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So I started wearing an Oura Ring in 2020 and have been using the data since then.
When I started on Mounjaro, I expected the ring to confirm what I was feeling — less appetite, more energy, maybe better sleep as the weight started moving. That's not quite what happened.
The first few weeks, my Readiness scores dropped. Not dramatically, but consistently. Sevens became sixes. A few fives showed up. I'd wake up feeling okay, look at the app, and wonder what the ring knew that I didn't.
Turns out, it probably knew less than I thought. And more than I was giving it credit for.
Here's what I've figured out about reading Oura data — not as instruction, just as one person's experience with one ring on one wrist for going on two years now.
The score is a summary, not a verdict.
Oura rolls sleep, HRV, resting heart rate, body temperature, and respiratory rate into a single Readiness number. That number is useful the way a weather forecast is useful — worth knowing, not worth betting everything on. Some mornings I've scored a 74 and felt sharp all day. Some mornings I've hit 85 and still needed a second cup of coffee before I could hold a thought.
The score tells you something. It doesn't tell you everything.
HRV is the signal I watch most.
Heart rate variability — the variation in time between heartbeats — is the metric Oura leans on hardest for recovery. When mine drops for two or three nights running, something is usually going on. Stress. A harder workout than I logged. A meal that didn't sit right.
On Mounjaro, my HRV has been all over the place. The medication affects your gut, your appetite, your metabolism — and apparently, your autonomic nervous system too, at least for some people. What I expected to be a slow, steady improvement turned into a noisy signal I had to learn to read differently.
I stopped treating a low HRV night as a failure. Started treating it as information.
Body temperature is the quiet one.
Oura tracks skin temperature deviation — how much warmer or cooler you ran compared to your baseline. I didn't pay much attention to it at first. Now I check it when something feels off. Illness shows up here before I feel it. So does a hard stretch of poor sleep. It's a slower signal than HRV, but it's honest.
What the ring got wrong — or at least, what I don't trust.
Sleep stage breakdown. Deep sleep, REM, light sleep — the percentages Oura shows are estimates based on movement and heart rate. They're not EEG readings. I look at them, but I hold them loosely. When the ring tells me I got fourteen minutes of deep sleep, I don't take that as precise. I take it as low.
What I've come to believe, after two years and one medication change and more mornings than I can count staring at that app: the ring is a good witness. It's not an oracle.
It sees patterns I'd miss. It doesn't always know what those patterns mean. Neither do I, most of the time.
That's okay. Watching carefully is still better than not watching at all.
From the Field
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