes and Insulin Resistance Matter

When your body becomes insulin resistant, your blood sugar stays high longer, your insulin stays high longer, and your cells stop listening to both. Think of it like someone knocking at your door all day long – you start tuning it out.

And that’s where the problems begin. Chronic insulin resistance leads to:

• Type 2 Diabetes – where your body can no longer control blood sugar without medication.
• Weight gain – especially around the belly.
• Systemic inflammation – a silent fire in the body that can damage tissues and organs.
• Heart disease – high insulin levels promote high blood pressure, artery damage, and cholesterol issues.
• Cognitive decline – some researchers call Alzheimer’s “Type 3 diabetes” because of its link to insulin resistance in the brain.
• Increased cancer risk – due to excess insulin and inflammation encouraging abnormal cell growth.

All of this may sound overwhelming, but here’s the hopeful truth: insulin resistance is largely reversible – especially through dietary and lifestyle changes.

Starting Keto: Why CGM Can Help

The ketogenic diet – very low in carbs and high in fats – is one of the most powerful dietary tools for lowering insulin and reversing insulin resistance. But here’s the catch: everyone’s body is different, and so are their glucose responses to foods.

Some people can eat a banana and have a small glucose bump. Others experience a major spike. One person might tolerate carrots or Greek yogurt; another might see their glucose shoot up.

This is where a CGM becomes your secret weapon.

Imagine this: You’re three days into your keto journey. You eat a “keto-friendly” protein bar. Thirty minutes later, your CGM shows your glucose jumped 40 points. You just learned something valuable: that bar is not as friendly to your body as it claimed to be.

That kind of visual, personal feedback is more powerful than any food label.

CGM and the Motivation to Keep Going

Let’s face it, change is tough. It’s hard to give up old habits, especially ones that bring comfort or convenience. But when you can see with your own eyes how that breakfast sandwich, sweetened yogurt, or even that “healthy” smoothie sends your blood sugar soaring, it becomes much easier to say no the next time.

On the flip side, when you try a low-carb meal, like eggs, cheese, and avocado and your CGM shows a calm, steady glucose line, you start to understand what works for your body. That’s a win. And seeing those wins builds momentum.

This kind of data builds awareness, confidence, and motivation. It’s not about guilt or shame, it’s about knowledge and empowerment.

Real-Life Examples

Here are a few scenarios I’ve seen with clients using CGMs:

• Chaim, who thought oatmeal was a healthy breakfast, saw his glucose shoot up to 180 mg/dL. He switched to eggs and spinach and stayed around 95 mg/dL. The difference in energy and cravings was immediate.
• Rachel, a new keto dieter, learned that her favorite low-carb tortilla actually caused more of a spike than a slice of sourdough bread! She swapped it out for lettuce wraps.
• Yehuda, a former soda drinker, saw how even diet sodas (with certain sweeteners) caused unexpected glucose responses. Cutting them out helped reduce his cravings altogether.

The Bigger Picture: From Data to Transformation

Using a CGM isn’t just about numbers—it’s about seeing your biology in action and making smarter, personalized choices based on it.

With this tool, your body stops being a mystery. Instead of guessing what’s good for you, you’ll know.

It can also help you identify other key health factors—like stress (which raises glucose), poor sleep, or even intense workouts. Everything you do affects your blood sugar, and CGM gives you a front-row seat to that show.

Final Thoughts

A CGM isn’t magic. It won’t do the work for you. But it will show you what’s going on under the hood – something most of us never get to see. For anyone starting keto or trying to reverse insulin resistance, this kind of real-time feedback is priceless.

If you’re trying to change your health, manage your weight, or avoid chronic disease, I highly encourage you to consider using a CGM – at least for a couple of weeks. What you learn could be the key to lasting transformation.

During my coaching sessions, I discuss the use of CGMs with my clients and encourage them to get one, especially for the beginning of their health journey.  If you’re curious or ready to try, reach out to me, I can help guide you through the process and show you how to make the most of it.

Your body is talking. It’s time to listen. All you need is a listening device.

Disclaimer: This guide provides general information and is not a substitute for medical advice. Always consult with healthcare providers before making significant changes to your diet or exercise routine, especially if you have existing health conditions or take medications.