You might know the feeling: you lie in bed for eight hours and still wake up exhausted. Your body slept, but didn't truly recover. But what’s behind it?
If you wear a Garmin smartwatch or an Oura Ring, or use Apple Health, you can connect your device directly to Hello Inside. Hello Inside then overlays your wearable data with your glucose, making connections visible that would otherwise remain hidden. Here’s what that looks like in practice.
Glucose is a signal. Your body sends many.
Glucose tells you a lot, but it never tells you the whole story.
The same meal can have completely different effects—depending on how you slept the night before, how much your nervous system is currently carrying, where you are in your cycle, or how your body handled yesterday's workout. Without this context, you're trying to understand a pattern with only half the picture.
By connecting Oura, Garmin Connect, or Apple Health, Hello Inside can overlay your biometric data with your glucose and make the connections visible that your body has been making all along.
What is synced and why it matters
Sleep (Oura Ring, Garmin Smartwatch, Apple Health)
While you sleep, a lot happens in your body. One of the most important things: it restores insulin sensitivity, which is the ability of your cells to respond to glucose. When sleep is disrupted, especially deep sleep (slow-wave sleep), this process is interrupted. Research shows that this can decrease insulin sensitivity the next day, even if your sleep duration looks fine on paper.
In everyday life, it can look like this: you wake up already at a disadvantage. A glucose reading that rises faster than usual. A craving for something quick and sweet before 10 AM that feels like it came out of nowhere. This isn't a question of discipline. This is what a difficult night looks like metabolically.
Hello Inside overlays your wearable's sleep data—deep sleep, REM sleep, sleep score—with your glucose over time so these connections stop being invisible.
The Oura Ring goes one step further: it also measures body temperature. Even the smallest fluctuations can provide early indications of hormonal changes—especially relevant for women throughout their cycle and during the transition to menopause.
Stress, HRV, and why your glucose levels sometimes rise for no apparent reason
Heart Rate Variability (HRV) is one of the most honest signals from your nervous system. When your HRV drops, your body is under strain—from a stressful day, incomplete recovery, hormonal shifts, or simply more than your system can quietly absorb.
Under stress, your body releases cortisol. Cortisol increases blood sugar. This is the cortisol-glucose response—completely normal, and entirely capable of creating a spike that has nothing to do with what you ate.
With Garmin's Body Battery and stress tracking data (or Oura's HRV readiness score) connected to Hello Inside, this spike finally gets context. You stop looking for a dietary explanation and start seeing the more complete picture: what your nervous system was doing at the time and how your glucose reacted to it.
Activity and the cycle effect
Exercise is one of the most effective tools for supporting metabolic health. But its impact on glucose is anything but predictable, and for women, the cycle phase changes everything.
In the follicular phase, estrogen supports insulin sensitivity. Your body generally tolerates higher intensities well, recovers efficiently, and your glucose often responds positively to a challenging workout. In the luteal phase, progesterone shifts the picture. The same session can trigger a more pronounced cortisol-glucose response and require more recovery time than it did two weeks earlier.
When workout data is synced via Garmin Connect or Apple Health, Hello Inside can track these patterns over multiple cycles. This allows you to see what your body might have been trying to tell you all along and helps you work with it more effectively.
Cycle tracking (Garmin Smartwatch)
If you already track your cycle on your Garmin smartwatch, this data also flows into Hello Inside—your current phase, cycle day, and length, whether your cycle is regular or not, and even during the transition to menopause.
Your metabolic needs shift throughout your cycle in ways that are real and measurable. Insulin sensitivity, sleep quality, energy, and recovery capacity—all of this moves with your hormones. Cycle phase isn't just context for period tracking. It's context for almost everything your body is doing right now. And when you know which phase you're in, you can read your sleep data correctly.
How to connect your wearable
Open the Hello Inside app → App Settings → connect Oura, Garmin Connect, or Apple Health.
From then on, your data will flow in automatically. No extra steps—just keep wearing what you’re already wearing and let Hello Inside make more of it.
No wearable? Your body is still speaking.
You don't need a wearable to use Hello Inside. The foundation is your glucose data and what you log—and that alone gives you more insight into your metabolism than most people ever have.
But if you want more biometric signals without buying a new device, there are two ways.
The Face Scan. Integrated directly into the app, it uses your smartphone's front camera for a 30-second measurement—no additional device required. It captures signals like HRV and energy balance—in simple terms, how recovered or exhausted your nervous system currently is—and both are directly related to how your body processes glucose and stress throughout the day. It's best to do it right after waking up, while still in bed, before your first coffee. Over time, it creates a personal baseline that Hello Inside uses to add another layer of meaning to everything else you track. Learn more about how the Face Scan works →
Manual logging. Sleep quality, stress, energy, symptoms—all of this can be entered directly into the app. Less automated than a wearable, but still meaningful. Patterns that appear over days or weeks often say more than a single data point.
The big picture
Your body has been talking to you the whole time, through your energy, your sleep, your cravings, and your recovery. Your wearable has been recording parts of this conversation. Hello Inside brings it all together.
Glucose, sleep, stress, activity, cycle—all in one place, all aimed at the same goal: a clearer picture of what your metabolism is doing and why. You have data and connections that you can finally read and act upon purposefully for your health.
Your body provides the feedback and Hello Inside helps you understand it.
Frequently Asked Questions
Does Hello Inside work with Garmin smartwatches? Yes. Hello Inside integrates with Garmin Connect and syncs sleep data, HRV, stress, Body Battery, activity, and cycle phase. Connect via the app settings in the Hello Inside app.
Does Hello Inside work with the Oura Ring? Yes. Oura Ring data—including sleep stages, HRV, body temperature, and readiness score—can be synced with Hello Inside via the app settings.
Does Hello Inside connect to Apple Health? Yes. If you use Apple Health to aggregate data from your iPhone or other devices, Hello Inside can pull activity, sleep, and other metrics from it via the app settings.
Do I need a wearable for Hello Inside? No. Hello Inside works without a wearable. The core experience is based on your CGM glucose data and what you log in the app. The integrated Face Scan also allows you to measure HRV and other biomarkers using only your smartphone camera—no extra device needed.
What data does Hello Inside use from my wearable? Hello Inside uses sleep quality (deep sleep, REM, total sleep duration), HRV, stress levels, Body Battery (Garmin), activity and workout data, and cycle phase data (Garmin). This data is overlaid with your glucose levels to generate personalized daily insights.
Why does my HRV affect my blood sugar? HRV measures how recovered your nervous system is. A low HRV signals physiological stress, which triggers the release of cortisol. Cortisol increases blood sugar—meaning a stressful or poorly recovered day can cause glucose spikes, without any changes in your diet.
Note: This information does not replace medical advice. If you have any existing health conditions or are taking medication, please speak with your doctor.
